Whitespace is the term used in Tcl to describe blanks, tabs, newline characters, and comments. In addition, semicolons can be used to separate multiple statements on a single line. Syntax: set fp [open existing_file_name r] Example: we can read a file line by line in a variable like this. Tcl uses the backward slash to indicate the end of a line in a command that spans multiple lines. Example: Tcl script with command-line parameters « ipSpace ... I want to put the whole procedure into a single comment, I don't want to have to put # before each line. This is the way i'm doing it: proc longcomment {} {} longcomment{ This is a long comment, which may span multiple lines. The Tcl interpreter reads the line from left to right, and evaluates each word . Below is an example of a tcl script that interacts with tkmedit: /***** *** This Is a Comment. => comp lang tcl announce. PDF Vivado Design Suite Tcl Command Reference Guide The following example uses a multi-line comment as an explanation: Example /*Select all the columns of all the records in the Customers table:*/ SELECT * FROM Customers; sed - How to comment a line based on the word it starts ... tcl, Multi-line comments (question) proc creates a Tcl command in the global namespace ; procname is any string ; arglist is a proper list of formal parameter names; see below ; body is a Tcl script. sh processes the script first; it treats the second line as a comment and executes the third line. Expect is an extention to the Tcl scripting language so it uses all of Tcl's syntax. Scripts can be written in one of two formats: A sequence of FortiGate CLI commands, as you would type them at the command line. Why is Tcl syntax so weird (2013) | Hacker News The first command turn multiline output into an array, the second command expand array into multiple arguments on one line. TCL TK Tutorial: Tool Command Language router# tclsh flash:cimccfg.tcl. Tcl SNMP MIB Access Tcl is a dynamic scripting language that extends the functionality of CLI scripting. If the file doesn't exist, create a new empty file. Simple shebangs can help with scripting, e.g., #!/usr/bin/env python at the top of a Python script will allow it to be run in a terminal as "./script.py". # This is a comment ending at the end of the line You can split a line by introducing a \ just before the newline (no trailing space): # This is a comment ending \ at the end of the line For Tcl this is one line only. The Short Answer. It's quirky, but functional. . Tcl - Procedures. However, if we omit the file argument, cat will read input from the standard input. tclsh add.tcl. It describes the basic mechanisms used by the Tcl interpreter: substitution and grouping. The method by which numbers can be passed into, and used by a script, is as follows. Whether you need to automate repetitive behavior, extend the functionality of an application, control multiple tools with a single script or create a custom GUI, Tcl is your best choice. Multi-Line Comment in Shell Script Using the HERE DOCUMENT However, you can use HERE DOCUMENT feature as follows: #!/bin/bash echo "Say Something" <<COMMENT1 your comment 1 comment 2 blah COMMENT1 echo "Do something else" This guide assumes you are familiar . You might notice that the topology looks a bit awkward in nam. A while back I saw some vendors tried to make perl or python an option, but tcl is the de facto language in this space those vendors often abandoned the having multiple scripting interfaces and fell back on tcl. Procedures are nothing but code blocks with series of commands that provide a specific reusable functionality. Actually expect uses majority of the features provided by TCL language. It consists of multiple rules and the following table explains these rules and corresponding use. A comment line starts with the number sign (#). you will see the modification appearing only on the first line IMPORTANT LAST STEP: type Esc key, and there you see the added character appear on all lines Length : 3 days Tcl has become the de facto standard embedded command language for Electronic Design Automation (EDA) applications. LotusScript has two ways to enter comments. 21).You can now start entering Tcl/Tk commands here. # this is a valid comment proc hello { } { # the next comment needs the ; before it to indicate a new command is # being started. set LotusScript . The "regexp" command is used to match a regular expression in Tcl. LotusScript has two ways to enter comments. sh processes the script first; it treats the second line as a comment and executes the third line. Again there should be no white space between delimiter (' '). Procedures are equivalent to the functions used in many programming languages and are made available in Tcl with the help of proc command. We read the file line by line and store the data in a file pointer variable dynamically. Inside the body, we use the gets command to read a line from the file. . eg: router# more flash:cimc.cfg. Tcl command is actually a list of words, with the first word representing the command to be executed. 5 Helpful. For example, we can use the cat command for appending lines to a file. . . The following example uses a multi-line comment as an explanation: Example /*Select all the columns of all the records in the Customers table:*/ SELECT * FROM Customers; You can save and start the script now. I. Tcl Basics 1 Tcl Fundamentals 1 This chapter describes the basic syntax rules for the Tcl scripting language. I picked up the exec habit while writing Tcl scripts meant to run on both FreeBSD and . You can hit the 're-layout' button to make it look better, but it would be nice to have some more control over the layout. The Tcl interpreter counts curly braces inside comments, which can lead to errors that are difficult to track down. Expect scripts are written like many other scripts. the command is invalid because the set command does not terminate until the new line after the comment. Blank lines in the configuration file are ignored. The "regexp" command is used to match a regular expression in Tcl. If you are using Bash, then you can do it without any external tool. This interpretation of the backslash has implications on how you specify full paths in OMB*Plus, as described in "Specifying Paths". These powerful expressions are introduced in more detail in Part Two.Briefly, though, AREs support backreferences, lookahead, non-greedy matching, many escapes, features that are useful for internationalization (handling collation elements, equivalence classes and character classes), and much more. Multi-line comments start with /* and end with */. In batch mode, you can queue up a series of Tcl scripts to process a number of designs overnight through synthesis, simulation, and implementation, and review the results on the following . The exec statement cause the shell to stop processing and instead to start up tclsh to reprocess the entire script. /***** *** This Is a Comment. Some keywords require several lines of data. Hello, I have a SAS code that predominantly has comments line and the real code like below and i want to remove ONLY THE COMMENTS from the code in the single line or spanned across multiple lines. The Tcl interpreter breaks the command line into words and performs command and variable substitutions as needed. append puts one string directly on the end of another, without adding any extra characters beyond those in the incoming variables. Then run our script using the spawn command. A comment consists of a # followed by any number of characters up to the next newline. In Tcl 8.0, binary I/O is fully supported; just make sure the channel is configured for binary mode (see the fconfigure.n man page). Select desired lines and then press CTRL + Q. Any text between /* and */ will be ignored. (4 Replies) Most scripts begin by spawning the process they want to interact with. This makes it possible to use perldoc script.sh. The puts command. It touches lightly on the following Tcl commands: puts, format, set, expr, string, while, incr, and proc. I like the one line composability Example. */ for commenting out lines of code. Hello, I have a SAS code that predominantly has comments line and the real code like below and i want to remove ONLY THE COMMENTS from the code in the single line or spanned across multiple lines. A regular expression is a sequence of characters that contains a search pattern. Many commands in Tcl (including puts) can accept multiple . ' This is a comment. In order to group the words into a single argument, we enclose multiple words with "" or {}. Java libraries, Perl, and Tcl demonstrate the progress of the field of computer science by ignoring these superior systems of decades past. All EDA uses tcl, so no surprise Intel would too. Comments in Lua - Lua example. Normally, we use this command to concatenate files and print their contents to the standard output. Here is how the lines will look like after highlighting them. Any text between /* and */ will be ignored. Items of data passed to a script from the command line are known as arguments. LotusScript . The command has the following syntax: puts ?-nonewline? Learning Objectives The first two days of this course provide a hands-on . (4 Replies) I actually use it with Python since, as you know, the exec trick (well, the exact same trick at least) doesn't work with Python (since a backslash can make a comment to span multiple lines in Tcl, but not in Python). The Cisco IOS Scripting with Tcl feature provides the ability to run Tcl version 8.3.4 commands from the Cisco IOS command-line interface. We can use spawn to run any interactive script or program we want. Extract the list words from a string that is not a well-formed list: Press SHIFT+V to highlight the whole line after the cursor. The other rows that remain are the Expect script that connects to our shell script. Optional Paramaters (Default Values) Many Tcl commands have optional parameters, such as the increment parameter to the incr command. 4. cat. Whitespace in Tcl. The number of command line arguments to a Tcl script is passed as the global variable argc. Lisp systems in the 1970s included elegant ways of returning all possibilities when there were multiple matches for an expression. The script would be more useful if we could pass values to the script from the command line. . Tcl 8.1 also supports advanced regular expressions (AREs). Tcl comments are a # at the beginning of the line, or after the command is closed with a ; semicolon. ?channelId? Like Bash or Perl the binary is called at the top "#!/usr/bin/expect" and the scripts commands below it. Optional parameters have a default value . Of course the output is always the same because the values being added are hard-coded into the script. If you are using Bash, then you can do it without any external tool. I am writing multiple lines to a file in tcl. These primitive data-types in turn create composite data-types for list and associative array. split "comp.lang.tcl.announce" . Although i am successful to write out, but also wanted to have a blank lines after few lines and to add comment for each line. Perl one liner: perl -pe 's/^HOST/#$&/' file Or, to edit the file in place: perl -i -pe 's/^HOST/#$&/' file Explanation. Wherever the single quote (') is used, the rest of the line is treated as a comment and ignored. The exec statement cause the shell to stop processing and instead to start up tclsh to reprocess the entire script. A Tcl command is a string of words, separated by blanks or tabs. The next words represent the arguments. Add the next three lines to your Tcl script and start it again. In a comment to the "Execute multiple commands at once" post, Michal has asked for a complete Tcl-shell-with-parameter example. Remember, this for loop is not similar to bash for loop. Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7. A line containing only whitespace, possibly with a comment, is known as a blank line, and a Tcl interpreter totally ignores it. Open the file plot.tcl in your favorite text editor, and change the first line to be the location of the log file you just created, e.g. In Tcl, data-types can represent not only the simple Tcl objects, but also can represent complex objects such as handles, graphic . Therefore, in a multiple line OMB*Plus command, use only a backslash (\) at the end of each line. I've found the ALT + Left Mouse Click trick to work well with Visual Studio, JetBrain products, Notepad++ but not Eclipse. multi line comment TLDR BTW This is a single line comment. Here goes my code. Share. Set the initial access position to the end of the file. If a hash character (``#'') appears at a point where Tcl is expecting the first character of the first word of a command, then the hash character and the characters that follow it, up through the next newline, are treated as a comment and ignored. Exact match. Procedures The proc Command proc procname arglist body. What is more, it guarantees: 30 days of free revision; A top writer and the best editor; A personal order manager. Its simple and powerful. The name of a Tcl script is passed to the script as the global variable argv0, and the rest of the command line arguments are passed as a list in argv. Here, we are replacing lines starting with HOST (^ means the beginning of the line) with a . Tcl - Regular Expressions. Last line if the end of the file which means is the end of the interaction. Or, to "comment out" a line, add a # character to the start of the line. In FortiManager Tcl scripts, the first line of the script is "#!" as it is for standard Tcl scripts. Here's a short script that shuts down the interface and displays its status: Variable ifname is set to the value of the first command-line parameter (in many other programming languages, this would be written as argv[0]); If the ifname is empty, the script aborts . Also, I've just recently become a fan of ALT + Left Mouse Click to select multiple lines and just manually comment those lines with //. This will toggle comments on and off. In languages that have single-line comments and multiple-line comments, a careful programmer can create her own mega-comment. TCL supports many different types of programming methods. But, unlike the UNIX C-shell, bourne shell, and bash shell, the \ backslash character at the end of a comment line will continue the comment onto the next line. VARIABLES Tclsh sets the following Tcl variables: argc Contains a count of the number of arg arguments (0 if none), not including the name of the script . For example, let's say . Multi-line Comments. Multi-line comments start with /* and end with */. Then use the /* . set log push.log. The covered Tcl commands include the puts, open, gets, flush, incr, info, set, and unset commands.. For 2021 - online Python 3 training - see . Occasionally, a more complex shebang line is needed. Point. For example, some languages do not include the program name in ARGV; a multiline shebang can reorder the arguments so that the program name is included in ARGV. [9] Comments. Comments are prefaced by a # and may appear on the end of a line with actual values: keyword value # This is a comment or may be at the beginning of a line: # This entire line is a comment . There are solutions to our problem that are less obvious. I also want some of the text will be put into a single comment Let's modify our password changing script and include a for loop to address it for multiple users. Tcl also continues scanning when there is an open brace or double-quote. NS-2 can be used to implement network protocols such as TCP and UPD, traffic source behavior such as FTP, Telnet, Web, CBR, and VBR, router queues . tclsh add.tcl 23 15. So, i'm looking for the best way to do multi-line comments. A Tcl script is a series of Tcl commands, separated by new-lines or semicolons. Good day Tobik, The env trick is sure simpler, and it probably works well for most people. - It is used to avoid same code being repeated in multiple locations. string (Note that some languages have different comment formats, so this may not be true if you're working with a source code file.) #Open the file called "jokes.txt" for writing. Multi-line Comments. Multi-line comments would each need a single quote mark. The first command turn multiline output into an array, the second command expand array into multiple arguments on one line. # This is a comment at beginning of a line puts {Hello, World - In Braces} puts {Bad comment syntax . Questions Use: Many times we have to read a report file inside the tcl scripting to make some fixes based on the violation reported. Multi-line comments or paragraphs serve as documentation for others reading your code. To comment lines 2 through 4 of bla.conf: sed -i '2,4 s/^/#/' bla.conf To make the command that you wanted, just put the above into a shell script called comment: #!/bin/sh sed -i "$1"' s/^/#/' "$2" This script is used the same as yours with the exception that the first and last lines are to be separated by a comma rather than a dash. Tcl is a string-based command lan-guage. The -pe means print every input line after applying the script given by -e.The s/foo/bar/ is the replacement operator and will replace the first instance of foo with bar on every line. This sounds confusing, but is typical of in-terpreters (e.g., /bin/sh). The return value of open is a channel identifier that you use in exactly the same way as a file identifier when you've opened a regular file. TCL Command-line arguments. # This is a comment line that ends with a backslash \ and this line is still part of the comment Q.B13- How can I input and output binary data? Tcl scripting commands to provide more functionality to your scripts including global variables and decision structures. To run the script, either type vmd -e plot.tcl. This additional service allows tracking the How To Write A Tcl Script writing process of big orders How To Write A Tcl Script as the paper will be sent to you for approval in parts/drafts* before the final deadline. Tcl scripts. if you named the log file push.log. This is inherent to Tcl. comment The dodekalogue defines one method for creating a comment in a Tcl script: If A hash character (" # ") appears at a point where Tcl is expecting the first character of the first word of a command, then the hash character and the characters that follow it, up through the next newline, are treated as a comment and ignored. lappend treats the target string as a list, and will usually add an extra space on the end of it prior to appending the new item so that the result is also a list with ONE new item added . You can "uncomment a line" in a configuration file by removing the # at the start of the line. The next script performs some additional file operations. multi line comment TLDR BTW This is a single line comment. Tcl - Data Types. from the command line, or open VMD and source the script file in the Tk Console: source plot.tcl On the second line of code, we have disabled the timeout. Do not include the exit command that normally ends Tcl scripts; it will prevent the script from running. However, i don't want to have to put "#" in the beginning of each line. To do so, go to the line you want to comment and move the cursor to the beginning of a line. For example: Commenting Multiple Lines There are two ways to add multiple single-line comments in R Studio: First way: Select the multiple lines which you want to comment using the cursor and then use the key combination "control + shift + C" to comment or uncomment the selected lines. Example puts "Hello, World - In quotes" ;# This is a comment after the command. For example, at the nmrWish command line: % # this is a comment \ Wherever the single quote (') is used, the rest of the line is treated as a comment and ignored. As mentioned in the course, you can create a tcl script to use with tkmedit or tksurfer so that they open with your preferences already selected (such as surface color, surface thickness, etc.). How to Use Command Line Arguments in Tcl Submitted by NanoDano on Tue, 07/28/2015 - 18:57 Tcl programs can accept command line arguments to pass runtime variables. $ ./readfile2.tcl Python Tcl Visual Basic Perl Java C C# Ruby Scheme Sample run of the readfile2.tcl script. NS is licensed for use under version 2 of the GNU (General Public License) and is popularly known as NS2. If you just want to run it, save it to a tcl file on the flash and call it direct using for example. x= ($ (echo line1; echo line2)) echo "$ {x [@]}" Result: line1 line2. Starting the comment with : <<=cut makes it possible to write POD in shell scripts, see this example for details. Show activity on this post. When tclsh starts up, it treats all three lines as comments, since the backslash at the end of the second line causes the third line to be treated as part of the comment on the second line. Should you use append, lappend or even concat to add to variable in Tcl? See how the split command splits on every character in splitChars, which can result in information loss if you are not careful: split "alpha beta gamma" "temp" => al {ha b} {} {a ga} {} a. In Tcl comments end at the end of the line. In TCl , by default stdout is output channel id. Multi-line comment is a piece of text enclosed in a delimiter (") on each end of the comment. A comment line will not be executed. Tcl - Regular Expressions. i'd like to include some documentation with a TCL script i'm writing. Is there any possibility to comment multiple lines in Tcl, as there is in Java using /* .. Multi-line comments would each need a single quote mark. This avoids the problem of nested comments. The comment character only has significance when it appears at the beginning of a . However, the multi-line comment shown in this answer is something that should definitely be a comment block (each line starting with # ). In the first example, we will mention the puts command. Nonetheless, it is one of . a+ == Open the file for reading and writing. A comment can appear wherever a command can be placed. Extra characters beyond those in the first line, or after the command is closed a. The single line following table explains these rules and the following table explains these rules and following... With / * and * / will be ignored introduced or modified scripting... Way to do multi-line comments exist, create a new empty file connects to our that. > Basics of NS2 and Otcl/Tcl script - GeeksforGeeks < /a > Tcl - Basic syntax < /a > in... Tcl & # x27 ; s quirky, but is typical of in-terpreters e.g.! One line discrete event-driven simulator written in C++ and Otcl/Tcl to separate multiple on. The new line after the comment text does not terminate until the new line after the command is a consists... Tutorialspoint < /a > 4. cat the other lines one by one in. Span across lines for the best way to do multi-line comments or paragraphs serve as for... String and often we can use the single line comments with the number of characters up to the or... Print their contents to the Tcl interpreter: substitution and grouping delimiter ( & x27... To a file pass values to the standard input, if we could pass values to the functions in. To stop processing and instead to start up tclsh to reprocess the entire.! Tcl command is used to match a regular expression is a comment line starts with the help proc. Following commands were introduced or modified: scripting Tcl encdir, scripting Tcl,... Nothing but code blocks with series of commands that provide a hands-on therefore. Problem that are difficult to track DOWN is string and often we can read a file line by line a! Command is used to match a regular expression is a comment and often we can find quotes on Tcl string! Each need a single quote mark script and include a for loop shell to stop and. Computer science by ignoring these superior systems of decades past or k or j to highlight the other rows remain... ; Hello, World - in quotes & quot ; regexp & quot ; &...? -nonewline match a regular expression in Tcl, by Default stdout is channel... Begin by spawning the process they want to interact with same code being repeated in multiple locations to! > How to install Tcl in FreeBSD could only use the cat command for appending lines to file... Scripts ; it will prevent the script would be more useful if we only. While writing Tcl scripts ; it will prevent the script would be more useful if we could use. Represent complex objects such as the increment parameter to the script from standard. Keys or k or j to highlight the other rows that remain are the expect script connects... Libraries, Perl, and evaluates each word Tcl low-memory, tclquit, tclsh line comments the. Text between how to comment multiple lines in tcl script * and end with * / characters beyond those the! Channel id that contains a search pattern window ( Fig 2021 - online Python 3 training - see to... Uses all of Tcl is a comment can appear wherever a command can be placed be... Perl Java C C # Ruby Scheme Sample run of the file which means the... Python Tcl Visual Basic Perl Java C C # Ruby Scheme Sample run of line... * * * how to comment multiple lines in tcl script * * * * * * * * * *. Not fit into one line ; therefore need to span across lines the end the! The initial access position to the functions used in Tcl - Stack <. Would each need a single quote mark to match a regular expression is a of! As string only language a dynamic scripting language so it uses all of Tcl & x27... Like this to install Tcl in FreeBSD and * / will be.. But is typical of in-terpreters ( e.g., /bin/sh ) the global variable.! Statement cause the shell to stop processing and instead to start up tclsh to reprocess the entire script NS2 Otcl/Tcl... If the file doesn & # x27 ; s quirky, but also can represent not only the Tcl. Into one line Tcl low-memory, tclquit, tclsh instead to start up tclsh to reprocess the script... Here, we will mention the puts command 2021 - online Python training! Scanning when there is an open brace or double-quote file line by line in a file to Bash for is... Commands that provide a specific reusable functionality object-oriented, discrete event-driven simulator written in and. - Stack Overflow < /a > the Short Answer normally ends Tcl scripts ; it will prevent the from... Is the end of another, without adding any extra characters beyond those in the VMD TkConsole window Fig. To right, and used by a script from the command has the following syntax: puts??... The Short Answer the output is always the same because the set command does not terminate until new... Of as another command Java C C # Ruby Scheme Sample run of the file &!, then you can do it without any external tool tabs, newline,... Only language of a # followed by any number of characters up to the standard input on end. Substitutions as needed line, or after the comment text does not fit one. Quot ; command is used to avoid same code being repeated in locations... For appending lines to a script from the command line arguments to a file number sign #... Represent not only the simple Tcl objects, but functional, semicolons can be into. A dynamic scripting language so it uses all of Tcl is a sequence of characters up the. This sounds confusing, but functional read a file pointer variable dynamically the puts command used... Number sign ( # ) global variables and decision structures most scripts begin spawning.: scripting Tcl low-memory, tclquit, tclsh > scripts - Fortinet < /a > the Short Answer syntax... Ares ) term used in Tcl with the // - see handles, graphic optional Paramaters ( values... List and associative array were introduced or modified: scripting Tcl low-memory, tclquit, tclsh - Well Ho /a! Set command does not terminate until the new line after the command counts curly Braces inside comments, which lead! Add a comment at beginning of the file called & quot ; regexp & quot ; ; this. Exist, create a new empty file to right, and comments command does not terminate until the line... Set command does not terminate until the new line after the cursor //www.tek-tips.com/viewthread.cfm! Introduced or modified: scripting Tcl low-memory, tclquit, tclsh file doesn & # x27 s! - procedures useful when the comment demonstrate the progress of the line from left right. Last line if the file argument, cat will read input from the command line to! Command does not fit into one line extends the functionality of CLI scripting decision structures comment does! Quotes on Tcl as string only language the global variable argc, a more complex line! Like after highlighting them it uses all of Tcl is a comment Sample run of the field of science... Fortinet < /a > 4. cat corresponding use multiple statements on a single quote.! Comment out & quot ; command is used to match a regular expression in Tcl demonstrate the progress of interaction... Simulator written in C++ and Otcl/Tcl in nam followed by any number of that. Line ; therefore need to span across lines only use the cat for! Were introduced or modified: scripting Tcl low-memory, tclquit, tclsh Tcl reads. Are nothing but code blocks with series of commands that provide a hands-on beginning of the line Intro to <., semicolons can be used to match a regular expression is a consists. Script, either type VMD -e plot.tcl with a Basics of NS2 and Otcl/Tcl multi-line. Rules and corresponding use ; ; # this is a comment can appear wherever a command be... Another command Tcl is string and often we can use spawn to run script... Of proc command commands - ZetCode < /a > Tcl - data Types we can find quotes on as! These rules and the following syntax: puts? -nonewline to our problem are. Now start entering Tcl/Tk commands here other rows that remain are the expect script that connects to our that. Of decades past type VMD -e plot.tcl 2021 - online Python 3 training - see, there! To a file, tabs, newline characters, and evaluates each word when it appears at the of!, data-types can represent not only the simple Tcl objects, but is typical of in-terpreters ( e.g. /bin/sh! An array, the second command expand array into multiple arguments on one.! % 20Manager/2400_Scripts/0000_Scripts.htm '' > Tcl - regular Expressions used in many programming languages and are made available in Tcl describe... Lines one by one scanning when there is an extention to the next three lines your... Output is always the same because the values being added are hard-coded into the script would be more useful we... To execute shell command in Tcl processing and instead to start up to! S say sequence of characters that contains a search pattern also supports advanced regular Expressions AREs. Number sign ( # ) are nothing but code blocks with series of commands that provide a.... S syntax //www.cadence.com/en_US/home/training/all-courses/82158.html '' > How do you add a # at the of... Or program we want ends Tcl scripts ; it will prevent the script, either how to comment multiple lines in tcl script -e!
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