2024 Exists command in tcl

Exists command in tcl

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August undefined, 2024

WebMay 6, 2014 · You have the right code, test in tclsh: % if { [info exists ::env (USER)]} {puts "found $::env (USER)"} found strobel % The problem must be in your environment. Share Improve this answer Follow answered May 6, 2014 at 19:53 Str. 1,389 9 14 Add a comment Your Answer Post Your Answer http://tcl-lang.org/man/tcl8.5/tutorial/Tcl26.html

TCL: Check file existence by SHELL environment variable

WebThis is stated in the if manual page: The if command evaluates expr1 as an expression (in the same way that expr evaluates its argument). In contrast to Tcl itself, which is quite LISP-like and/or Unix shell-like, that " expr mini language" is way more "traditional" in the sense it feels like C. Share. WebNow that we have a named dictionary with key/value pairs, it becomes necessary to determine if the given key exists. To accomplish this, Tcl provides the dict exists command. The syntax is as follows: number in classic

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WebJun 19, 2024 · To check whether a variable exists precisely in a certain namespace, fully-qualify the variable name. info exists returns 0 for variables that exist but are undefined. This can happen, for example, with trace, because if a trace is set on a nonexisting … Tcl/Tk 8.6.13 sources are freely available as open source from the Tcl Developer … WebAug 6, 2013 · returns a list of names of all the Tcl commands visible (i.e. executable without using a qualified name) to the current namespace, including both the built-in … WebAug 30, 2012 · I have a shell environment variable PATH_TO_DIR and I want to check in TCL script that the file $PATH_TO_DIR/target.txt exists. My current solution is: catch {exec /usr/local/bin/tcsh -c "echo $PATH_TO_DIR/target.txt" } result if {! [file exists $result]} { puts "ERROR: the file $result is not exists" } I'm sure there is a more elegant way. number in cell phone

How do we find what packages exist in our tcl environment and where ...

Determining if a key exists Tcl/Tk 8.5 Programming Cookbook

WebTcl has two commands for reading from a file: getsis line-oriented, while readis block oriented (and suitable for random access I/O). Extended Tcl adds some other commands: bsearchsearches a sorted file using binary search, and lgetsis list-oriented (it reads Tcl lists). The getsCommand The getscommand comes in two flavors. nintendo switch games for adultWebThe alarm Command alarm seconds The Extended Tcl alarm command arranges for the kernel to send your process a SIGALRM (signal 14) in seconds seconds (this is a floating point value, so seconds may be fractional). If seconds is 0.0, any previous alarm request is cancelled. The alarm command returns the number of seconds left in the previous alarm. nintendo switch games for autism

"WebAug 6, 2013 · Tcl8.6.13/Tk8.6.13 Documentation > Tcl Commands > dict Tcl/Tk Applications ... Because of this, the variables set by dict with will continue to exist after the command finishes (unless explicitly unset). Note that the mapping of values to variables does not use traces; ... " - Exists command in tcl

Exists command in tcl

Expect tcl "file exists" function failing even though "ls" shows file

WebTcl provides a number of commands for introspection - commands that tell what is going on in your program, what the implementation is of your procedures, which variables have been set and so on.. The info command allows a Tcl program to obtain information from the Tcl interpreter. The next three lessons cover aspects of the info command. (Other … WebFeb 22, 2012 · The following code is done at the top level (not inside of any procedure): if {! [info exists g_log_file_name]} { set g_log_file_name "default.txt" } What I hope it …

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WebAug 6, 2013 · are as follows: On Unix, -groupgets or sets the group name for the file. -ownergets or sets the user name of the owner of the file. command returns the owner name, but the numerical id can be passed when setting the owner. -permissionsretrieves or sets a file's access permissions, using octal notation by default. This option also WebFeb 23, 2024 · The file exists command always works with local filesystems. If you want to check whether a remote system has a file, you'll have to exp_send it some instructions …

WebFeb 25, 2024 · TCL Command Info exist The “set” command is used to create and read variables as shown above. The unset command is used to destroy a variable. The “info exists” command returns 1 if varName … WebJun 27, 2014 · Since expect is an extension of Tcl, all Tcl commands are available to use: if { [file exists backup.txt]} { send "sed -i -e 's/$oldport/$newport/' backup.txt\r" expect "$ " } Share Improve this answer Follow answered Jun 27, 2014 at 11:38 glenn jackman 235k 38 219 346 Add a comment 1 Here is a quick approach by using ls

WebDec 11, 2024 · 1 Answer Sorted by: 1 The documentation for file delete says: Trying to delete a non-existent file is not considered an error. So you can just use file delete a.txt b.txt. There's no need to use glob in your example because you … WebFeb 23, 2024 · Tcl + Check file existence. 40,328. The file exists command always works with local filesystems. If you want to check whether a remote system has a file, you'll have to exp_send it some instructions to do the …

WebAug 5, 2024 · Tcl waits to build the package list until you ask for a package whose name it does not currently know. catch {package require thereisnosuchpackage} should mostly populate the list. However, there are some packages that are stored as Tcl modules and that never get entered into the list.

WebAug 6, 2013 · are as follows: On Unix, -groupgets or sets the group name for the file. -ownergets or sets the user name of the owner of the file. command returns the owner … number including stdWebSynopsis info exists varName Description . info exists tests whether a variable exists and is defined.. Synopsis info exists varName Description . Returns 1 if the variable named … number index tabsWebTcl does not expand file names like the UNIX/Linux shells do. So: exec ls *.tcl will fail - there is most probably no file with the literal name "*.tcl". If you need such an expansion, you should use the glob command: eval exec ls [glob *.tcl] or, from Tcl 8.5 onwards: exec ls … number increased by percentage calculatorWebMar 17, 2024 · Using file exists always fails though! I have edited the procedure below to further illustrate my problem. I explicitly create hello.txt and check for it's existence, but it always fails. proc verify_file_exists {filename} { send "touch hello.txt\r" if { [file exists hello.txt]} { puts "hello.txt found\r" } else { puts "Failed to find hello.txt ... number increment pattern in cWebVerify if directory /var/cti/adm/APP exists. If APP not exists under adm directory , then need to create this directory and add ownership to this directory , ( as chown system ) … nintendo switch games for a 6 year oldWebThe syntax of an ' if...else ' statement in Tcl language is − if {boolean_expression} { # statement (s) will execute if the boolean expression is true } else { # statement (s) will execute if the boolean expression is false } nintendo switch games for ages 5 8WebJan 10, 2024 · We verify the existence of the variable using the info exists command. Command line arguments Tcl scripts like any other scripts can take command line arguments. Tcl has three predefined variables. $argc - the number of arguments passed to the script $argv - the list of arguments $argv0 - the name of the script number in cpus