Use PATH_MAX if it exists 2个月前 jimregexp.c regexp: fix incorrect check for invalid escape sequence at end of charset 2年前 jimregexp.h jimregexp: rename local regex functions 5年前 jimsh.c build: win32: STDIN_FILENO may not be defined on Windows ...
Example 1–17 Using info to determine if a variable exists. if {![info exists foobar]} { set foobar 0 } else { incr foobar } Example 7–6 on page 86 implements a new version of incr which handles this case. More about Math Expressions This section describes a few fine points about ...
Vivado%puts"The PATH variable is$env(PATH) " To get the list of all the Unix environment variables: Vivado%:setall_env_var [array namesenv] It is possible to check if an environment variable exists (i.e a key toenvarray exists) by using theinfocommand. For example to check forMYVAR...
basic_unset.tcl set name "John Doe" puts "Before unset: $name" unset name puts "After unset: [info exists name]" This creates a variable name, prints it, then removes it with unset. The info exists command checks if the variable still exists. ...
[COLOR=#0000ff]# check if variable exists then print it[/color] [COLOR=#804040][b]set[/b][/color] var_name {COMPUTERNAME} [COLOR=#804040][b]if[/b][/color] {[[COLOR=#804040][b]info[/b][/color] exists env([COLOR=#008080]$var_name[/color])]} { [COLOR=#804040][b]set...
array_exists.tcl array set user { name John age 30 city New York } if {[array exists user]} { puts "User array exists" } else { puts "User array does not exist" } This demonstrates how to verify if a variable is an array before attempting to use array operations on it. The ...
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label4“EN当我运行此程序并输入testuser凭据时，一切都运行得很好，并在登录状态小部件上生成带有绿色...
{ set a 30 global a puts "a=$a" } % P2 =>var1= 100 % P3\ =>var1 =100 % P4 ;#试图使用不存在的全局变量 =>can't read "var2": no such variable % P5 ;#在定义局部变量后试图引用同名全局变量 =>variable "a" already exists 还有另外一种方式来直接使用全局变量即用双冒号(::),见...
set filename "data.txt" if {[file exists $filename]} { set filesize [file size $filename] puts "File size: $filesize bytes" } else { puts "File not found" } This script first checks if the file exists, then retrieves its size. The size is stored in a variable and displayed ...