$ unset x $ showvar $x is not set $ x=3 $ showvar $x is not set $ export x $ showvar $x = 3 $ x= ## in bash, reassignment doesn't remove a variable from the environment $ showvar $x is set but empty 注意 showvar不是一个 bash 命令,而是一个如清单 5-1 所示的脚本,...
/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
#.bash_profile # Get the aliases and functionsif[-f~/.bashrc ]; then <==底下这三行在判断并读取 ~/.bashrc.~/.bashrc fi # User specific environment and startup programsPATH=$PATH:$HOME/.local/bin:$HOME/bin<==底下这几行在处理个人化设定exportPATH 这个文件内有设定 PATH 这个变量喔!而且还...
One of the handiest things about environment variables is that they are a standard part of the UNIX process model, which means that once an environment variable is set, it can be read by any subsequent process we run. Let’s try this and set an environment variable called $name with ...
exportGLOBAL="This is a global variable." Source the environment file to apply the changes by typing the following command: $source/etc/environment If you want to create an environment variable that stores the result of a command executed in a bash script, you will have to use parameter subs...
Paste a shell script onhttps://www.shellcheck.netfor instant feedback. ShellCheck.netis always synchronized to the latest git commit, and is the easiest way to give ShellCheck a go. Tell your friends! From your terminal Runshellcheck yourscriptin your terminal for instant output, as seen above...
bashEnvValue - Set value for BASH_ENV environment variable string. If the input is specified, its value is expanded and used as the path of a startup file to execute before running the script. If the environment variable BASH_ENV has already been defined, the task will override this ...
If the environment variable $XDG_CONFIG_HOME is present, it will place the nvm files there. You can add --no-use to the end of the above script to postpone using nvm until you manually use it:export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" ||...
To evaluate strings, use != and to evaluate numbers use -ne. The following If Then Else statement evaluates whether the $resourceGroup variable has been set. If yes, it returns the value of the variable. If no, it sets the variable. Azure CLI Copy if [ $resourceGroup != '' ]; th...
Set with export VARIABLE=VALUE Accessed by some programs for configuration The set, env and echo commands can be used to display all variables, environment variables and a single variable set | less env | less echo $PATH Some Common Variables ...