$ 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,...
git clonethis repository, andcdto the ShellCheck source directory to build/install: $ cabal install This will compile ShellCheck and install it to your~/.cabal/bindirectory. Add this directory to yourPATH(for bash, add this to your~/.bashrc): exportPATH="$HOME/.cabal/bin:$PATH" Log out ...
Some systems use the message catalog selected by theLC_MESSAGESshell variable. Others create the name of the message catalog from the value of theTEXTDOMAINshell variable, possibly adding a suffix of ‘.mo’. If you use theTEXTDOMAINvariable, you may need to set theTEXTDOMAINDIRvariable to the...
You can assign data to a variable using the equals sign (=). The data you store in a variable can either be a string or a number. Let’s create a variable now on the command line: chapter_number=5 The variable name is on the left hand side of the equals sign, and the data whic...
Options are also taken from the environment variable "LESS". For example, to avoid typing "less -options ..." each time less is invoked, you might tell csh: setenv LESS "-options" or if you use sh: LESS="-options"; export LESS ...
Set a new value to a local variable from a function in Linux Bash What is global variable in shell script? What is the use of set in shell script? How to set environment variables in a bash shell? What are shell variables in Linux?
As a practical example, consider an imaginary library that defines a function using a username/password environment variable to access a remote service. If the library did a top-levelset -axbefore this function, then every time it’s loaded the debugging output will include displaying these vari...
Add this directory to your PATH (for bash, add this to your ~/.bashrc):export PATH="$HOME/.cabal/bin:$PATH"Log out and in again, and verify that your PATH is set up correctly:$ which shellcheck ~/.cabal/bin/shellcheckOn native Windows, the PATH should already be set up, but the...
If you'd like to change the install directory with the OSH environment variable, either by running export OSH=/your/path before installing, or by setting it before the end of the install pipeline like this: export OSH="$HOME/.dotfiles/oh-my-bash"; bash -c "$(curl -fsSL https://raw...
Putting all these commands together in order in thePROMPT_COMMANDshell variable will result in the the following, which you can paste into your.bashrcfile: ~/.bashrc . . .export PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND". . . ...