$ 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 ...
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...
The environment variable is parsed before the command line, so command line options override the LESS environment variable. If an option appears in the LESS variable, it can be reset to its default value on the command line by beginning the command line option with "-+". Some options like ...
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...
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...
To set up common data stores, run the datastores.sh script:$ ./datastores.sh Section 5: Data Stores describes the installed packages and usage.web.sh scriptTo set up a JavaScript web development environment, Run the web.sh script:
[REQUIRED] Environment info Trying to build a Dockerfile: FROM node:13-alpine RUN apk update && apk add bash git curl sudo # patch sudo https://unix.stackexchange.com/a/578950 RUN echo "Set disable_coredump false" >> /etc/sudo.conf RUN c...
You must use the double semicolon (;;) to delimit compound-command and introduce the next pattern. Note: By default, pattern-matching (like file name generation) in case statements is case-insensitive. To make pattern-matching case-sensitive, set the environment variable TK_DUALCASE_IN_CASE...
If you'd like to change the install directory with theOSHenvironment variable, either by runningexport OSH=/your/pathbefore 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://gitee.com...