And now you can use this variable as you want. Assign the command output to a variable Yes! You can store the output of a command in a variable and use them in your script. It's called command substitution. var=$(command) Here's an example: abhishek@itsfoss:~$ today=$(date +%D)...
/bin/bash# Change the current directory to the script directorypushd$(dirname$0)>/dev/null# Store the current directory in a variablescript_dir=$PWDecho"The script is located in:$script_dir"# Return to the previous directorypopd>/dev/null# Output:# The script is located in: /path/to/yo...
You can even find out the current working directory of your Ubuntu 20.04 system and store it in a variable. All you have to do is to run the command shown below: working_directory=$(pwd) Running this command will store your current working directory in the working_directory variable. After...
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...
current_directory=$(pwd) In this example, the output of thepwdcommand (whichprints the current working directory) is assigned to thecurrent_directoryvariable. You can also set variables to empty values by simply not providing a value after the equals sign: ...
Variable Example Function SHELL /bin/bash Defines the name of the shell used PWD /root Shows the current working directory LOGNAME root Defines the logged-in user name MOTD_SHOWN pam Defines the message of the day for the system HOME root Home directory of the user LS_COLORS rs=0:di=01...
$current_dir=`pwd` $echo"The current directory is :$current_dir" Output: Command with option and argument The option and argument are mandatory for some bash commands. The following examples show how you can store the output of the command with option and argument into a variable. ...
In general, avoid inserting user-provided input into the argument string passed to jb before the value's =. To create dynamic object property names from user input, store the user-provided value in a variable or file, and use an @ref to reference it: $ dynamic_prop='Untrusted' jb @dyna...
$ 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,...
Variable names should be descriptive and cannot start with a number or contain spaces. They can start with an underscore and can have alphanumeric characters. Variables can be used to store and reference values. The value of a variable can be changed, and it can be referenced by using the ...