How do you assign the output of a command to a variable in a shell script?

How do you assign the output of a command to a variable in a shell script?

To store the output of a command in a variable, you can use the shell command substitution feature in the forms below: variable_name=$(command) variable_name=$(command [option …] arg1 arg2 …) OR variable_name=’command’ variable_name=’command [option …] arg1 arg2 …’

How do I change the value of a variable in Linux?

To make an environment persistent for a user’s environment, we export the variable from the user’s profile script.

1. Open the current user’s profile into a text editor. vi ~/.bash_profile.
2. Add the export command for every environment variable you want to persist. export JAVA_HOME=/opt/openjdk11.
3. Save your changes.

How do you save a command in a shell script?

To use bash redirection, you run a command, specify the > or >> operator, and then provide the path of a file you want the output redirected to. > redirects the output of a command to a file, replacing the existing contents of the file.

How to store output of shell script to variable in Unix?

Now i want to store the output of script.sh into a unix command variable. say $a = {output of script.sh} Two simple examples to capture output the pwd command:

How to change the output of a command in Bash?

In addition to backticks `command`, command substitution can be done with $ (command) or “$ (command)”, which I find easier to read, and allows for nesting. Quoting ( “) does matter to preserve multi-line variable values; it is optional on the right-hand side of an assignment, as word splitting is not performed, so OUTPUT=$ (ls -1) would work fine.

Why do I need to store my Bash output in variables?

Sorry, there is a loong answer, but as bash is a shell, where the main goal is to run other unix commands and react to resut code and/or output, ( commands are often piped filter, etc… ). Storing command output in variables is something basic and fundamental.

How to return exit value from shell script?

In general a more flexible approach would be to return an exit value from the command and use it for further processing, though sometimes we just may want to capture the simple output from a command. You should probably re-write the script to return a value rather than output it. Instead of: