Bash Command Substitution: Difference between revisions
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=Overview= | =Overview= | ||
Command substitution is invoked with: | |||
<syntaxhighlight lang="bash"> | |||
$(command) | |||
</syntaxhighlight> | |||
An equivalent, older and obsolete style is: | |||
<syntaxhighlight lang="bash"> | |||
`command` | |||
</syntaxhighlight> | |||
Command substitution allows us to take the stdout output of a command or [[Bash_Functions#Returning_Values|function]], which would normally be sent to stdout of the executing shell, and save it as the value of a variable. To do this we place the command or the function within brackets, preceded by a $ sign. | Command substitution allows us to take the stdout output of a command or [[Bash_Functions#Returning_Values|function]], which would normally be sent to stdout of the executing shell, and save it as the value of a variable. To do this we place the command or the function within brackets, preceded by a $ sign. | ||
Revision as of 18:41, 3 October 2019
Internal
Overview
Command substitution is invoked with:
$(command)
An equivalent, older and obsolete style is:
`command`
Command substitution allows us to take the stdout output of a command or function, which would normally be sent to stdout of the executing shell, and save it as the value of a variable. To do this we place the command or the function within brackets, preceded by a $ sign.
local content
content=$(ps -ef)