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As far as I’ve seen there are two ways to initialize a variable with the output of a process. Is there any difference between these two?
ex1=`echo 'hello world'`
ex2=$(echo 'hello world')
You get same effect.
The
$()is recommended since it’s more readable and makes it easier to nest one$()into another$().Update:
The
$()syntax is a POSIX 1003.1 standard (2004 edition). However, on some older UNIX systems (SunOS, HP-UX, etc.) the/bin/shdoes not understand it.You might need to use backtick “`” instead or use another shell (usually it’s ksh) if you need your script to work on such environment.
If you don’t know which syntax to use – use
$(). Backtick syntax is deprecated.