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Try:STR="bla bla bla [123] bla bla"
RUNID=$(echo ${STR} | awk -F'[\\[\\]]' '{print $2}')
echo ${RUNID}
BTW, if you wanted to use backticks (`) and (") you would need to do this to make it work...

awk -F'[][]' '{print $2}'

awk -F"[\\\[\\\]]" '{print $2}' fileDon't ask how it works, cause I have no idea ;)
Another way, with a little less escaping:awk -F'[\\[\\]]' '{print $2}' file