exp3.sub « tests - vyatta-bash.git - Vyatta shell based on GNU Bourne Again SHell (mirror of https://github.com/vyos/vyatta-bash.git)

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IFS=:

case A in ([[:graph:]]) echo graph;; *) echo non-graph;; esac
[[ A == [[:graph:]] ]] && echo yes || echo no

IFS="~"; read a b <<< a~q; echo $a
IFS=':'; read a b <<< a:q; echo $a