[[ $list =~ (^|[[:space:]])$x($|[[:space:]]) ]] && echo 'yes' || echo 'no'
或创建一个函数：
contains() { [[ $1 =~ (^|[[:space:]])$2($|[[:space:]]) ]] && exit(0) || exit(1)}使用它：
contains aList anItemecho $? # 0： match, 1: failed
[[ $list =~ (^|[[:space:]])$x($|[[:space:]]) ]] && echo 'yes' || echo 'no'
或创建一个函数：
contains() { [[ $1 =~ (^|[[:space:]])$2($|[[:space:]]) ]] && exit(0) || exit(1)}使用它：
contains aList anItemecho $? # 0： match, 1: failed
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