?? t-out.sh
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#!/bin/bash# t-out.sh# Inspired by a suggestion from "syngin seven" (thanks).TIMELIMIT=4 # 4 secondsread -t $TIMELIMIT variable <&1# ^^^# In this instance, "<&1" is needed for Bash 1.x and 2.x,# but unnecessary for Bash 3.x.echoif [ -z "$variable" ] # Is null?then echo "Timed out, variable still unset."else echo "variable = $variable"fi exit 0?? 快捷鍵說明
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