一次班轮测试

你可以做这样的事情：

[[ $s = 'something' ]] && echo 'matched' || echo "didn't match"
[[ $s == 'something' ]] && echo 'matched' || echo "didn't match"
[[ $s != 'something' ]] && echo "didn't match" || echo "matched"
[[ $s -eq 10 ]] && echo 'equal' || echo "not equal"
(( $s == 10 )) && echo 'equal' || echo 'not equal'

退出状态的一次班轮测试：

command && echo 'exited with 0' || echo 'non 0 exit'
cmd && cmd1 && echo 'previous cmds were successful' || echo 'one of them failed'
cmd || cmd1 #If cmd fails try cmd1