巴什和放大器; (符号)运算符 [英] Bash & (ampersand) operator
问题描述
我想在bash shell中并行运行3个命令:
I'm trying to run 3 commands in parallel in bash shell:
$ (first command) & (second command) & (third command) & wait
这样做的问题是,如果第一个命令
失败,例如,出口code是 0
(我猜是因为等
成功)。
The problem with this is that if first command
fails, for example, the exit code is 0
(I guess because wait
succeeds).
期望的行为是,如果命令之一出现故障,则出射code将是非零(并且理想地,在其他运行指令将被停止)。
The desired behavior is that if one of the commands fails, the exit code will be non-zero (and ideally, the other running commands will be stopped).
我怎么能做到这一点?
请注意,我想以并行方式运行的命令!
Please note that I want to run the commands in parallel!
推荐答案
我能想到的最好的是:
first & p1=$!
second & p2=$!
...
wait $p1 && wait $p2 && ..
或
wait $p1 || ( kill $p2 $p3 && exit 1 )
...
然而,这仍然强制执行的过程中检查的顺序,因此如果第三立即失败,你不会注意到它,直到第一和第二饰面。
however this still enforces an order for the check of processes, so if the third fails immediately you won't notice it until the first and second finishes.
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