可以在 bash 子 shell 中调用函数作为后台作业吗？
假设我有一个 bash 函数，
Yadda() {
# time-consuming processes that must take place sequentially
# the result will be appended >> $OUTFILE
# $OUTFILE is set by the main body of the script
# No manipulation of variables in the main body
# Only local-ly defined variables are manipulated
}
我是否可以在子 shell 中调用该函数作为后台作业？例如：
OUTFILE=~/result
for PARM in $PARAMLIST; do
( Yadda $PARM ) &
done
wait
cat $OUTFILE
你觉得怎么样？
Let's say I have a bash function
Yadda() {
# time-consuming processes that must take place sequentially
# the result will be appended >> $OUTFILE
# $OUTFILE is set by the main body of the script
# No manipulation of variables in the main body
# Only local-ly defined variables are manipulated
}
Am I allowed to invoke the function as a background job in a subshell? E.g.:
OUTFILE=~/result
for PARM in $PARAMLIST; do
( Yadda $PARM ) &
done
wait
cat $OUTFILE
What do you think?
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评论（1）
您可以在子 shell 中将函数作为后台作业调用。它将像您在示例中输入的一样工作。
我在您的示例中演示的方式中发现了一个问题。如果某些进程同时完成，它们将尝试同时写入 OUTFILE，并且输出可能会混淆。
我建议让每个进程写入自己的文件，然后在所有进程完成后收集文件。
You can invoke the function as a background job in a subshell. It will work just like you typed in your example.
I see one problem in the way you demonstrated it in your example. If some of the processes finish simultaneously, they will try to write to the OUTFILE at the same time and the output might get mixed up.
I suggest to let each process write to it's own file then collect the files after all processes are done.