Re: read built-in command has a problem in shell function

[Andreas Schwab]

On Okt 11 2021, Hyunho Cho wrote:

> this command works well in *shell script file*
> but in shell function does not work well

This has nothing to do with shell functions.  It is a simple race
condition.

> sh$ echo 111 | myfunc        # OK
> yes
>
> sh$ cat foo.c | myfunc        # NOT WORK!
>
> sh$ date | myfunc               # NOT WORK!
>
>
> #### if i change like this. then this time work well
>
> sh$ date | { date > /dev/null; myfunc ;}
> yes

This depends on the left side of the pipe producing output faster than
the right side performing read -t 0.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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