> On Tue, Oct 17, 2000 at 04:59:48PM +0200, guy keren wrote:
> > there is a dirty method you could use. every once in a while (perhaps even
> > via a cron job), execute the command:
> >
> > :>/path/to/.xsession-error
>
> Cool.
>
> I love these little shell tricks... I'm personally particularly fond
> of the old "(cd dir1; tar c) | (cd dir2; tar xv)" thing, but it's been
> discussed here extensively before.
>
> Also, seems that not many people are aware of "process substitution"
> in bash: you do something like "diff <(ls dir1) <(ls dir2)", and bash
> runs two ls's, each writing to a FIFO, and diff gets the names of
> these two FIFOs as parameters. Output redirection also works. I'm not
> sure how portable it is, though.
>
1.
[08:05:37 /tmp]$ diff < (ls ~/setiathome/) <(ls ~/setiathome/amos/)
bash: syntax error near unexpected token `(l'
[08:06:04 /tmp]$
Ache, the space there is significant:
[08:17:12 /tmp]$ diff <(ls ~/setiathome/) <(ls ~/setiathome/amos/)
1,4c1
< NOTE
< README
< README.xsetiathome
< amos
---
> Release_Notes.txt
8a6
> result.sah
11c9
< setiathome-3.0.i386-pc-linux-gnu-gnulibc2.1.tar
---
> setiathome_win_3_0.exe
14a13
> windows_help.txt
16c15
< xsetiathome
---
> wtemp.sah
[08:18:20 /tmp]$
2.
This will only work if the "main" process (diff in this example) does not need
to seek the input since it can not do it with a FIFO. Or am I missing
something?
> Does anyone else like these tricks? I'd love to hear about other
> people's.
>
>
> - Adi Stav
>
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--
Shaul Karl <[EMAIL PROTECTED]>
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