[PLUG] conditional redirect in shell script
Paul Heinlein
heinlein at attbi.com
Wed Jun 5 19:39:36 UTC 2002
On Wed, 5 Jun 2002, Galen Seitz wrote:
> I want to conditionally redirect stdout to /dev/null in a shell
> script. However, it appears that redirection occurs before variable
> expansion, which means my approach won't work. What is the correct
> way to do this?
You've got to eval it. Take a small example script:
#!/bin/bash
redir='> tmp.txt'
echo 'hello' $redir
Running that will produce unwanted output:
hello > tmp.txt
Adding an eval statement makes things right:
#!/bin/bash
redir='> tmp.txt'
eval echo 'hello' $redir
--Paul Heinlein <heinlein at attbi.com>
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