/bin/sh redirection of stdin, stderr woes

[Maarten Litmaath]

In article <28770001 at hpopd.HP.COM>,
	ian at hpopd.HP.COM (Ian Watson) writes:
)I want to have a Bourne shell script that does something like :
)
)cmd >$sout 2>$serr
)
)Under certain conditions, sout and serr may be set earlier in the script to
)given files, otherwise the stdin and stderr from the calling process are to
)be inherited.  The simple way of doing this is to have something like :
)
)if vars_were_set_in_script ; then
)	cmd >$sout 2>$serr
)else
)	cmd
)fi

Try this:

	(
		test $vars_are_set && exec > $sout 2> $serr
		cmd
	)

Alternatively:

	if some_condition
	then
		OUT="> $outputfile"
		ERR="2> $errorfile"
	fi
	...
	eval "cmd $OUT $ERR"
--
"Please DON'T BREAK THE CHAIN!  Terry Wood broke the chain and ended up
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compilers."  --  tjw at unix.cis.pitt.edu (Terry J. Wood)