If it is a one-liner then your perl is probably simple enough to go into " rather than ' (just backlash any $vars or double quotes), so:
export F="\t"
perl -F$F -line "munge(@F); print join($F, @F);" file
The join($F, @F) looks a bit evil, but hey.
Sadly, this doesn't work:
F="\t" perl -F$F -line "munge(@F); print join($F, @F);" file
Presumably because the prefixed env var doesn't apply to the shell's expansion of the line.
Does anyone know a trick to make this (shorter) approach work?
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