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#!/bin/sh
# zforce: force a gz extension on all gzip files so that gzip will not
# compress them twice.
#
# This can be useful for files with names truncated after a file transfer.
# 12345678901234 is renamed to 12345678901.gz
x=`basename $0`
if test $# = 0; then
echo "force a '.gz' extension on all gzip files"
echo usage: $x files...
exit 1
fi
res=0
for i do
if test ! -f "$i" ; then
echo ${x}: $i not a file
res=1
continue
fi
test `expr "$i" : '.*[.-]z$'` -eq 0 || continue
test `expr "$i" : '.*[.-]gz$'` -eq 0 || continue
test `expr "$i" : '.*[.]t[ag]z$'` -eq 0 || continue
if gzip -l < "$i" 2>/dev/null | grep '^defl' > /dev/null; then
if test `expr "$i" : '^............'` -eq 12; then
new=`expr "$i" : '\(.*\)...$`.gz
else
new="$i.gz"
fi
if mv "$i" "$new" 2>/dev/null; then
echo $i -- replaced with $new
continue
fi
res=1; echo ${x}: cannot rename $i to $new
fi
done
exit $res
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