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random/switch-with-bk.sh

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#!/bin/sh
# This simply switched the given file(s) with a $filename.bak file if it exists
# and creates a backup if it doesn't exist
if [ $# -ge 1 ]; then
for f in $@
do
[ -f "$f.bak" ] && mv "$f.bak" "$f.tmp"
[ -f "$f" ] && cp -l "$f"{,.bak}
[ -f "$f.tmp" ] && mv "$f.tmp" "$f"
done
else
echo "No filenames passed."
exit 1
fi