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bak (416B) [raw]

      1 #!/bin/sh
      2 # bak -- move a file to file.bak (or back)
      3 set -e
      4 die() {
      5 	echo "$*" 1>&2
      6 	exit 1
      7 }
      8 
      9 [ -z "$1" ] && die "usage: bak FILE"
     10 
     11 BAK="$1.bak"
     12 if [ -e "$BAK" ] && [ -e "$1" ]; then
     13 	die "$1 and $BAK exist, unable to bak or unbak"
     14 elif [ -e "$BAK" ]; then
     15 	mv "$BAK" "$1"
     16 	echo "$BAK -> $1"
     17 elif [ -e "$1" ]; then
     18 	mv "$1" "$BAK"
     19 	echo "$1 -> $BAK"
     20 else
     21 	die "Neither $1 nor $BAK exist, unable to bak or unbak"
     22 fi