user-tools/swap

   1 #!/bin/bash
   2
   3 true <<EOF
   4 =pod
   5
   6 =head1 NAME
   7
   8 swap - swaps two files' names
   9
  10 =cut
  11
  12 EOF
  13
  14
  15 set -e
  16
  17 if [ $# -ne 2 ]
  18 then
  19         echo "swap: 2 arguments needed"
  20         exit 1
  21 fi
  22 if [ ! -e "$1" ]
  23 then
  24         echo "swap: file does not exist: $1"
  25         exit 1
  26 fi
  27 if [ ! -e "$2" ]
  28 then
  29         echo "swap: file does not exist: $2"
  30         exit 1
  31 fi
  32
  33
  34 TMP=`TMPDIR=. mktemp $([ -d "$1" ] && echo --directory) --dry-run -t .swap.XXXXXX`
  35
  36 if mv -Tv "$1" "$TMP"
  37 then
  38         if mv -Tv "$2" "$1"
  39         then
  40                 if mv -Tv "$TMP" "$2"
  41                 then
  42                         exit 0
  43                 fi
  44                 exit 4
  45         fi
  46         exit 3
  47 fi
  48
  49 exit 2