minix/commands/rotate/rotate.sh

   1 #!/bin/sh
   2 BZIP=/usr/bin/bzip2
   3 RM="rm -f"
   4 MV="mv -f"
   5
   6 if [ $# -ne 2 ]
   7 then    echo "Usage: $0 <log> <keep>"
   8         exit 1
   9 fi
  10
  11 if [ ! -f "$1" ]
  12 then     exit 1
  13 fi
  14
  15 if [ ! -x "$BZIP" ]
  16 then    exit 1
  17 fi
  18
  19 if [ "$2" -le 0 ]
  20 then    echo "Keep at least 1 copy please."
  21         exit 1
  22 fi
  23
  24 k="$2"
  25 $RM "$1.$k" 2>/dev/null || exit 1
  26 while [ "$k" -ge 2 ]
  27 do      prev="`expr $k - 1`"
  28         $MV $1.$prev.bz2 $1.$k.bz2 2>/dev/null
  29         k=$prev
  30 done
  31 $BZIP -c $1 >$1.1.bz2 && : >$1