user-tools/logrotate-counters

   1 #!/bin/bash
   2
   3 true <<EOF
   4 =pod
   5
   6 =head1 NAME
   7
   8 logrotate-counters - Increment numbers in file names
   9
  10 =cut
  11
  12 EOF
  13
  14
  15 set -u
  16 set -e
  17 set -o pipefail
  18
  19 . /usr/lib/tool/bash-utils
  20
  21 if [ $# = 0 ]
  22 then
  23         warnx "This command is to increment counters in file names."
  24         warnx "Usage: $0 [--dry-run] [basename-1 [basename-2 [...]]]"
  25         warnx "Where basename is the file name (eg. \"access.log\") on which numbers in all \"access.log.NUMBER.*\" files are gonna be incremented."
  26         exit 1
  27 fi
  28
  29 dryrun=''
  30
  31 if [ "$1" = --dry-run ]
  32 then
  33         dryrun=1
  34         shift
  35 fi
  36
  37 shopt -s extglob
  38 shopt -s nullglob
  39
  40 LF=$'\n'
  41 TAB=$'\t'
  42
  43 for basename in "$@"
  44 do
  45         basename_length=${#basename}
  46         for filename in "$basename".+([0-9]).*
  47         do
  48                 if [ -n "${filename//[!$TAB]/}" -o -n "${filename//[!$LF]/}" ]
  49                 then
  50                         warnx "Tab or linefeed char in filename - skipping it: $filename"
  51                         continue
  52                 fi
  53
  54                 ending=${filename:$basename_length}
  55                 if [[ $ending =~ ^\.([0-9]+)\.(.+)$ ]]
  56                 then
  57                         counter=${BASH_REMATCH[1]}
  58                         remainder=${BASH_REMATCH[2]}
  59                         newname=$basename.$[counter+1].$remainder
  60                         echo "$counter  $filename       $newname"
  61                 fi
  62         done |\
  63         sort -n -r |\
  64         while read -r counter filename newname
  65         do
  66                 if [ $dryrun ]
  67                 then
  68                         echo "$filename" '->' "$newname"
  69                 else
  70                         mv -n -v "$filename" "$newname"
  71                 fi
  72         done
  73 done