scripts/mdate-sh

   1 #!/bin/sh
   2 # Get modification time of a file or directory and pretty-print it.
   3 # Copyright (C) 1995, 1996, 1997, 2003  Free Software Foundation, Inc.
   4 # written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2, or (at your option)
   9 # any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software Foundation,
  18 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20 # As a special exception to the GNU General Public License, if you
  21 # distribute this file as part of a program that contains a
  22 # configuration script generated by Autoconf, you may include it under
  23 # the same distribution terms that you use for the rest of that program.
  24
  25 # Prevent date giving response in another language.
  26 LANG=C
  27 export LANG
  28 LC_ALL=C
  29 export LC_ALL
  30 LC_TIME=C
  31 export LC_TIME
  32
  33 save_arg1="$1"
  34
  35 # Find out how to get the extended ls output of a file or directory.
  36 if ls -L /dev/null 1>/dev/null 2>&1; then
  37   ls_command='ls -L -l -d'
  38 else
  39   ls_command='ls -l -d'
  40 fi
  41
  42 # A `ls -l' line looks as follows on OS/2.
  43 #  drwxrwx---        0 Aug 11  2001 foo
  44 # This differs from Unix, which adds ownership information.
  45 #  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
  46 #
  47 # To find the date, we split the line on spaces and iterate on words
  48 # until we find a month.  This cannot work with files whose owner is a
  49 # user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
  50 # will be owned by a user whose name is a month.  So we first look at
  51 # the extended ls output of the root directory to decide how many
  52 # words should be skipped to get the date.
  53
  54 # On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
  55 set - x`$ls_command /`
  56
  57 # Find which argument is the month.
  58 month=
  59 command=
  60 until test $month
  61 do
  62   shift
  63   # Add another shift to the command.
  64   command="$command shift;"
  65   case $1 in
  66     Jan) month=January; nummonth=1;;
  67     Feb) month=February; nummonth=2;;
  68     Mar) month=March; nummonth=3;;
  69     Apr) month=April; nummonth=4;;
  70     May) month=May; nummonth=5;;
  71     Jun) month=June; nummonth=6;;
  72     Jul) month=July; nummonth=7;;
  73     Aug) month=August; nummonth=8;;
  74     Sep) month=September; nummonth=9;;
  75     Oct) month=October; nummonth=10;;
  76     Nov) month=November; nummonth=11;;
  77     Dec) month=December; nummonth=12;;
  78   esac
  79 done
  80
  81 # Get the extended ls output of the file or directory.
  82 set - x`eval "$ls_command \"\$save_arg1\""`
  83
  84 # Remove all preceding arguments
  85 eval $command
  86
  87 # Get the month.  Next argument is day, followed by the year or time.
  88 case $1 in
  89   Jan) month=January; nummonth=1;;
  90   Feb) month=February; nummonth=2;;
  91   Mar) month=March; nummonth=3;;
  92   Apr) month=April; nummonth=4;;
  93   May) month=May; nummonth=5;;
  94   Jun) month=June; nummonth=6;;
  95   Jul) month=July; nummonth=7;;
  96   Aug) month=August; nummonth=8;;
  97   Sep) month=September; nummonth=9;;
  98   Oct) month=October; nummonth=10;;
  99   Nov) month=November; nummonth=11;;
 100   Dec) month=December; nummonth=12;;
 101 esac
 102
 103 day=$2
 104
 105 # Here we have to deal with the problem that the ls output gives either
 106 # the time of day or the year.
 107 case $3 in
 108   *:*) set `date`; eval year=\$$#
 109        case $2 in
 110          Jan) nummonthtod=1;;
 111          Feb) nummonthtod=2;;
 112          Mar) nummonthtod=3;;
 113          Apr) nummonthtod=4;;
 114          May) nummonthtod=5;;
 115          Jun) nummonthtod=6;;
 116          Jul) nummonthtod=7;;
 117          Aug) nummonthtod=8;;
 118          Sep) nummonthtod=9;;
 119          Oct) nummonthtod=10;;
 120          Nov) nummonthtod=11;;
 121          Dec) nummonthtod=12;;
 122        esac
 123        # For the first six month of the year the time notation can also
 124        # be used for files modified in the last year.
 125        if (expr $nummonth \> $nummonthtod) > /dev/null;
 126        then
 127          year=`expr $year - 1`
 128        fi;;
 129   *) year=$3;;
 130 esac
 131
 132 # The result.
 133 echo $day $month $year