source: trunk/essentials/sys-devel/m4/doc/mdate-sh@ 3166

#!/bin/sh
# Get modification time of a file or directory and pretty-print it.

scriptversion=2005-06-29.22

# Copyright (C) 1995, 1996, 1997, 2003, 2004, 2005 Free Software
# Foundation, Inc.
# written by Ulrich Drepper <[email protected]>, June 1995
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

# As a special exception to the GNU General Public License, if you
# distribute this file as part of a program that contains a
# configuration script generated by Autoconf, you may include it under
# the same distribution terms that you use for the rest of that program.

# This file is maintained in Automake, please report
# bugs to <[email protected]> or send patches to
# <[email protected]>.

case $1 in
  '')
     echo "$0: No file.  Try \`$0 --help' for more information." 1>&2
     exit 1;
     ;;
  -h | --h*)
    cat <<\EOF
Usage: mdate-sh [--help] [--version] FILE

Pretty-print the modification time of FILE.

Report bugs to <[email protected]>.
EOF
    exit $?
    ;;
  -v | --v*)
    echo "mdate-sh $scriptversion"
    exit $?
    ;;
esac

# Prevent date giving response in another language.
LANG=C
export LANG
LC_ALL=C
export LC_ALL
LC_TIME=C
export LC_TIME

# GNU ls changes its time format in response to the TIME_STYLE
# variable.  Since we cannot assume `unset' works, revert this
# variable to its documented default.
if test "${TIME_STYLE+set}" = set; then
  TIME_STYLE=posix-long-iso
  export TIME_STYLE
fi

save_arg1=$1

# Find out how to get the extended ls output of a file or directory.
if ls -L /dev/null 1>/dev/null 2>&1; then
  ls_command='ls -L -l -d'
else
  ls_command='ls -l -d'
fi

# A `ls -l' line looks as follows on OS/2.
#  drwxrwx---        0 Aug 11  2001 foo
# This differs from Unix, which adds ownership information.
#  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
#
# To find the date, we split the line on spaces and iterate on words
# until we find a month.  This cannot work with files whose owner is a
# user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
# will be owned by a user whose name is a month.  So we first look at
# the extended ls output of the root directory to decide how many
# words should be skipped to get the date.

# On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
set x`ls -l -d /`

# Find which argument is the month.
month=
command=
until test $month
do
  shift
  # Add another shift to the command.
  command="$command shift;"
  case $1 in
    Jan) month=January; nummonth=1;;
    Feb) month=February; nummonth=2;;
    Mar) month=March; nummonth=3;;
    Apr) month=April; nummonth=4;;
    May) month=May; nummonth=5;;
    Jun) month=June; nummonth=6;;
    Jul) month=July; nummonth=7;;
    Aug) month=August; nummonth=8;;
    Sep) month=September; nummonth=9;;
    Oct) month=October; nummonth=10;;
    Nov) month=November; nummonth=11;;
    Dec) month=December; nummonth=12;;
  esac
done

# Get the extended ls output of the file or directory.
set dummy x`eval "$ls_command \"\$save_arg1\""`

# Remove all preceding arguments
eval $command

# Because of the dummy argument above, month is in $2.
#
# On a POSIX system, we should have
#