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/contrib/cvs/doc/mdate-sh

https://bitbucket.org/freebsd/freebsd-head/
Shell | 201 lines | 107 code | 18 blank | 76 comment | 3 complexity | ba25b8a8910b7416a09ad23611286acb MD5 | raw file
  1#!/bin/sh
  2# Get modification time of a file or directory and pretty-print it.
  3
  4scriptversion=2005-06-29.22
  5
  6# Copyright (C) 1995, 1996, 1997, 2003, 2004, 2005 Free Software
  7# Foundation, Inc.
  8# written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995
  9#
 10# This program is free software; you can redistribute it and/or modify
 11# it under the terms of the GNU General Public License as published by
 12# the Free Software Foundation; either version 2, or (at your option)
 13# any later version.
 14#
 15# This program is distributed in the hope that it will be useful,
 16# but WITHOUT ANY WARRANTY; without even the implied warranty of
 17# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18# GNU General Public License for more details.
 19#
 20# You should have received a copy of the GNU General Public License
 21# along with this program; if not, write to the Free Software Foundation,
 22# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 23
 24# As a special exception to the GNU General Public License, if you
 25# distribute this file as part of a program that contains a
 26# configuration script generated by Autoconf, you may include it under
 27# the same distribution terms that you use for the rest of that program.
 28
 29# This file is maintained in Automake, please report
 30# bugs to <bug-automake@gnu.org> or send patches to
 31# <automake-patches@gnu.org>.
 32
 33case $1 in
 34  '')
 35     echo "$0: No file.  Try \`$0 --help' for more information." 1>&2
 36     exit 1;
 37     ;;
 38  -h | --h*)
 39    cat <<\EOF
 40Usage: mdate-sh [--help] [--version] FILE
 41
 42Pretty-print the modification time of FILE.
 43
 44Report bugs to <bug-automake@gnu.org>.
 45EOF
 46    exit $?
 47    ;;
 48  -v | --v*)
 49    echo "mdate-sh $scriptversion"
 50    exit $?
 51    ;;
 52esac
 53
 54# Prevent date giving response in another language.
 55LANG=C
 56export LANG
 57LC_ALL=C
 58export LC_ALL
 59LC_TIME=C
 60export LC_TIME
 61
 62# GNU ls changes its time format in response to the TIME_STYLE
 63# variable.  Since we cannot assume `unset' works, revert this
 64# variable to its documented default.
 65if test "${TIME_STYLE+set}" = set; then
 66  TIME_STYLE=posix-long-iso
 67  export TIME_STYLE
 68fi
 69
 70save_arg1=$1
 71
 72# Find out how to get the extended ls output of a file or directory.
 73if ls -L /dev/null 1>/dev/null 2>&1; then
 74  ls_command='ls -L -l -d'
 75else
 76  ls_command='ls -l -d'
 77fi
 78
 79# A `ls -l' line looks as follows on OS/2.
 80#  drwxrwx---        0 Aug 11  2001 foo
 81# This differs from Unix, which adds ownership information.
 82#  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
 83#
 84# To find the date, we split the line on spaces and iterate on words
 85# until we find a month.  This cannot work with files whose owner is a
 86# user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
 87# will be owned by a user whose name is a month.  So we first look at
 88# the extended ls output of the root directory to decide how many
 89# words should be skipped to get the date.
 90
 91# On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
 92set x`ls -l -d /`
 93
 94# Find which argument is the month.
 95month=
 96command=
 97until test $month
 98do
 99  shift
100  # Add another shift to the command.
101  command="$command shift;"
102  case $1 in
103    Jan) month=January; nummonth=1;;
104    Feb) month=February; nummonth=2;;
105    Mar) month=March; nummonth=3;;
106    Apr) month=April; nummonth=4;;
107    May) month=May; nummonth=5;;
108    Jun) month=June; nummonth=6;;
109    Jul) month=July; nummonth=7;;
110    Aug) month=August; nummonth=8;;
111    Sep) month=September; nummonth=9;;
112    Oct) month=October; nummonth=10;;
113    Nov) month=November; nummonth=11;;
114    Dec) month=December; nummonth=12;;
115  esac
116done
117
118# Get the extended ls output of the file or directory.
119set dummy x`eval "$ls_command \"\$save_arg1\""`
120
121# Remove all preceding arguments
122eval $command
123
124# Because of the dummy argument above, month is in $2.
125#
126# On a POSIX system, we should have
127#
128# $# = 5
129# $1 = file size
130# $2 = month
131# $3 = day
132# $4 = year or time
133# $5 = filename
134#
135# On Darwin 7.7.0 and 7.6.0, we have
136#
137# $# = 4
138# $1 = day
139# $2 = month
140# $3 = year or time
141# $4 = filename
142
143# Get the month.
144case $2 in
145  Jan) month=January; nummonth=1;;
146  Feb) month=February; nummonth=2;;
147  Mar) month=March; nummonth=3;;
148  Apr) month=April; nummonth=4;;
149  May) month=May; nummonth=5;;
150  Jun) month=June; nummonth=6;;
151  Jul) month=July; nummonth=7;;
152  Aug) month=August; nummonth=8;;
153  Sep) month=September; nummonth=9;;
154  Oct) month=October; nummonth=10;;
155  Nov) month=November; nummonth=11;;
156  Dec) month=December; nummonth=12;;
157esac
158
159case $3 in
160  ???*) day=$1;;
161  *) day=$3; shift;;
162esac
163
164# Here we have to deal with the problem that the ls output gives either
165# the time of day or the year.
166case $3 in
167  *:*) set `date`; eval year=\$$#
168       case $2 in
169	 Jan) nummonthtod=1;;
170	 Feb) nummonthtod=2;;
171	 Mar) nummonthtod=3;;
172	 Apr) nummonthtod=4;;
173	 May) nummonthtod=5;;
174	 Jun) nummonthtod=6;;
175	 Jul) nummonthtod=7;;
176	 Aug) nummonthtod=8;;
177	 Sep) nummonthtod=9;;
178	 Oct) nummonthtod=10;;
179	 Nov) nummonthtod=11;;
180	 Dec) nummonthtod=12;;
181       esac
182       # For the first six month of the year the time notation can also
183       # be used for files modified in the last year.
184       if (expr $nummonth \> $nummonthtod) > /dev/null;
185       then
186	 year=`expr $year - 1`
187       fi;;
188  *) year=$3;;
189esac
190
191# The result.
192echo $day $month $year
193
194# Local Variables:
195# mode: shell-script
196# sh-indentation: 2
197# eval: (add-hook 'write-file-hooks 'time-stamp)
198# time-stamp-start: "scriptversion="
199# time-stamp-format: "%:y-%02m-%02d.%02H"
200# time-stamp-end: "$"
201# End: