1#!/bin/sh 2# Get modification time of a file or directory and pretty-print it. 3 4scriptversion=2018-03-07.03; # UTC 5 6# Copyright (C) 1995-2020 Free Software Foundation, Inc. 7# written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995 8# 9# This program is free software; you can redistribute it and/or modify 10# it under the terms of the GNU General Public License as published by 11# the Free Software Foundation; either version 2, or (at your option) 12# any later version. 13# 14# This program is distributed in the hope that it will be useful, 15# but WITHOUT ANY WARRANTY; without even the implied warranty of 16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17# GNU General Public License for more details. 18# 19# You should have received a copy of the GNU General Public License 20# along with this program. If not, see <https://www.gnu.org/licenses/>. 21 22# As a special exception to the GNU General Public License, if you 23# distribute this file as part of a program that contains a 24# configuration script generated by Autoconf, you may include it under 25# the same distribution terms that you use for the rest of that program. 26 27# This file is maintained in Automake, please report 28# bugs to <bug-automake@gnu.org> or send patches to 29# <automake-patches@gnu.org>. 30 31if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then 32 emulate sh 33 NULLCMD=: 34 # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which 35 # is contrary to our usage. Disable this feature. 36 alias -g '${1+"$@"}'='"$@"' 37 setopt NO_GLOB_SUBST 38fi 39 40case $1 in 41 '') 42 echo "$0: No file. Try '$0 --help' for more information." 1>&2 43 exit 1; 44 ;; 45 -h | --h*) 46 cat <<\EOF 47Usage: mdate-sh [--help] [--version] FILE 48 49Pretty-print the modification day of FILE, in the format: 501 January 1970 51 52Report bugs to <bug-automake@gnu.org>. 53EOF 54 exit $? 55 ;; 56 -v | --v*) 57 echo "mdate-sh $scriptversion" 58 exit $? 59 ;; 60esac 61 62error () 63{ 64 echo "$0: $1" >&2 65 exit 1 66} 67 68 69# Prevent date giving response in another language. 70LANG=C 71export LANG 72LC_ALL=C 73export LC_ALL 74LC_TIME=C 75export LC_TIME 76 77# Use UTC to get reproducible result. 78TZ=UTC0 79export TZ 80 81# GNU ls changes its time format in response to the TIME_STYLE 82# variable. Since we cannot assume 'unset' works, revert this 83# variable to its documented default. 84if test "${TIME_STYLE+set}" = set; then 85 TIME_STYLE=posix-long-iso 86 export TIME_STYLE 87fi 88 89save_arg1=$1 90 91# Find out how to get the extended ls output of a file or directory. 92if ls -L /dev/null 1>/dev/null 2>&1; then 93 ls_command='ls -L -l -d' 94else 95 ls_command='ls -l -d' 96fi 97# Avoid user/group names that might have spaces, when possible. 98if ls -n /dev/null 1>/dev/null 2>&1; then 99 ls_command="$ls_command -n" 100fi 101 102# A 'ls -l' line looks as follows on OS/2. 103# drwxrwx--- 0 Aug 11 2001 foo 104# This differs from Unix, which adds ownership information. 105# drwxrwx--- 2 root root 4096 Aug 11 2001 foo 106# 107# To find the date, we split the line on spaces and iterate on words 108# until we find a month. This cannot work with files whose owner is a 109# user named "Jan", or "Feb", etc. However, it's unlikely that '/' 110# will be owned by a user whose name is a month. So we first look at 111# the extended ls output of the root directory to decide how many 112# words should be skipped to get the date. 113 114# On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below. 115set x`$ls_command /` 116 117# Find which argument is the month. 118month= 119command= 120until test $month 121do 122 test $# -gt 0 || error "failed parsing '$ls_command /' output" 123 shift 124 # Add another shift to the command. 125 command="$command shift;" 126 case $1 in 127 Jan) month=January; nummonth=1;; 128 Feb) month=February; nummonth=2;; 129 Mar) month=March; nummonth=3;; 130 Apr) month=April; nummonth=4;; 131 May) month=May; nummonth=5;; 132 Jun) month=June; nummonth=6;; 133 Jul) month=July; nummonth=7;; 134 Aug) month=August; nummonth=8;; 135 Sep) month=September; nummonth=9;; 136 Oct) month=October; nummonth=10;; 137 Nov) month=November; nummonth=11;; 138 Dec) month=December; nummonth=12;; 139 esac 140done 141 142test -n "$month" || error "failed parsing '$ls_command /' output" 143 144# Get the extended ls output of the file or directory. 145set dummy x`eval "$ls_command \"\\\$save_arg1\""` 146 147# Remove all preceding arguments 148eval $command 149 150# Because of the dummy argument above, month is in $2. 151# 152# On a POSIX system, we should have 153# 154# $# = 5 155# $1 = file size 156# $2 = month 157# $3 = day 158# $4 = year or time 159# $5 = filename 160# 161# On Darwin 7.7.0 and 7.6.0, we have 162# 163# $# = 4 164# $1 = day 165# $2 = month 166# $3 = year or time 167# $4 = filename 168 169# Get the month. 170case $2 in 171 Jan) month=January; nummonth=1;; 172 Feb) month=February; nummonth=2;; 173 Mar) month=March; nummonth=3;; 174 Apr) month=April; nummonth=4;; 175 May) month=May; nummonth=5;; 176 Jun) month=June; nummonth=6;; 177 Jul) month=July; nummonth=7;; 178 Aug) month=August; nummonth=8;; 179 Sep) month=September; nummonth=9;; 180 Oct) month=October; nummonth=10;; 181 Nov) month=November; nummonth=11;; 182 Dec) month=December; nummonth=12;; 183esac 184 185case $3 in 186 ???*) day=$1;; 187 *) day=$3; shift;; 188esac 189 190# Here we have to deal with the problem that the ls output gives either 191# the time of day or the year. 192case $3 in 193 *:*) set `date`; eval year=\$$# 194 case $2 in 195 Jan) nummonthtod=1;; 196 Feb) nummonthtod=2;; 197 Mar) nummonthtod=3;; 198 Apr) nummonthtod=4;; 199 May) nummonthtod=5;; 200 Jun) nummonthtod=6;; 201 Jul) nummonthtod=7;; 202 Aug) nummonthtod=8;; 203 Sep) nummonthtod=9;; 204 Oct) nummonthtod=10;; 205 Nov) nummonthtod=11;; 206 Dec) nummonthtod=12;; 207 esac 208 # For the first six month of the year the time notation can also 209 # be used for files modified in the last year. 210 if (expr $nummonth \> $nummonthtod) > /dev/null; 211 then 212 year=`expr $year - 1` 213 fi;; 214 *) year=$3;; 215esac 216 217# The result. 218echo $day $month $year 219 220# Local Variables: 221# mode: shell-script 222# sh-indentation: 2 223# eval: (add-hook 'before-save-hook 'time-stamp) 224# time-stamp-start: "scriptversion=" 225# time-stamp-format: "%:y-%02m-%02d.%02H" 226# time-stamp-time-zone: "UTC0" 227# time-stamp-end: "; # UTC" 228# End: 229