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1 | #!/bin/sh |
2 | # Get modification time of a file or directory and pretty-print it. | |
3 | ||
00f6db22 | 4 | scriptversion=2018-03-07.03; # UTC |
422889f9 | 5 | |
00f6db22 | 6 | # Copyright (C) 1995-2018 Free Software Foundation, Inc. |
422889f9 CW |
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 | |
00f6db22 | 20 | # along with this program. If not, see <https://www.gnu.org/licenses/>. |
422889f9 CW |
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 | ||
31 | if 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 | |
38 | fi | |
39 | ||
40 | case $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 | |
47 | Usage: mdate-sh [--help] [--version] FILE | |
48 | ||
49 | Pretty-print the modification day of FILE, in the format: | |
50 | 1 January 1970 | |
51 | ||
52 | Report bugs to <bug-automake@gnu.org>. | |
53 | EOF | |
54 | exit $? | |
55 | ;; | |
56 | -v | --v*) | |
57 | echo "mdate-sh $scriptversion" | |
58 | exit $? | |
59 | ;; | |
60 | esac | |
61 | ||
62 | error () | |
63 | { | |
64 | echo "$0: $1" >&2 | |
65 | exit 1 | |
66 | } | |
67 | ||
68 | ||
69 | # Prevent date giving response in another language. | |
70 | LANG=C | |
71 | export LANG | |
72 | LC_ALL=C | |
73 | export LC_ALL | |
74 | LC_TIME=C | |
75 | export LC_TIME | |
76 | ||
00f6db22 CW |
77 | # Use UTC to get reproducible result. |
78 | TZ=UTC0 | |
79 | export TZ | |
80 | ||
422889f9 CW |
81 | # GNU ls changes its time format in response to the TIME_STYLE |
82 | # variable. Since we cannot assume 'unset' works, revert this | |
83 | # variable to its documented default. | |
84 | if test "${TIME_STYLE+set}" = set; then | |
85 | TIME_STYLE=posix-long-iso | |
86 | export TIME_STYLE | |
87 | fi | |
88 | ||
89 | save_arg1=$1 | |
90 | ||
91 | # Find out how to get the extended ls output of a file or directory. | |
92 | if ls -L /dev/null 1>/dev/null 2>&1; then | |
93 | ls_command='ls -L -l -d' | |
94 | else | |
95 | ls_command='ls -l -d' | |
96 | fi | |
97 | # Avoid user/group names that might have spaces, when possible. | |
98 | if ls -n /dev/null 1>/dev/null 2>&1; then | |
99 | ls_command="$ls_command -n" | |
100 | fi | |
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. | |
115 | set x`$ls_command /` | |
116 | ||
117 | # Find which argument is the month. | |
118 | month= | |
119 | command= | |
120 | until test $month | |
121 | do | |
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 $1 in | |
127 | Jan) month=January; nummonth=1;; | |
128 | Feb) month=February; nummonth=2;; | |
129 | Mar) month=March; nummonth=3;; | |
130 | Apr) month=April; nummonth=4;; | |
131 | May) month=May; nummonth=5;; | |
132 | Jun) month=June; nummonth=6;; | |
133 | Jul) month=July; nummonth=7;; | |
134 | Aug) month=August; nummonth=8;; | |
135 | Sep) month=September; nummonth=9;; | |
136 | Oct) month=October; nummonth=10;; | |
137 | Nov) month=November; nummonth=11;; | |
138 | Dec) month=December; nummonth=12;; | |
139 | esac | |
140 | done | |
141 | ||
142 | test -n "$month" || error "failed parsing '$ls_command /' output" | |
143 | ||
144 | # Get the extended ls output of the file or directory. | |
145 | set dummy x`eval "$ls_command \"\\\$save_arg1\""` | |
146 | ||
147 | # Remove all preceding arguments | |
148 | eval $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. | |
170 | case $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;; | |
183 | esac | |
184 | ||
185 | case $3 in | |
186 | ???*) day=$1;; | |
187 | *) day=$3; shift;; | |
188 | esac | |
189 | ||
190 | # Here we have to deal with the problem that the ls output gives either | |
191 | # the time of day or the year. | |
192 | case $3 in | |
193 | *:*) set `date`; eval year=\$$# | |
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;; | |
215 | esac | |
216 | ||
217 | # The result. | |
218 | echo $day $month $year | |
219 | ||
220 | # Local Variables: | |
221 | # mode: shell-script | |
222 | # sh-indentation: 2 | |
00f6db22 | 223 | # eval: (add-hook 'before-save-hook 'time-stamp) |
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224 | # time-stamp-start: "scriptversion=" |
225 | # time-stamp-format: "%:y-%02m-%02d.%02H" | |
00f6db22 | 226 | # time-stamp-time-zone: "UTC0" |
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227 | # time-stamp-end: "; # UTC" |
228 | # End: |