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Diffstat (limited to 'doc/mdate-sh')
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1 | #!/bin/sh | ||
2 | # Get modification time of a file or directory and pretty-print it. | ||
3 | |||
4 | scriptversion=2018-03-07.03; # UTC | ||
5 | |||
6 | # Copyright (C) 1995-2018 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 | |||
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: $1" >&2 | ||
65 | exit 1 | ||
66 | } | ||
67 | |||
68 | |||
69 | # Prevent date giving response in another language. | ||
70 | LANG=C | ||
71 | export LANG | ||
72 | LC_ALL=C | ||
73 | export LC_ALL | ||
74 | LC_TIME=C | ||
75 | export LC_TIME | ||
76 | |||
77 | # Use UTC to get reproducible result. | ||
78 | TZ=UTC0 | ||
79 | export TZ | ||
80 | |||
81 | # GNU ls changes its time format in response to the TIME_STYLE | ||
82 | # variable. Since we cannot assume 'unset' works, revert this | ||
83 | # variable to its documented default. | ||
84 | if test "${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 | ||
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: | ||