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1 #!/bin/sh

2 # Get modification time of a file or directory and pretty-print it.

4 scriptversion=2018-03-07.03; # UTC

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/>.

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.

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>.

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

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

49 Pretty-print the modification day of FILE, in the format:

50 1 January 1970

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

62 error ()

63 {

64 echo "$0: $1" >&2

65 exit 1

66 }

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

77 # Use UTC to get reproducible result.

78 TZ=UTC0

79 export TZ

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

89 save_arg1=$1

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: