yesterday man page on Plan9

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       yesterday, diffy - print file names from the dump

       yesterday [ -abcCdDs ] [ -n daysago ] [ -date ] files ...

       diffy [ -abcefmnrw ] files ...

       Yesterday  prints  the  names  of  the files from the most recent dump.
       Since dumps are done early in the morning, yesterday's files are really
       in today's dump.	 For example, if today is March 17, 1992,

	      yesterday /adm/users



       In  fact,  the  implementation is to select the most recent dump in the
       current year, so the dump selected may not be from today.

       When presented with a path of the form /n/fs/path, yesterday will  look
       for dump files of the form /n/fsdump/yyyy/hhmm/path.

       By  default, yesterday prints the names of the dump files corresponding
       to the named files.  The first set of options changes this behavior.

       -a     Run acme(1)'s adiff to compare the dump  files  with  the	 named

       -b     Bind the dump files over the named files.

       -c     Copy the dump files over the named files.

       -C     Copy the dump files over the named files only when they differ.

       -d     Run diff to compare the dump files with the named files.

       -D     Run diff -n to compare the dump files with the named files.

       The date option selects other day's dumps, with a format of 1, 2, 4, 6,
       or 8 digits of the form d, dd, mmdd, yymmdd, or yyyymmdd.

       The -n option selects the dump daysago prior to the current day.

       The -s option selects the most recent  snapshot	instead	 of  the  most
       recent archived dump.  Snapshots may occur more frequently than dumps.

       Yesterday  does	not  guarantee that the string it prints represents an
       existing file.

       Diffy runs diff(1) with the given options to compare  yesterday's  ver‐
       sion of each of the named files with today's.

       Back up to yesterday's MIPS binary of vc:

	      yesterday -c /mips/bin/vc

       Temporarily  back  up  to  March 1's MIPS C library to see if a program
       runs correctly when loaded with it:

	      yesterday -b -0301 /mips/lib/libc.a
	      rm v.out

       Find what has changed in the C library since March 1:

	      yesterday -d -0301 /sys/src/libc/port/*.c

       Find what has changed in the source tree today:

	      diffy -r /sys/src



       history(1), bind(1), diff(1), fs(4).

       It's hard to use this command without singing.

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