YESTERDAY(1) YESTERDAY(1) NAME yesterday - print file names from the dump SYNOPSIS yesterday [ -abcCdD ] [ -n daysago ] [ -date ] files ... DESCRIPTION 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 prints /n/dump/1992/0317/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. 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 files. -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. Yesterday does not guarantee that the string it prints Page 1 Plan 9 (printed 5/21/24) YESTERDAY(1) YESTERDAY(1) represents an existing file. EXAMPLES 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 mk v.out Find what has changed in the C library since March 1: yesterday -d -0301 /sys/src/libc/port/*.c FILES /n/dump SOURCE /rc/bin/yesterday SEE ALSO history(1), bind(1), diff(1), fs(4). BUGS It's hard to use this command without singing. Page 2 Plan 9 (printed 5/21/24)