10564b1175
groff 1.23.0 added .MR to its -man macro package. The NEWS file states
that the inclusion of the macro "was prompted by its introduction to
Plan 9 from User Space's troff in August 2020." From d32deab it seems
that the name for Plan 9 from User Space's implementation was suggested
by groff maintainer G. Brandon Robinson.
Not sure if the intention was to make these definitions compatible, but
it would be nice if they were.
Currently, Plan 9 from User Space's .MR expects its second argument to
be parenthesized. groff's .MR does not. This results in extra
parentheses appearing in manual references when viewing Plan 9 from User
Space's manual pages on a system using groff.
84 lines
1.4 KiB
Groff
84 lines
1.4 KiB
Groff
.TH HIST 1
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.SH NAME
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hist, history \- print file names from the dump
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.SH SYNOPSIS
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.B hist
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[
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.B -vdu
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] [
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.B -s
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.I yyyymmdd
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]
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.I files ...
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.SH DESCRIPTION
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.I Hist
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prints the names, dates, and sizes of all versions of the named
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.IR files ,
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looking backwards in time,
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stored in the dump file system.
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If the file exists in the main tree, the first line of output will be its current state.
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For example,
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.IP
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.EX
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hist ~rsc/.bash_history
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.EE
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.PP
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produces
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.IP
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.EX
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.nf
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May 19 16:11:37 EDT 2005 /home/am3/rsc/.bash_history 6175
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May 18 23:32:16 EDT 2005 /dump/am/2005/0519/home/am3/rsc/.bash_history 5156
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May 17 23:32:31 EDT 2005 /dump/am/2005/0518/home/am3/rsc/.bash_history 5075
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May 16 07:53:47 EDT 2005 /dump/am/2005/0517/home/am3/rsc/.bash_history 5065
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.fi
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.EE
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.PP
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The
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.B -v
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option enables verbose debugging printout.
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.PP
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The
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.B -d
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option causes
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.MR diff 1
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.B -c
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to be run for each adjacent pair of dump files, while
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.B -b
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runs
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.IR diff
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.BR -cb .
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.PP
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The
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.B -u
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option causes times to be printed in GMT (UT) rather than local time.
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.PP
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Finally, the
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.B -s
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option
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sets the starting (most recent) date for the output.
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.SH EXAMPLES
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.PP
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Examine changes in block.c:
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.IP
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.EX
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hist -d block.c
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.EE
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.SH FILES
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.TF /dump
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.TP
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.B /dump
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by convention, root of dump file system
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.PD
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.SH SOURCE
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.B \*9/src/cmd/hist.c
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.SH SEE ALSO
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.MR yesterday 1 ,
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.MR vbackup 8
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.SH BUGS
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Should be called
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.IR history ,
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but
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that name is taken by
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.MR sh 1 .
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