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e9a910b33c
i currently use the output of sha512sum in several places of xbmk, which is a bit unreliable in case output changes. other cases where i use util outputs in variables are probably reliable, because i'm using mostly posix utilities in those. to mitigate this, i now import suckless sbase, which has a reasonable sha512sum implementation. *every* binary it builds is being placed in build.list, because i'll probably start using more of them. for example, i may start modifying the "date" implementation, adding the GNU-specific options that i need as mentioned on init.sh i'm importing it in util/ because the sha512sum util is needed for verifying project sources, so if sbase itself is a "project source", that means we can into a chicken and egg bootstrapping problem. this is sbase at revision: 055cc1ae1b3a13c3d8f25af0a4a3316590efcd48 Signed-off-by: Leah Rowe <leah@libreboot.org>
70 lines
1.4 KiB
Groff
70 lines
1.4 KiB
Groff
.Dd October 8, 2015
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.Dt CUT 1
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.Os sbase
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.Sh NAME
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.Nm cut
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.Nd extract columns of data
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.Sh SYNOPSIS
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.Nm
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.Fl b Ar list
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.Op Fl n
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.Op Ar file ...
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.Nm
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.Fl c Ar list
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.Op Ar file ...
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.Nm
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.Fl f Ar list
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.Op Fl d Ar delim
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.Op Fl s
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.Op Ar file ...
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.Sh DESCRIPTION
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.Nm
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out bytes, characters or delimited fields from each line of
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.Ar file
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and write to stdout.
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.Pp
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If no
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.Ar file
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is given or
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.Ar file
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is '-',
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.Nm
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reads from stdin.
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.Pp
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.Ar list
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is a comma or space separated list of numbers and ranges starting
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from 1.
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Ranges have the form 'N-M'. If N or M is missing, beginning or end
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of line is assumed.
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Numbers and ranges may be repeated, overlapping and in any order.
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.Pp
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Selected input is written in the same order it is read
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and is written exactly once.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl b Ar list | Fl c Ar list
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.Ar list
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specifies byte | character positions.
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.It Fl d Ar delim
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Use
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.Ar delim
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as field delimiter, which can be an arbitrary string.
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Default is '\et'.
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.It Fl f Ar list
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.Ar list
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specifies field numbers.
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Lines not containing field delimiters are passed through, unless
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.Fl s
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is specified.
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.It Fl n
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Do not split multibyte characters.
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A character is written when its last byte is selected.
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.It Fl s
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Suppress lines not containing field delimiters.
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.El
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.Sh STANDARDS
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POSIX.1-2013.
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.Pp
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The possibility of separating numbers and ranges with a space and specifying
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multibyte delimiters of arbitrary length is an extension to that specification.
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