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└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
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.TH CUT 1
.SH NAME
cut \- cut out selected fields of each line of a file
.SH SYNOPSIS
\fBcut \-c\fP\^list [\|file1 file2 ...]
.br
\fBcut \-f\fP\^list [\fB\-d\fP\|char\|] [\fB\-s\fP] [\|file1 file2 ...]
.SH DESCRIPTION
Use
.I cut\^
to cut out columns from a table or 
fields from each line of a file; in data base parlance, it implements
the projection of a relation.
The fields as specified by
.I list\^
can be fixed length,
i.e., character positions as on a punched card
(\fB\-c\fP option) or the length can vary from line to line
and be marked with a field delimiter character like
.I tab\^
(\fB\-f\fP option).
.I Cut\^
can be used as a filter;
if no files are given, the standard input is used.
.PP
The meanings of the options are:
.br
.TP "\w'\-d\ char\ \ 'u"
.I list\^
A comma-separated 
list of integer field numbers,
with optional \fB\-\fP to indicate ranges
as in the 
.B \-o
option of
.IR nroff / troff
for page ranges;
e.g.,
.BR 1,4,7 ;
.BR 1\-3,8 ;
.B \-5,10
(short for \fB1\-5,10\fP); or
.B 3\-
(short for third through last field).
.TP
\fB\-c\fP\^\fIlist\fP
The
.I list\^
following 
.B \-c
specifies character
positions (e.g.,
.B \-c1\-72
would pass the first 72 characters
of each line).
.TP
\fB\-f\fP\^\fIlist\fP
The \fIlist\fP following 
.B \-f
is a list of fields
assumed to be separated in the file by a delimiter character (see 
.B \-d
);
e.g.,
.B \-f1,7
copies the first and seventh field only.
Lines with no field delimiters will be passed through intact (useful
for table subheadings), unless 
.B \-s
is specified.
.TP
\fB\-d\fP\^\fIchar\fP
The character following 
.B \-d
is the field delimiter
(\c
.B \-f
option only).
Default is
.IR tab .
Space or other characters with special meaning to the shell must be quoted.
.TP
.B \-s
Suppresses lines with no delimiter characters in case of
.B \-f
option.
Unless specified, lines with no delimiters will be passed through untouched.
.PP
Either the
.B \-c
or 
.B \-f
option must be specified.
.SH HINTS
Use
.IR grep (1)
to make horizontal ``cuts''
(by context) through a file, or
.IR paste (1)
to put files together column-wise
(i.e., horizontally).
To reorder columns in a table, use
.I cut\^
and
.IR paste .
.SH EXAMPLES
.TP 2.25i
cut \-d: \-f1,5 /etc/passwd
mapping of user \s-1ID\s0s to names
.TP
name=\*`who am i | cut \-f1 \-d" "\*`
to set 
.B name
to current login
name.
.SH DIAGNOSTICS
.PP
Error messages may come from getopt(3). All error messages contain limits
for line and field lenghts.
.SH SEE ALSO
grep(1),
paste(1).
getopt(3)