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.TH CUT 1 "Apr 29, 1999"
.SH NAME
cut \- cut out selected fields of each line of a file
.SH SYNOPSIS
.LP
.nf
\fBcut\fR \fB-b\fR \fIlist\fR [\fB-n\fR] [\fIfile\fR]...
.fi

.LP
.nf
\fBcut\fR \fB-c\fR \fIlist\fR [\fIfile\fR]...
.fi

.LP
.nf
\fBcut\fR \fB-f\fR \fIlist\fR [\fB-d\fR \fIdelim\fR] [\fB-s\fR] [\fIfile\fR]...
.fi

.SH DESCRIPTION
.sp
.LP
Use the \fBcut\fR utility 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 \fIlist\fR can be fixed length, that is,
character positions as on a punched card (\fB-c\fR option) or the length can
vary from line to line and be marked with a field delimiter character like TAB
(\fB-f\fR option). \fBcut\fR can be used as a filter.
.sp
.LP
Either the \fB-b\fR, \fB-c\fR, or \fB-f\fR option must be specified.
.sp
.LP
Use \fBgrep\fR(1) to make horizontal ``cuts'' (by context) through a file, or
\fBpaste\fR(1) to put files together column-wise (that is, horizontally). To
reorder columns in a table, use \fBcut\fR and \fBpaste\fR.
.SH OPTIONS
.sp
.LP
The following options are supported:
.sp
.ne 2
.na
\fB\fIlist\fR \fR
.ad
.RS 13n
A comma-separated or blank-character-separated list of integer field numbers
(in increasing order), with optional \fB\(mi\fR to indicate ranges (for
instance, \fB1,4,7\fR; \fB1\(mi3,8\fR; \fB\(mi5,10\fR (short for
\fB1\(mi5,10\fR); or \fB3\(mi\fR (short for third through last field)).
.RE

.sp
.ne 2
.na
\fB\fB\fR\fB-b\fR \fIlist\fR \fR
.ad
.RS 13n
The \fIlist\fR following \fB-b\fR specifies byte positions (for instance,
\fB-b1\fR\fB-72\fR would pass the first 72 bytes of each line). When \fB-b\fR
and \fB-n\fR are used together, \fIlist\fR is adjusted so that no multi-byte
character is split.
.RE

.sp
.ne 2
.na
\fB\fB\fR\fB-c\fR \fIlist\fR \fR
.ad
.RS 13n
The \fIlist\fR following \fB-c\fR specifies character positions (for instance,
\fB-c1\fR\fB-72\fR would pass the first 72 characters of each line).
.RE

.sp
.ne 2
.na
\fB\fB\fR\fB-d\fR \fIdelim\fR \fR
.ad
.RS 13n
The character following \fB-d\fR is the field delimiter (\fB-f\fR option only).
Default is \fItab\fR. Space or other characters with special meaning to the
shell must be quoted. \fIdelim\fR can be a multi-byte character.
.RE

.sp
.ne 2
.na
\fB\fB\fR\fB-f\fR \fIlist\fR \fR
.ad
.RS 13n
The \fIlist\fR following \fB-f\fR is a list of fields assumed to be separated
in the file by a delimiter character (see \fB-d\fR ); for instance,
\fB-f1\fR\fB,7\fR copies the first and seventh field only. Lines with no field
delimiters will be passed through intact (useful for table subheadings), unless
\fB-s\fR is specified.
.RE

.sp
.ne 2
.na
\fB\fB-n\fR \fR
.ad
.RS 13n
Do not split characters. When \fB-b\fR \fIlist\fR and \fB-n\fR are used
together, \fIlist\fR is adjusted so that no multi-byte character is split.
.RE

.sp
.ne 2
.na
\fB\fB-s\fR \fR
.ad
.RS 13n
Suppresses lines with no delimiter characters in case of \fB-f\fR option.
Unless specified, lines with no delimiters will be passed through untouched.
.RE

.SH OPERANDS
.sp
.LP
The following operands are supported:
.sp
.ne 2
.na
\fB\fIfile\fR \fR
.ad
.RS 9n
A path name of an input file. If no \fIfile\fR operands are specified, or if a
\fIfile\fR operand is \fB\(mi\fR, the standard input will be used.
.RE

.SH USAGE
.sp
.LP
See \fBlargefile\fR(5) for the description of the behavior of \fBcut\fR when
encountering files greater than or equal to 2 Gbyte (2^31 bytes).
.SH EXAMPLES
.LP
\fBExample 1 \fRMapping user IDs
.sp
.LP
A mapping of user \fBIDs\fR to names follows:

.sp
.in +2
.nf
example% \fBcut -d: -f1,5 /etc/passwd\fR
.fi
.in -2
.sp

.LP
\fBExample 2 \fRSetting current login name
.sp
.LP
To set \fBname\fR to current login name:

.sp
.in +2
.nf
example$ \fBname=\(gawho am i | cut -f1 -d' '\(ga\fR
.fi
.in -2
.sp

.SH ENVIRONMENT VARIABLES
.sp
.LP
See \fBenviron\fR(5) for descriptions of the following environment variables
that affect the execution of \fBcut\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.SH EXIT STATUS
.sp
.LP
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR \fR
.ad
.RS 7n
All input files were output successfully.
.RE

.sp
.ne 2
.na
\fB\fB>0\fR \fR
.ad
.RS 7n
An error occurred.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	Standard
.TE

.SH SEE ALSO
.sp
.LP
\fBgrep\fR(1), \fBpaste\fR(1), \fBattributes\fR(5), \fBenviron\fR(5),
\fBlargefile\fR(5), \fBstandards\fR(5)
.SH DIAGNOSTICS
.sp
.ne 2
.na
\fB\fBcut: \fR\fB-n\fR\fB may only be used with \fR\fB-b\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: \fR\fB-d\fR\fB may only be used with \fR\fB-f\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: \fR\fB-s\fR\fB may only be used with \fR\fB-f\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: cannot open \fR\fI<file>\fR \fR
.ad
.sp .6
.RS 4n
Either \fIfile\fR cannot be read or does not exist.  If multiple files are
present, processing continues.
.RE

.sp
.ne 2
.na
\fB\fBcut: no delimiter specified\fR \fR
.ad
.sp .6
.RS 4n
Missing \fIdelim\fR on \fB-d\fR option.
.RE

.sp
.ne 2
.na
\fB\fBcut: invalid delimiter\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: no \fIlist\fR\fR\fB specified\fR \fR
.ad
.sp .6
.RS 4n
Missing \fIlist\fR on \fB-b\fR, \fB-c\fR, or \fB-f\fR option.
.RE

.sp
.ne 2
.na
\fB\fBcut: invalid range specifier\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: too many ranges specified\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: range must be increasing\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: invalid character in range\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: internal error processing input\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: invalid multibyte character\fR \fR
.ad
.sp .6
.RS 4n

.RE

.sp
.ne 2
.na
\fB\fBcut: unable to allocate enough memory\fR \fR
.ad
.sp .6
.RS 4n

.RE