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.\"     @(#)cut.1	8.1 (Berkeley) 6/6/93

.\" $FreeBSD: releng/12.0/usr.bin/cut/cut.1 322013 2017-08-03 14:35:02Z sevan $

.\"

.Dd August 3, 2017

.Dt CUT 1

.Os

.Sh NAME

.Nm cut

.Nd cut out selected portions of each line of a file

.Sh SYNOPSIS

.Nm

.Fl b Ar list

.Op Fl n

.Op Ar

.Nm

.Fl c Ar list

.Op Ar

.Nm

.Fl f Ar list

.Op Fl w | Fl d Ar delim

.Op Fl s

.Op Ar

.Sh DESCRIPTION

The

.Nm

utility cuts out selected portions of each line (as specified by

.Ar list )

from each

.Ar file

and writes them to the standard output.

If no

.Ar file

arguments are specified, or a file argument is a single dash

.Pq Sq Fl ,

.Nm

reads from the standard input.

The items specified by

.Ar list

can be in terms of column position or in terms of fields delimited

by a special character.

Column and field numbering start from 1.

.Pp

The

.Ar list

option argument

is a comma or whitespace separated set of increasing numbers and/or

number ranges.

Number ranges consist of a number, a dash

.Pq Sq \- ,

and a second number

and select the columns or fields from the first number to the second,

inclusive.

Numbers or number ranges may be preceded by a dash, which selects all

columns or fields from 1 to the last number.

Numbers or number ranges may be followed by a dash, which selects all

columns or fields from the last number to the end of the line.

Numbers and number ranges may be repeated, overlapping, and in any order.

It is not an error to select columns or fields not present in the

input line.

.Pp

The options are as follows:

.Bl -tag -width indent

.It Fl b Ar list

The

.Ar list

specifies byte positions.

.It Fl c Ar list

The

.Ar list

specifies character positions.

.It Fl d Ar delim

Use

.Ar delim

as the field delimiter character instead of the tab character.

.It Fl f Ar list

The

.Ar list

specifies fields, separated in the input by the field delimiter character

(see the

.Fl d

option).

Output fields are separated by a single occurrence of the field delimiter

character.

.It Fl n

Do not split multi-byte characters.

Characters will only be output if at least one byte is selected, and,

after a prefix of zero or more unselected bytes, the rest of the bytes

that form the character are selected.

.It Fl s

Suppress lines with no field delimiter characters.

Unless specified, lines with no delimiters are passed through unmodified.

.It Fl w

Use whitespace (spaces and tabs) as the delimiter.

Consecutive spaces and tabs count as one single field separator.

.El

.Sh ENVIRONMENT

The

.Ev LANG , LC_ALL

and

.Ev LC_CTYPE

environment variables affect the execution of

.Nm

as described in

.Xr environ 7 .

.Sh EXIT STATUS

.Ex -std

.Sh EXAMPLES

Extract users' login names and shells from the system

.Xr passwd 5

file as

.Dq name:shell

pairs:

.Pp

.Dl "cut -d : -f 1,7 /etc/passwd"

.Pp

Show the names and login times of the currently logged in users:

.Pp

.Dl "who | cut -c 1-16,26-38"

.Sh SEE ALSO

.Xr colrm 1 ,

.Xr paste 1

.Sh STANDARDS

The

.Nm

utility conforms to

.St -p1003.2-92 .

.Pp

The

.Fl w

flag is an extension to the specification.

.Sh HISTORY

A

.Nm

command appeared in

.Tn AT&T

System III

.Ux .