portions of each line of a file
utility selects portions of each line (as
specified by list
) from each
and writes them to the standard output.
If no file
arguments are specified, or a file
argument is a single dash (‘-’),
reads from the standard input. The items
specified by list
can be in terms of column
position or in terms of fields delimited by a special character. Column and
field numbering starts from 1; output is in the same order as input, not in
the order selected.
is a comma or whitespace separated set of
numbers and/or number ranges. Number ranges consist of a number, a dash
(‘-’), and a second number which select the fields or columns
from the first number to the second, inclusive. Numbers or number ranges may
be preceded by a dash, which selects all fields or columns from 1 to the first
number. Numbers or number ranges may be followed by a dash, which selects all
fields or columns 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 fields or columns not present in the input line.
The options are as follows:
- The list specifies byte
- The list specifies
- Use the first character of
delim as the field delimiter character.
The default is the ⟨TAB⟩ character.
- The list specifies fields,
separated by the field delimiter character. The selected fields are
output, separated by the field delimiter character.
- Do not split multi-byte characters. A character is written
to standard output if and only if the byte position holding its last byte
- Suppresses lines with no field delimiter characters. Unless
specified, lines with no delimiters are passed through unmodified.
- The character encoding
locale(1). It decides which
byte sequences form characters. If unset or set to “C”,
“POSIX”, or an unsupported value,
-c does the same as
-b, -n has no
effect, and -d uses the first byte of
utility exits 0 if all input files are
output successfully, and >0 if an error occurs.
Extract login names and shells from the system
$ cut -d : -f 1,7 /etc/passwd
Show the names and login times of logged in users:
$ who | cut -c 1-8,18-30
utility is compliant with the
IEEE Std 1003.1-2008