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File: coreutils.info, Node: cut invocation, Next: paste invocation, Up: Operating on fields
8.1 'cut': Print selected parts of lines
========================================
'cut' writes to standard output selected parts of each line of each
input file, or standard input if no files are given or for a file name
of '-'. Synopsis:
cut OPTION... [FILE]...
In the table which follows, the BYTE-LIST, CHARACTER-LIST, and
FIELD-LIST are one or more numbers or ranges (two numbers separated by a
dash) separated by commas. Bytes, characters, and fields are numbered
starting at 1. Incomplete ranges may be given: '-M' means '1-M'; 'N-'
means 'N' through end of line or last field. The list elements can be
repeated, can overlap, and can be specified in any order; but the
selected input is written in the same order that it is read, and is
written exactly once.
The program accepts the following options. Also see *note Common
options::.
'-b BYTE-LIST'
'--bytes=BYTE-LIST'
Select for printing only the bytes in positions listed in
BYTE-LIST. Tabs and backspaces are treated like any other
character; they take up 1 byte. If an output delimiter is
specified, (see the description of '--output-delimiter'), then
output that string between ranges of selected bytes.
'-c CHARACTER-LIST'
'--characters=CHARACTER-LIST'
Select for printing only the characters in positions listed in
CHARACTER-LIST. The same as '-b' for now, but internationalization
will change that. Tabs and backspaces are treated like any other
character; they take up 1 character. If an output delimiter is
specified, (see the description of '--output-delimiter'), then
output that string between ranges of selected bytes.
'-f FIELD-LIST'
'--fields=FIELD-LIST'
Select for printing only the fields listed in FIELD-LIST. Fields
are separated by a TAB character by default. Also print any line
that contains no delimiter character, unless the '--only-delimited'
('-s') option is specified.
Note 'awk' supports more sophisticated field processing, and by
default will use (and discard) runs of blank characters to separate
fields, and ignore leading and trailing blanks.
awk '{print $2}' # print the second field
awk '{print $NF-1}' # print the penultimate field
awk '{print $2,$1}' # reorder the first two fields
In the unlikely event that 'awk' is unavailable, one can use the
'join' command, to process blank characters as 'awk' does above.
join -a1 -o 1.2 - /dev/null # print the second field
join -a1 -o 1.2,1.1 - /dev/null # reorder the first two fields
'-d INPUT_DELIM_BYTE'
'--delimiter=INPUT_DELIM_BYTE'
With '-f', use the first byte of INPUT_DELIM_BYTE as the input
fields separator (default is TAB).
'-n'
Do not split multi-byte characters (no-op for now).
'-s'
'--only-delimited'
For '-f', do not print lines that do not contain the field
separator character. Normally, any line without a field separator
is printed verbatim.
'--output-delimiter=OUTPUT_DELIM_STRING'
With '-f', output fields are separated by OUTPUT_DELIM_STRING. The
default with '-f' is to use the input delimiter. When using '-b'
or '-c' to select ranges of byte or character offsets (as opposed
to ranges of fields), output OUTPUT_DELIM_STRING between
non-overlapping ranges of selected bytes.
'--complement'
This option is a GNU extension. Select for printing the complement
of the bytes, characters or fields selected with the '-b', '-c' or
'-f' options. In other words, do _not_ print the bytes, characters
or fields specified via those options. This option is useful when
you have many fields and want to print all but a few of them.
An exit status of zero indicates success, and a nonzero value
indicates failure.
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