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authorIndrajith K L2022-12-03 17:00:20 +0530
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+cut(P) cut(P)
+
+
+
+
+
+NAME
+ cut - cut out selected fields of each line of a file
+
+SYNOPSIS
+ cut -b list [-n] [file ...]
+
+ cut -c list [file ...]
+
+ cut -f list [-d delim][-s][file ...]
+
+
+DESCRIPTION
+ The cut utility shall cut out bytes ( -b option), char-
+ acters ( -c option), or character-delimited fields ( -f
+ option) from each line in one or more files, concatenate
+ them, and write them to standard output.
+
+OPTIONS
+ The cut utility shall conform to the Base Definitions
+ volume of IEEE Std 1003.1-2001, Section 12.2, Utility
+ Syntax Guidelines.
+
+ The application shall ensure that the option-argument
+ list (see options -b, -c, and -f below) is a comma-sepa-
+ rated list or <blank>-separated list of positive numbers
+ and ranges. Ranges can be in three forms. The first is
+ two positive numbers separated by a hyphen ( low- high),
+ which represents all fields from the first number to the
+ second number. The second is a positive number preceded
+ by a hyphen (- high), which represents all fields from
+ field number 1 to that number. The third is a positive
+ number followed by a hyphen ( low-), which represents
+ that number to the last field, inclusive. The elements
+ in list can be repeated, can overlap, and can be speci-
+ fied in any order, but the bytes, characters, or fields
+ selected shall be written in the order of the input
+ data. If an element appears in the selection list more
+ than once, it shall be written exactly once.
+
+ The following options shall be supported:
+
+ -b list
+ Cut based on a list of bytes. Each selected byte
+ shall be output unless the -n option is also
+ specified. It shall not be an error to select
+ bytes not present in the input line.
+
+ -c list
+ Cut based on a list of characters. Each selected
+ character shall be output. It shall not be an
+ error to select characters not present in the
+ input line.
+
+ -d delim
+ Set the field delimiter to the character delim.
+ The default is the <tab>.
+
+ -f list
+ Cut based on a list of fields, assumed to be sep-
+ arated in the file by a delimiter character (see
+ -d). Each selected field shall be output. Output
+ fields shall be separated by a single occurrence
+ of the field delimiter character. Lines with no
+ field delimiters shall be passed through intact,
+ unless -s is specified. It shall not be an error
+ to select fields not present in the input line.
+
+ -n Do not split characters. When specified with the
+ -b option, each element in list of the form low-
+ high (hyphen-separated numbers) shall be modified
+ as follows:
+
+ If the byte selected by low is not the first byte
+ of a character, low shall be decremented to
+ select the first byte of the character originally
+ selected by low. If the byte selected by high is
+ not the last byte of a character, high shall be
+ decremented to select the last byte of the char-
+ acter prior to the character originally selected
+ by high, or zero if there is no prior character.
+ If the resulting range element has high equal to
+ zero or low greater than high, the list element
+ shall be dropped from list for that input line
+ without causing an error.
+
+ Each element in list of the form low- shall be treated
+ as above with high set to the number of bytes in the
+ current line, not including the terminating <newline>.
+ Each element in list of the form - high shall be treated
+ as above with low set to 1. Each element in list of the
+ form num (a single number) shall be treated as above
+ with low set to num and high set to num.
+
+ -s Suppress lines with no delimiter characters, when
+ used with the -f option. Unless specified, lines
+ with no delimiters shall be passed through
+ untouched.
+
+
+OPERANDS
+ The following operand shall be supported:
+
+ file A pathname of an input file. If no file operands
+ are specified, or if a file operand is '-' , the
+ standard input shall be used.
+
+
+STDIN
+ The standard input shall be used only if no file oper-
+ ands are specified, or if a file operand is '-' . See
+ the INPUT FILES section.
+
+INPUT FILES
+ The input files shall be text files, except that line
+ lengths shall be unlimited.
+
+ENVIRONMENT VARIABLES
+ The following environment variables shall affect the
+ execution of cut:
+
+ LANG Provide a default value for the internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ LC_ALL If set to a non-empty string value, override the
+ values of all the other internationalization
+ variables.
+
+ LC_CTYPE
+ Determine the locale for the interpretation of
+ sequences of bytes of text data as characters
+ (for example, single-byte as opposed to multi-
+ byte characters in arguments and input files).
+
+ LC_MESSAGES
+ Determine the locale that should be used to
+ affect the format and contents of diagnostic mes-
+ sages written to standard error.
+
+ NLSPATH
+ Determine the location of message catalogs for
+ the processing of LC_MESSAGES .
+
+
+ASYNCHRONOUS EVENTS
+ Default.
+
+STDOUT
+ The cut utility output shall be a concatenation of the
+ selected bytes, characters, or fields (one of the fol-
+ lowing):
+
+
+ "%s\n", <concatenation of bytes>
+
+
+ "%s\n", <concatenation of characters>
+
+
+ "%s\n", <concatenation of fields and field delimiters>
+
+STDERR
+ The standard error shall be used only for diagnostic
+ messages.
+
+OUTPUT FILES
+ None.
+
+EXTENDED DESCRIPTION
+ None.
+
+EXIT STATUS
+ The following exit values shall be returned:
+
+ 0 All input files were output successfully.
+
+ >0 An error occurred.
+
+
+CONSEQUENCES OF ERRORS
+ Default.
+
+ The following sections are informative.
+
+APPLICATION USAGE
+ Earlier versions of the cut utility worked in an envi-
+ ronment where bytes and characters were considered
+ equivalent (modulo <backspace> and <tab> processing in
+ some implementations). In the extended world of multi-
+ byte characters, the new -b option has been added. The
+ -n option (used with -b) allows it to be used to act on
+ bytes rounded to character boundaries. The algorithm
+ specified for -n guarantees that:
+
+
+ cut -b 1-500 -n file > file1
+ cut -b 501- -n file > file2
+
+ ends up with all the characters in file appearing
+ exactly once in file1 or file2. (There is, however, a
+ <newline> in both file1 and file2 for each <newline> in
+ file.)
+
+EXAMPLES
+ Examples of the option qualifier list:
+
+ 1,4,7 Select the first, fourth, and seventh bytes,
+ characters, or fields and field delimiters.
+
+ 1-3,8 Equivalent to 1,2,3,8.
+
+ -5,10 Equivalent to 1,2,3,4,5,10.
+
+ 3- Equivalent to third to last, inclusive.
+
+
+ The low- high forms are not always equivalent when used
+ with -b and -n and multi-byte characters; see the
+ description of -n.
+
+ The following command:
+
+
+ cut -d : -f 1,6 /etc/passwd
+
+ reads the System V password file (user database) and
+ produces lines of the form:
+
+
+ <user ID>:<home directory>
+
+ Most utilities in this volume of IEEE Std 1003.1-2001
+ work on text files. The cut utility can be used to turn
+ files with arbitrary line lengths into a set of text
+ files containing the same data. The paste utility can be
+ used to create (or recreate) files with arbitrary line
+ lengths. For example, if file contains long lines:
+
+
+ cut -b 1-500 -n file > file1
+ cut -b 501- -n file > file2
+
+ creates file1 (a text file) with lines no longer than
+ 500 bytes (plus the <newline>) and file2 that contains
+ the remainder of the data from file. (Note that file2 is
+ not a text file if there are lines in file that are
+ longer than 500 + {LINE_MAX} bytes.) The original file
+ can be recreated from file1 and file2 using the command:
+
+
+ paste -d "\0" file1 file2 > file
+
+RATIONALE
+ Some historical implementations do not count
+ <backspace>s in determining character counts with the -c
+ option. This may be useful for using cut for processing
+ nroff output. It was deliberately decided not to have
+ the -c option treat either <backspace>s or <tab>s in any
+ special fashion. The fold utility does treat these char-
+ acters specially.
+
+ Unlike other utilities, some historical implementations
+ of cut exit after not finding an input file, rather than
+ continuing to process the remaining file operands. This
+ behavior is prohibited by this volume of
+ IEEE Std 1003.1-2001, where only the exit status is
+ affected by this problem.
+
+ The behavior of cut when provided with either mutually-
+ exclusive options or options that do not work logically
+ together has been deliberately left unspecified in favor
+ of global wording in Utility Description Defaults .
+
+ The OPTIONS section was changed in response to IEEE PASC
+ Interpretation 1003.2 #149. The change represents his-
+ torical practice on all known systems. The original
+ standard was ambiguous on the nature of the output.
+
+ The list option-arguments are historically used to
+ select the portions of the line to be written, but do
+ not affect the order of the data. For example:
+
+
+ echo abcdefghi | cut -c6,2,4-7,1
+
+ yields "abdefg" .
+
+ A proposal to enhance cut with the following option:
+
+ -o Preserve the selected field order. When this
+ option is specified, each byte, character, or
+ field (or ranges of such) shall be written in the
+ order specified by the list option-argument, even
+ if this requires multiple outputs of the same
+ bytes, characters, or fields.
+
+
+ was rejected because this type of enhancement is outside
+ the scope of the IEEE P1003.2b draft standard.
+
+FUTURE DIRECTIONS
+ None.
+
+SEE ALSO
+ grep , paste , Parameters and Variables
+
+COPYRIGHT
+ Portions of this text are reprinted and reproduced in
+ electronic form from IEEE Std 1003.1, 2003 Edition,
+ Standard for Information Technology -- Portable Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute of Electrical and Electronics Engineers, Inc and
+ The Open Group. In the event of any discrepancy between
+ this version and the original IEEE and The Open Group
+ Standard, the original IEEE and The Open Group Standard
+ is the referee document. The original Standard can be
+ obtained online at http://www.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 cut(P)