Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
RS(1)			FreeBSD	General	Commands Manual			 RS(1)

     rs	-- reshape a data array

     rs	[-[csCS][x] [kKgGw][N] tTeEnyjhHmz] [rows [cols]]

     The rs utility reads the standard input, interpreting each	line as	a row
     of	blank-separated	entries	in an array, transforms	the array according to
     the options, and writes it	on the standard	output.	 With no arguments it
     transforms	stream input into a columnar format convenient for terminal

     The shape of the input array is deduced from the number of	lines and the
     number of columns on the first line.  If that shape is inconvenient, a
     more useful one might be obtained by skipping some	of the input with the
     -k	option.	 Other options control interpretation of the input columns.

     The shape of the output array is influenced by the	rows and cols specifi-
     cations, which should be positive integers.  If only one of them is a
     positive integer, rs computes a value for the other which will accommo-
     date all of the data.  When necessary, missing data are supplied in a
     manner specified by the options and surplus data are deleted.  There are
     options to	control	presentation of	the output columns, including transpo-
     sition of the rows	and columns.

     The following options are available:

     -cx     Input columns are delimited by the	single character x.  A missing
	     x is taken	to be `^I'.

     -sx     Like -c, but maximal strings of x are delimiters.

     -Cx     Output columns are	delimited by the single	character x.  A	miss-
	     ing x is taken to be `^I'.

     -Sx     Like -C, but padded strings of x are delimiters.

     -t	     Fill in the rows of the output array using	the columns of the
	     input array, that is, transpose the input while honoring any rows
	     and cols specifications.

     -T	     Print the pure transpose of the input, ignoring any rows or cols

     -kN     Ignore the	first N	lines of input.

     -KN     Like -k, but print	the ignored lines.

     -gN     The gutter	width (inter-column space), normally 2,	is taken to be

     -GN     The gutter	width has N percent of the maximum column width	added
	     to	it.

     -e	     Consider each line	of input as an array entry.

     -n	     On	lines having fewer entries than	the first line,	use null
	     entries to	pad out	the line.  Normally, missing entries are taken
	     from the next line	of input.

     -y	     If	there are too few entries to make up the output	dimensions,
	     pad the output by recycling the input from	the beginning.	Nor-
	     mally, the	output is padded with blanks.

     -h	     Print the shape of	the input array	and do nothing else.  The
	     shape is just the number of lines and the number of entries on
	     the first line.

     -H	     Like -h, but also print the length	of each	line.

     -j	     Right adjust entries within columns.

     -wN     The width of the display, normally	80, is taken to	be the posi-
	     tive integer N.

     -m	     Do	not trim excess	delimiters from	the ends of the	output array.

     -z	     Adapt column widths to fit	the largest entries appearing in them.

     With no arguments,	rs transposes its input, and assumes one array entry
     per input line unless the first non-ignored line is longer	than the dis-
     play width.  Option letters which take numerical arguments	interpret a
     missing number as zero unless otherwise indicated.

     The rs utility can	be used	as a filter to convert the stream output of
     certain programs (e.g., spell(1), du(1), file(1), look(1),	nm(1), who(1),
     and wc(1))	into a convenient ``window'' format, as	in

	   % who | rs

     This function has been incorporated into the ls(1)	program, though	for
     most programs with	similar	output rs suffices.

     To	convert	stream input into vector output	and back again,	use

	   % rs	1 0 | rs 0 1

     A 10 by 10	array of random	numbers	from 1 to 100 and its transpose	can be
     generated with

	   % jot -r 100	| rs 10	10 | tee array | rs -T > tarray

     In	the editor vi(1), a file consisting of a multi-line vector with	9 ele-
     ments per line can	undergo	insertions and deletions, and then be neatly
     reshaped into 9 columns with

	   :1,$!rs 0 9

     Finally, to sort a	database by the	first line of each 4-line field, try

	   % rs	-eC 0 4	| sort | rs -c 0 1

     jot(1), pr(1), sort(1), vi(1)

     The rs utility first appeared in 4.2BSD.

     John A. Kunze

     Handles only two dimensional arrays.

     The algorithm currently reads the whole file into memory, so files	that
     do	not fit	in memory will not be reshaped.

     Fields cannot be defined yet on character positions.

     Re-ordering of columns is not yet possible.

     There are too many	options.

     Multibyte characters are not recognized.

     Lines longer than LINE_MAX	(2048) bytes are not processed and result in
     immediate termination of rs.

FreeBSD	11.1			 April 7, 2015			  FreeBSD 11.1


Want to link to this manual page? Use this URL:

home | help