RS(1) RS(1)

NAME
       rs - reshape a data array

SYNOPSIS
       rrss [[ -[[ccssCCSS]][[x]][[kkKKggGGww]][[N]]ttTTeeEEnnyyjjhhHHmm ]] [[ rows [[ cols ]] ]]

DESCRIPTION
       Rs  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
       viewing.

       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  inconve-
       nient,  a  more  useful  one  might be obtained by skipping some of the
       input with the -kk option.  Other options control interpretation of  the
       input columns.

       The shape of the output array is influenced by the rows and cols speci-
       fications, 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
       transposition of the rows and columns.

       The options are described below.

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

       -ssx    Like -cc, but maximal strings of x are delimiters.

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

       -SSx    Like -CC, but padded strings of x are delimiters.

       -tt     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.

       -TT     Print the pure transpose of the input, ignoring any rows or cols
              specification.

       -kkN    Ignore the first N lines of input.

       -KKN    Like -kk, but print the ignored lines.

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

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

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

       -nn     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.

       -yy     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.

       -hh     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.

       -HH     Like -hh, but also print the length of each line.

       -jj     Right adjust entries within columns.

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

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

       -zz     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
       display width.  Option letters which take numerical arguments interpret
       a missing number as zero unless otherwise indicated.

EEXXAAMMPPLLEESS
       Rs can be used as a filter to convert the stream output of certain pro-
       grams  (e.g.,  spell, du, file, look, nm, who, and wc(1)) into a conve-
       nient ``window'' format, as in

              wwhhoo   ||   rrss

       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

              rrss   11   00   ||   rrss   00   11

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

              jjoott   -rr   110000   ||   rrss   1100   1100   ||    tteeee    aarrrraayy    ||    rrss
              -TT   >>   ttaarrrraayy

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

              ::11,,$$!!rrss   00   99

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

              rrss   -eeCC   00   44   ||   ssoorrtt   ||   rrss   -cc   00   11


AUTHOR       John A. Kunze 

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

BUGS
       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.



4th Berkeley Distribution      December 30, 1993                         RS(1)