RS(1)                                                       RS(1)


NAME
       rs - reshape a data array



SYNOPSIS
       rs [ -[csCS][x][kKgGw][N]tTeEnyjhHm ] [ 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 stan-
       dard 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  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  specifications,  which should be positive inte-
       gers.  If only one of them is a positive integer, rs  com-
       putes  a value for the other which will accommodate 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 as follows:

       -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 charac-
              ter x.  A missing 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  specifica-
              tions.

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

       -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,



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RS(1)                                                       RS(1)


              is taken to be N.

       -GN    The  gutter width has N percent of the maximum col-
              umn 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.  Normally, 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 positive 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 display width.  Option
       letters which take numerical arguments interpret a missing
       number as zero unless otherwise indicated.

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

              who   |   rs

       This  function  has  been incorporated into the ls(1) pro-
       gram, though for most programs with similar output rs suf-
       fices.

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




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RS(1)                                                       RS(1)


              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 elements 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


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.























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