User talk:Aks

Welcome to Rosetta Code! (And nice use of the mylang template, BTW...) You can visit my userpage to see who I am, but I'm not particularly visible these days; Most of my involvement is now related to the underlying server and software. I notice you're familiar with PDP and UNIVAC assembler. I haven't learned much about these; I'd love to see how their ISAs and VMs relate to more recent and familiar ones, but I don't think we yet have many tasks suitable for such comparisons. --Michael Mol 09:15, 15 September 2009 (UTC)

rs Unix command?

Hi. Could you tell me where I could find info on the rs Unix command used in the column aligner task? Is it a standard Unix command? Thanks. --Paddy3118 23:43, 7 February 2010 (UTC)

rs man page

<lang sh> $ man rs | cat 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 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 -k 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.

      -cx    Input  columns are delimited by the single character x.  A miss-
             ing 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
             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, is  taken  to
             be N.

      -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
      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 pro-
      grams  (e.g.,  spell, du, file, look, nm, who, and wc(1)) into a conve-
      nient ``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
      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

AUTHOR

      John A. Kunze <jak@ucop.edu>

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) </lang>