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Full Discussion: Emulate group-by in shell script
Top Forums Shell Programming and Scripting Emulate group-by in shell script Post 302994500 by durden_tyler on Thursday 23rd of March 2017 02:38:24 PM
Old 03-23-2017
Code:
$
$ cat data.txt
Opeation,Time-Taken
operation1,83621
operation2,72321
operation3,13288
operation2,12312
operation1,12321
operation2,45455
operation2,42543
operation1,87934
operation4,94865
operation5,27383
operation6,322
operation6,93483
operation7,3223
$
$ cat -n group_data.sh
     1  #!/usr/bin/bash
     2  header="y"
     3  while read line
     4  do
     5      if [ ! -z "$header" ] ; then
     6          header=
     7          continue
     8      fi
     9      opr=${line%%,*}
    10      if [ -z "$prev_opr" ] ; then
    11          # set min, max if first data line
    12          min=${line##*,}
    13          max=$min
    14      elif [ "$opr" != "$prev_opr" ] ; then
    15          # if opr changes, print previous line and set min, max
    16          echo "$prev_opr,$min,$max"
    17          min=${line##*,}
    18          max=$min
    19      elif [ "${line##*,}" -gt "$min" ] ; then
    20          # if opr is same, set max if needed
    21          max=${line##*,}
    22      fi
    23      prev_opr=$opr
    24  done <<< "$(sort -t, -k1,1 -k2,2n data.txt)"
    25  echo "$prev_opr,$min,$max"
    26
$
$ ./group_data.sh
operation1,12321,87934
operation2,12312,72321
operation3,13288,13288
operation4,94865,94865
operation5,27383,27383
operation6,322,93483
operation7,3223,3223
$
$

This User Gave Thanks to durden_tyler For This Post:
drl
 

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LEARN ABOUT DEBIAN

fitstopnm

fitstopnm(1)						      General Commands Manual						      fitstopnm(1)

NAME

       fitstopnm - convert a FITS file into a portable anymap

SYNOPSIS

       fitstopnm [-image N] [-noraw] [-scanmax] [-printmax] [-min f] [-max f] [FITSfile]

DESCRIPTION

       Reads  a FITS file as input.  Produces a portable pixmap if the FITS file consists of 3 image planes (NAXIS = 3 and NAXIS3 = 3), a portable
       graymap if the FITS file consists of 2 image planes (NAXIS = 2), or whenever the -image flag is specified.  The	results  may  need  to	be
       flipped top for bottom; if so, just pipe the output through pnmflip -tb.

OPTIONS

       The  -image  option  is for FITS files with three axes.	The assumption is that the third axis is for multiple images, and this option lets
       you select which one you want.

       Flags -min and -max can be used to override the min and max values as read from the FITS header or the image data if no DATAMIN and DATAMAX
       keywords are found.  Flag -scanmax can be used to force the program to scan the data even when DATAMIN and DATAMAX are found in the header.
       If -printmax is specified, the program will just print the min and max values and quit.	Flag -noraw can be used to force  the  program	to
       produce an ASCII portable anymap.

       The program will tell what kind of anymap is writing.  All flags can be abbreviated to their shortest unique prefix.

REFERENCES

       FITS  stands for Flexible Image Transport System.  A full description can be found in Astronomy & Astrophysics Supplement Series 44 (1981),
       page 363.

SEE ALSO

       pnmtofits(1), pgm(5), pnmflip(1)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer, with modifications	by  Daniel  Briggs  (dbriggs@nrao.edu)	and  Alberto  Accomazzi  (alberto@cfa.har-
       vard.edu).

								  20 September 89						      fitstopnm(1)
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