Shell Programming and Scripting

#!/usr/bin/env bash

# @(#) s2	Demonstrate group sort, missing textutils.

# Infrastructure details, environment, commands for forum posts. 
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo ; echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
c=$( ps | grep $$ | awk '{print $NF}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p blockwise sort
set -o nounset
echo

FILE=${1-data1}

# If "specimen" does not exist, replace with "cat".
specimen $FILE

echo " Preliminary conditions:"
t1=$( diff $FILE expected-output.txt | wc -l )
echo " About $t1 lines differ."

echo
echo " Results:"
split_at_colchange 1 $FILE |
tee t1 |
blockwise "sort -k2,2" |
tee t2 |
remove_blank_lines > tf

if ! cmp expected-output.txt tf
then
  sdiff -w78 expected-output.txt tf
else 
  echo
  echo " Pass - generated output and expected-output.txt are identical."
  echo
  specimen tf
fi

exit 0

% ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash 3.2.39
blockwise - ( ~/bin/blockwise Sep 29 12:53 )
sort (GNU coreutils) 6.10

Edges: 10 of 23 lines in data1
     1	AAAlkalines	Energizer
     2	AAAlkalines	Energizer
     3	AAAlkalines	Energizer
     4	AAAlkalines	Sunlight
     5	AAAlkalines	Sunlight
   ...
    19	RechargableAAA	Duracell
    20	EmergencyLight	AlFaris
    21	EmergencyLight	AlFaris
    22	EmergencyLight	Geepas
    23	EmergencyLight	Geepas

 Preliminary conditions:
 About 18 lines differ.

 Results:

 Pass - generated output and expected-output.txt are identical.

Edges: 10 of 23 lines in tf
     1	AAAlkalines	Energizer
     2	AAAlkalines	Energizer
     3	AAAlkalines	Energizer
     4	AAAlkalines	Energizer
     5	AAAlkalines	Energizer
   ...
    19	RechargableAAA	Energizer
    20	EmergencyLight	AlFaris
    21	EmergencyLight	AlFaris
    22	EmergencyLight	Geepas
    23	EmergencyLight	Geepas