#!/usr/bin/env bash

# @(#) s1	Demonstrate msort custom collating sequence.
# http://billposer.org/Software/msort.html

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
edges() { local _f _n _l;: ${1?"edges: need file"}; _f=$1;_l=$(wc -l $_f);
  head -${_n:=3} $_f ; pe "--- ( $_l: lines total )" ; tail -$_n $_f ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C msort

FILE=${1-data1}

pl " Input data file $FILE:"
cat $FILE

pl " Results, default collating sequence:"
msort -l -q -w $FILE

pl " Results, custom collating sequence:"
msort -l -q -w -s collating-sequence.txt $FILE

pl " Custom: collating-sequence.txt:"
cat collating-sequence.txt

exit 0

% ./s1

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 5.0.8 (lenny) 
bash GNU bash 3.2.39
msort 8.44

-----
 Input data file data1:
H:\FileList\A\E\F\G\newCppFile.cpp
H:\FileList\header01.h
H:\FileList\B\nextCppFile.cpp

-----
 Results, default collating sequence:
H:\FileList\A\E\F\G\newCppFile.cpp
H:\FileList\B\nextCppFile.cpp
H:\FileList\header01.h

-----
 Results, custom collating sequence:
H:\FileList\header01.h
H:\FileList\A\E\F\G\newCppFile.cpp
H:\FileList\B\nextCppFile.cpp

-----
 Custom: collating-sequence.txt:
a
b
c
d
e
f
g
h
A
B