UNIX for Dummies Questions & Answers

db "location: at the first loop"

#!/usr/bin/env bash

# @(#) s1	Production template.
# $Id: sh-production,v 1.14 2013/11/05 13:37:42 drl Exp drl $

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
#shtidyskip
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
#shtidyskip

# Short circuit for debug -- MUST BE FIRST ARGUMENT.
if [[ $# -gt 0 && "$1" =~ -de*b*u*g* ]]
then
  db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
  shift;
else
  db() { : ; }
fi

db
db "Args before getopts, n=$# :$*:"

# Set foreign to "true" if not at company.
# foreign="true" export PATH="/usr/local/bin:/usr/bin:/bin"
...

$ ./sh-production xxx

$ ./sh-production -d xxx
 db, 
 db, Args before getopts, n=1 :xxx:
 db, Args before shift,   n=1 :xxx:
 db, Args after  shift,   n=1 :xxx:
 db, 
 db,  position - just before main file processing.
 db,  action - processing file xxx.
 db,  position - just after  main file processing.
 db,