Finding reciprocal columns

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# 15  
Old 02-02-2014
Originally Posted by wisecracker
Hi drl...
I might be missing something here but you have created two versions of the db()
function, one being a NOP, and don't seem to call either of them.
This is a template. The db functions are for debug. If one uses a debug function such as:
db "location: at the first loop"

then one can leave the line in the code and it will either be expanded as a few printf, or the very fast do-very-little command colon ( : ). This can be done simply by inter-changing the function lines. For exmaple, in vi one does ddp, and the lines are swapped.

I didn't happen to use the debug function in this script, but I leave them in there in case I wish to do some debugging later.

In more complex, production scripts, as opposed to demo scripts, one can define the functions in a fashion that might correspond to an option, say -d or --debug.

Best wishes ... cheers, drl

---------- Post updated at 16:11 ---------- Previous update was at 15:51 ----------


More specifically, here is part of a production template that we use here:
#!/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.
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() { : ; }

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

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

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

and running this with and without the debug option:
$ ./sh-production xxx

-- produces nothing, just as one might want without debugging output.
Then with debugging on:
$ ./sh-production -d xxx
 db, Args before getopts, n=1 :xxx:
 db, Args before shift,   n=1 :xxx:
 db, Args after  shift,   n=1 :xxx:
 db,  position - just before main file processing.
 db,  action - processing file xxx.
 db,  position - just after  main file processing.

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