19th August 2021

Printing COBOL Section Names

1. Problem statement. Print COBOL section names, ideally title-cased. Use a Perl one-liner for this task.

perl -ne 'printf("%3d %s\n",++$i,join("-",map{ucfirst lc $_}split(/\-/,$1))) if /([\-\w]+)\sSECTION\./i' COBOL-Source.cbl

It will print "Working-Storage" as well, as this section is, well, a section.

A typical output might look like this:

  1 Configuration
  2 Input-Output
  3 File
  4 Working-Storage
  5 A000-Steuer
  6 A050-Init
  7 V000-Verarbeitung
  8 V100-Lein-Lesen
  9 V900-Schlussarbeit
 10 V200-Tabellen
 11 V210-Loesche-Duplikate
 12 V212-Open-Duplikate
 13 V213-Fetch-Duplikat
 14 V214-Close-Duplikate
 15 V300-Delete-Vertrag
 16 D710-Commit
 17 T900-Sqlcode-Check
 18 T910-Sqlcode-Ftext

2. How it works. The if statement greps for the sections. In $1 we then have the section name. This often contains words separated by hyphens, e.g., A100-Initialization. The section name is then split at the hyphens using Perl's split() function.

Each substring is then "title-cased":

  1. lower case everything
  2. upper case first character with ucfirst

Finally, everything is concatenated with join.

3. Perl command-line options. Perl has below command-line options, which come handy for one-liners.

perl -h

Usage: perl [switches] [--] [programfile] [arguments]
  -0[octal/hexadecimal] specify record separator (\0, if no argument)
  -a                    autosplit mode with -n or -p (splits $_ into @F)
  -C[number/list]       enables the listed Unicode features
  -c                    check syntax only (runs BEGIN and CHECK blocks)
  -d[t][:MOD]           run program under debugger or module Devel::MOD
  -D[number/letters]    set debugging flags (argument is a bit mask or alphabets)
  -e commandline        one line of program (several -e's allowed, omit programfile)
  -E commandline        like -e, but enables all optional features
  -f                    don't do $sitelib/sitecustomize.pl at startup
  -F/pattern/           split() pattern for -a switch (//'s are optional)
  -i[extension]         edit <> files in place (makes backup if extension supplied)
  -Idirectory           specify @INC/#include directory (several -I's allowed)
  -l[octnum]            enable line ending processing, specifies line terminator
  -[mM][-]module        execute "use/no module..." before executing program
  -n                    assume "while (<>) { ... }" loop around program
  -p                    assume loop like -n but print line also, like sed
  -s                    enable rudimentary parsing for switches after programfile
  -S                    look for programfile using PATH environment variable
  -t                    enable tainting warnings
  -T                    enable tainting checks
  -u                    dump core after parsing program
  -U                    allow unsafe operations
  -v                    print version, patchlevel and license
  -V[:configvar]        print configuration summary (or a single Config.pm variable)
  -w                    enable many useful warnings
  -W                    enable all warnings
  -x[directory]         ignore text before #!perl line (optionally cd to directory)
  -X                    disable all warnings
Run 'perldoc perl' for more help with Perl.

Categories: Programming
Tags: COBOL, Perl
Author: Elmar Klausmeier