Original post is here: eklausmeier.goip.de
1. Problem statement. Print COBOL section names, ideally title-cased. Use a Perl one-liner for this task.
1perl -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 1 Configuration
2 2 Input-Output
3 3 File
4 4 Working-Storage
5 5 A000-Steuer
6 6 A050-Init
7 7 V000-Verarbeitung
8 8 V100-Lein-Lesen
9 9 V900-Schlussarbeit
10 10 V200-Tabellen
11 11 V210-Loesche-Duplikate
12 12 V212-Open-Duplikate
13 13 V213-Fetch-Duplikat
14 14 V214-Close-Duplikate
15 15 V300-Delete-Vertrag
16 16 D710-Commit
17 17 T900-Sqlcode-Check
18 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":
- lower case everything
- 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.
1perl -h
2
3Usage: perl [switches] [--] [programfile] [arguments]
4 -0[octal/hexadecimal] specify record separator (\0, if no argument)
5 -a autosplit mode with -n or -p (splits $_ into @F)
6 -C[number/list] enables the listed Unicode features
7 -c check syntax only (runs BEGIN and CHECK blocks)
8 -d[t][:MOD] run program under debugger or module Devel::MOD
9 -D[number/letters] set debugging flags (argument is a bit mask or alphabets)
10 -e commandline one line of program (several -e's allowed, omit programfile)
11 -E commandline like -e, but enables all optional features
12 -f don't do $sitelib/sitecustomize.pl at startup
13 -F/pattern/ split() pattern for -a switch (//'s are optional)
14 -i[extension] edit <> files in place (makes backup if extension supplied)
15 -Idirectory specify @INC/#include directory (several -I's allowed)
16 -l[octnum] enable line ending processing, specifies line terminator
17 -[mM][-]module execute "use/no module..." before executing program
18 -n assume "while (<>) { ... }" loop around program
19 -p assume loop like -n but print line also, like sed
20 -s enable rudimentary parsing for switches after programfile
21 -S look for programfile using PATH environment variable
22 -t enable tainting warnings
23 -T enable tainting checks
24 -u dump core after parsing program
25 -U allow unsafe operations
26 -v print version, patchlevel and license
27 -V[:configvar] print configuration summary (or a single Config.pm variable)
28 -w enable many useful warnings
29 -W enable all warnings
30 -x[directory] ignore text before #!perl line (optionally cd to directory)
31 -X disable all warnings
32
33Run 'perldoc perl' for more help with Perl.