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Full Discussion: Combining two perl commands into one
Top Forums Shell Programming and Scripting Combining two perl commands into one Post 303045491 by bedtime on Friday 27th of March 2020 04:35:52 PM
Old 03-27-2020
Combining two perl commands into one
I made a program that extracts quotes while retaining special inner quotes (in this case an 'x' followed by an apostrophe). The original program is far more complicated than this, but I wanted to make it simple to troubleshoot.


I want to take these two perl commands and have the first command's results be piped into the second commands input but while only running perl once:


Input: ['Say, x'Hix'']
Code:
echo "['Say, x'Hix'']" | perl -lne 'push @a,/\[\N{U+0027}(.*?)(?<!x)\N{U+0027}/g; END{print "@a"};'

Output: Say, x'Hix'

Taking the output of the first command:

Code:
echo "Say, x'Hix'" | perl -pe 's/x\N{U+0027}/\N{U+0027}/g; END{print "@a"};'

Result (proper): Say, 'Hi'



I realise that I could easily just run perl twice and pipe them into eachother, but running perl twice seems inefficient; especially given that this command is ran thousands of times:
Code:
echo "['Say, x'Hix'']" | perl -lne 'push @a,/\[\N{U+0027}(.*?)(?<!x)\N{U+0027}/g; END{print "@a"};' |  perl -pe 's/x\N{U+0027}/\N{U+0027}/g; END{print "@a"};'

I've tried combining both commands in the code below, but it doesn't seem to be taking the output of the first command as input for the second:
Code:
echo "['Say, x'Hix'']" | perl -lne 'push @a,/\[\N{U+0027}(.*?)(?<!x)\N{U+0027}/g; END{print "@a"};' -pe 's/x\N{U+0027}/\N{U+0027}/g; END{print "@a"};'

Result (not what I want):

['Say, 'Hi'']
Say, x'Hix'
Say, x'Hix'


Any ideas?
 

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LEARN ABOUT NETBSD

dh_perl

DH_PERL(1)                                                           Debhelper                                                          DH_PERL(1)

NAME

       dh_perl - calculates Perl dependencies and cleans up after MakeMaker

SYNOPSIS

       dh_perl [debhelperoptions] [-d] [librarydirs...]

DESCRIPTION

       dh_perl is a debhelper program that is responsible for generating the ${perl:Depends} substitutions and adding them to substvars files.

       The program will look at Perl scripts and modules in your package, and will use this information to generate a dependency on perl or
       perlapi. The dependency will be substituted into your package's control file wherever you place the token ${perl:Depends}.

       dh_perl also cleans up empty directories that MakeMaker can generate when installing Perl modules.

OPTIONS

       -d  In some specific cases you may want to depend on perl-base rather than the full perl package. If so, you can pass the -d option to make
           dh_perl generate a dependency on the correct base package. This is only necessary for some packages that are included in the base
           system.

           Note that this flag may cause no dependency on perl-base to be generated at all. perl-base is Essential, so its dependency can be left
           out, unless a versioned dependency is needed.

       -V  By default, scripts and architecture independent modules don't depend on any specific version of perl. The -V option causes the current
           version of the perl (or perl-base with -d) package to be specified.

       library dirs
           If your package installs Perl modules in non-standard directories, you can make dh_perl check those directories by passing their names
           on the command line. It will only check the vendorlib and vendorarch directories by default.

CONFORMS TO

       Debian policy, version 3.8.3

       Perl policy, version 1.20

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Brendan O'Dea <bod@debian.org>

11.1.6ubuntu2                                                       2018-05-10                                                          DH_PERL(1)
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