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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 DEBIAN

speedy_backend

SPEEDY_BACKEND(1p)														SPEEDY_BACKEND(1p)

NAME

       speedy_backend - the backend process for a persistent Perl interpreter

SYNOPSIS

       none ; this program is not meant to be called directly.

DESCRIPTION

       speedy, short for SpeedyCGI, is a way to run perl scripts persistently, which can make them run much more quickly.

       After the script is initially run, instead of exiting, the perl interpreter is kept running inside a backend process, speedy_backend.  Dur-
       ing subsequent runs, this interpreter is used to handle new executions instead of starting a new perl interpreter each time.  A	very  fast
       frontend  program, speedy, written in C, is executed for each request.  This fast frontend then contacts the persistent Perl process, which
       is usually already running, to do the work and return the results.

       Each perl script runs in its own Unix process, so one perl script can't interfere with another.	Command line options can also be  used	to
       deal with programs that have memory leaks or other problems that might keep them from otherwise running persistently.

       The speedy front end connects to the back end process, speedy_backend, via a Unix socket in /tmp.  A queue is kept in a shared file in /tmp
       that holds an entry for each process.  In that queue are the pids of the perl processes waiting for  connections.   The	frontend  pulls  a
       process	out  of this queue, connects to its socket, sends over the environment and argv, and then uses this socket for stdin/stdout to the
       perl process.

FILES

       /tmp/speedy* A unix socket used to connect to the frontend process.

AUTHOR

	       Sam Horrocks
	       http://daemoninc.com
	       sam@daemoninc.com

NOTES

       This manual page was created by Niko Tyni <ntyni@iki.fi> for Debian GNU/Linux, because the original program does not have one. It is  based
       on the original and more complete CGI::SpeedyCGI(3pm) manual page.

SEE ALSO

       perl(1), CGI::SpeedyCGI(3pm), speedy(1)

																SPEEDY_BACKEND(1p)
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