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Top Forums UNIX for Beginners Questions & Answers Loop through directory and print on line Post 303033452 by rbatte1 on Friday 5th of April 2019 01:13:37 PM
Old 04-05-2019
It kind of depends what you want to do with the list. You can certain cut down the effort in your code by not starting lots of processes, but using Variable Substitution (look in the bash manual pages), perhaps like this:-
Code:
for file in *
do
   output="$output ${file%_*_*}"
done

echo $output

This is not unique though. Is that a problem? We can do sneaky things with what bash calls an Associative Array (or a Hash) like this:-
Code:
declare -A output
for file in *
do
   key="${file%_*_*}"
   output["${key}"]=true
done

echo "${!output[@]}"

Okay, so that is not sorted. is that a problem?




I hope that these tricks help.



Robin
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IO::Async::Loop::Glib(3pm)				User Contributed Perl Documentation				IO::Async::Loop::Glib(3pm)

NAME
"IO::Async::Loop::Glib" - use "IO::Async" with Glib or GTK SYNOPSIS
use IO::Async::Loop::Glib; my $loop = IO::Async::Loop::Glib->new(); $loop->add( ... ); ... # Rest of GLib/Gtk program that uses GLib Glib::MainLoop->new->run(); Or $loop->loop_forever(); Or while(1) { $loop->loop_once(); } DESCRIPTION
This subclass of "IO::Async::Loop" uses the "Glib::MainLoop" to perform read-ready and write-ready tests. The appropriate "Glib::IO" sources are added or removed from the "Glib::MainLoop" when notifiers are added or removed from the set, or when they change their "want_writeready" status. The callbacks are called automatically by Glib itself; no special methods on this loop object are required. CONSTRUCTOR
$loop = IO::Async::Loop::Glib->new() This function returns a new instance of a "IO::Async::Loop::Glib" object. It takes no special arguments. METHODS
There are no special methods in this subclass, other than those provided by the "IO::Async::Loop" base class. $count = $loop->loop_once( $timeout ) This method calls the "iteration()" method on the underlying "Glib::MainContext". If a timeout value is supplied, then a Glib timeout will be installed, to interrupt the loop at that time. If Glib indicates that any callbacks were fired, then this method will return 1 (however, it does not mean that any "IO::Async" callbacks were invoked, as there may be other parts of code sharing the Glib main context. Otherwise, it will return 0. SEE ALSO
o Glib - Perl wrappers for the GLib utility and Object libraries o Gtk2 - Perl interface to the 2.x series of the Gimp Toolkit library AUTHOR
Paul Evans <leonerd@leonerd.org.uk> perl v5.14.2 2013-03-01 IO::Async::Loop::Glib(3pm)
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