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Top Forums Shell Programming and Scripting How to limit the number of running instances of a script? Post 52767 by oti on Friday 25th of June 2004 09:00:40 AM
Old 06-25-2004
How to limit the number of running instances of a script?

I would like to allow only one instance of a script to run at any moment.

I've tried the following solution to count the instances but the result is always the number of running instances plus one and I can't find the problem

Code:
ps -ef | grep $0 | sed '/^$/ d' | sed '/grep/ d' | wc -l

Please help. Thanks!
 

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FLUSH(1)						      General Commands Manual							  FLUSH(1)

NAME
Flush - GTK-based BitTorrent client SYNOPSIS
flush [OPTIONS] [TORRENT_FILE]... DESCRIPTION
Flush is a GTK-based BitTorrent client. You can use it to download files from the BitTorrent network. You can control already running instance, for example, by following commands: flush -o --download-rate-limit=100 flush --start=all FEATURES
* Controlling running instance by command line interface, such as: * Starting/stopping torrents. * Changing download/upload rate limit. * Changing maximum connections limit. * Running many instances with different configs from the same user. * Automatic copying finished downloads to specified directory. * Setting custom download path for each file of the torrent. * Ability to choose torrent file's character set encoding. * Automatic torrents loading from specified directory. * Automatic pausing and removing old torrents. * Temporary pausing and resuming torrents. * Overall and current session statistics. * Creating your own torrent files. * IP filter. OPTIONS
--version Show program version and exit. --help Show help options and exit. --config=DIRECTORY Configuration directory path (default: ~/.flush). --download-rate-limit=SPEED Set download rate limit (KB/s). --upload-rate-limit=SPEED Set upload rate limit (KB/s). --max-uploads=NUMBER Set maximum uploads. --max-connections=NUMBER Set maximum connections. --start={all,downloads,uploads} Start torrents. --stop={all,downloads,uploads} Stop torrents. -o, --only-pass Only pass commands to already running Flush instance. Does not start new instance if it is not running yet. FILES
~/.flush Default configuration directory. BUGS
On startup Flush finds already running instances via DBus session bus. Therefore it is necessary to run Flush in a single session bus (usual in X session bus) to prevent running several instances with one configuration path. Please notice that when you are running Flush from console or by cron, when DISPLAY environment variable is not available, Flush finds already running GUI instance without problems via ${config_path}/dbus_session link, which all GUI instances are creating when they have owned DBus name. This makes it possible to control running Flush GUI instances from cron. AUTHOR
Flush was written by Dmitry Konishchev <konishchev@gmail.com>. This manual page was written by Dmitry Konishchev <konishchev@gmail.com>. Jun 11, 2009 FLUSH(1)
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