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Shell Programming and Scripting
Check if PID exists
Post 302778561 by pamu on Monday 11th of March 2013 08:20:17 AM
03-11-2013
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LEARN ABOUT REDHAT
adsl-connect
ADSL-CONNECT(8) System Manager's Manual ADSL-CONNECT(8) NAME
adsl-connect - Shell script to manage a PPPoE link SYNOPSIS
adsl-connect [config_file] adsl-connect interface user [config_file] DESCRIPTION
adsl-connect is a shell script which manages an ADSL connection using the Roaring Penguin user-space PPPoE client. If you omit con- fig_file, the default file /etc/sysconfig/network-scripts/ifcfg-ppp0 is used. If you supply interface and user, then they override the Ethernet interface and user-name settings in the configuration file. Note that normally, you should not invoke adsl-connect directly. Instead, use adsl-start to bring up the ADSL connection. adsl-connect first reads a configuration file. It then brings up a PPPoE connection. If the connection ever drops, a message is logged to syslog, and adsl-connect re-establishes the connection. In addition, each time the connection is dropped or cannot be established, adsl- connect executes the script /etc/ppp/adsl-lost if it exists and is executable. The shell script adsl-stop causes adsl-connect to break out of its loop, bring the connection down, and exit. TECHNICAL DETAILS
adsl-connect uses the following shell variables from the configuration file: ETH The Ethernet interface connected to the ADSL modem (for example, eth0). USER The ADSL user-id (for example, b1xxnxnx@sympatico.ca). PIDFILE A file in which to write the process-ID of the adsl-connect process (for example, /var/run/pppoe.pid). Two additional files ($PID- FILE.pppd and $PIDFILE.pppoe) hold the process-ID's of the pppd and pppoe processes, respectively. By using different configuration files with different PIDFILE settings, you can manage multiple PPPoE connections. Just specify the con- figuration file as an argument to adsl-start and adsl-stop. AUTHOR
adsl-connect was written by David F. Skoll <dfs@roaringpenguin.com>. The pppoe home page is http://www.roaringpenguin.com/pppoe/. SEE ALSO
pppoe(8), adsl-start(8), adsl-stop(8), pppd(8), pppoe.conf(5), adsl-setup(8), adsl-status(8), pppoe-sniff(8), pppoe-server(8), pppoe- relay(8) 4th Berkeley Distribution 21 February 2000 ADSL-CONNECT(8)