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Full Discussion: Script for validation
Top Forums Shell Programming and Scripting Script for validation Post 302844521 by capitanui on Monday 19th of August 2013 10:41:34 AM
Old 08-19-2013
Well it is quite a simple script. But i'm also a begineer and I will explain it for you:

- First we declare a variable VAR that computes the number of processes running from the process listing( ps -ef ) that includes "etl" in their name (by using command substitution on bash ` .. `)
Here we use grep -v grep to exclude the search itsel since a new process will be spawned for grep 'etl' and we don't want this to be counted.
Then we count the remaining lines by using wc -l
At this point our VAR variable will hold the number of processes running.

- We check if the number of process obtained is lower than 1...basically meaning that is 0 which tell us that no process is running.

- If this is true than we send an email, if not we do nothing.

Hope it helps you to understand it better now.
 
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PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME
pidof -- find the process ID of a running program. SYNOPSIS
pidof [-s] [-c] [-n] [-x] [-o omitpid[,omitpid..]] [-o omitpid[,omitpid..]..] program [program..] DESCRIPTION
Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead. OPTIONS
-s Single shot - this instructs the program to only return one pid. -c Only return process ids that are running with the same root directory. This option is ignored for non-root users, as they will be unable to check the current root directory of processes they do not own. -n Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS. Instead of using this option the the variable PIDOF_NETFS may be set and exported. -x Scripts too - this causes the program to also return process id's of shells running the named scripts. -o omitpid Tells pidof to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro- gram, in other words the calling shell or shell script. EXIT STATUS
0 At least one program was found with the requested name. 1 No program was found with the requested name. NOTES
pidof is actually the same program as killall5; the program behaves according to the name under which it is called. When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs. Note that that the executable name of running processes is calculated with readlink(2), so symbolic links to executables will also match. SEE ALSO
shutdown(8), init(8), halt(8), reboot(8), killall5(8) AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl 01 Sep 1998 PIDOF(8)

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