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Full Discussion: Testing for exit status
Top Forums UNIX for Dummies Questions & Answers Testing for exit status Post 1083 by Neo on Wednesday 7th of February 2001 12:02:46 PM
Old 02-07-2001
This is just an example of some logic:

Code:
ps -ef | grep sendmail | grep -v grep;

if [ $? .eq 1 ] then "restart sendmail;

if [ $? .eq 0 ] then exit;

In the fragment above, the script checks for a running sendmail process. If it returns 'something' (in this case a match on sendmail) the return code is 0. If it returns nothing (no match, process not running) it returns 1. This is how I used to use return codes in shell scripts (similar in C programs, etc.)
 

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LEARN ABOUT NETBSD

mailer.conf

MAILER.CONF(5)						      BSD File Formats Manual						    MAILER.CONF(5)

NAME

     mailer.conf -- configuration file for mailwrapper(8)

DESCRIPTION

     The file /etc/mailer.conf contains a series of lines of the form

     name program [arguments ...]

     The first word of each line is the name of a program invoking mailwrapper(8).  (For example, on a typical system /usr/sbin/sendmail would be
     a symbolic link to mailwrapper(8), as would newaliases(1) and mailq(1).  Thus, name might be ``sendmail'' or ``newaliases'' etc.)

     The second word of each line is the name of the program to actually execute when the first name is invoked.

     The further arguments, if any, are passed to the program, followed by the arguments mailwrapper(8) was called with.

     The file may also contain comment lines, denoted by a '#' mark in the first column of any line.

     The default mailer is postfix(1), which will also start by default (unless specifically disabled via an rc.conf(5) setting) so that locally
     generated mail can be delivered, if the ``sendmail'' setting in /etc/mailer.conf is set to ``/usr/libexec/postfix/sendmail''.

FILES

     /etc/mailer.conf

EXAMPLES

     This example shows how to set up mailer.conf to invoke the postfix(1) program:

	   sendmail	   /usr/libexec/postfix/sendmail
	   mailq	   /usr/libexec/postfix/sendmail
	   newaliases	   /usr/libexec/postfix/sendmail

     This example shows the use of the mini-sendmail package from pkgsrc in place of postfix(1):

	   # Send outgoing mail to a smart relay using mini-sendmail
	   sendmail	   /usr/pkg/sbin/mini-sendmail -srelayhost
	   send-mail	   /usr/pkg/sbin/mini-sendmail -srelayhost

     Note the use of additional arguments.

SEE ALSO

     mail(1), mailq(1), newaliases(1), postfix(1), mailwrapper(8)

     pkgsrc/mail/sendmail, pkgsrc/mail/mini_sendmail

HISTORY

     mailer.conf appeared in NetBSD 1.4.

AUTHORS

     Perry E. Metzger <perry@piermont.com>

BUGS

     The entire reason this program exists is a crock.	Instead, a command for how to submit mail should be standardized, and all the ``behave
     differently if invoked with a different name'' behavior of things like mailq(1) should go away.

BSD
								  April 10, 2010							       BSD
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