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Full Discussion: Monitoring a file - Basic Bash Question
Top Forums Shell Programming and Scripting Monitoring a file - Basic Bash Question Post 302414704 by Nolan- on Tuesday 20th of April 2010 08:17:42 PM
Old 04-20-2010
Java Monitoring a file - Basic Bash Question
*This is not homework I am new to UNIX and want to try this Monitoring a file demo*
*If this is the wrong forum please move it - im new to the forums*

$1 = the file to be monitored
$2 = the time for the file to sleep

If the file gets changed (using -nt) it will send my username mail saying its changed it. The problem im having is it goes into an endless loop, im just learning the while loop so im guessing its that. Also I dont understand the whole mail code - how do I input subject and stuff.

Code:
#!/bin/bash
if [ $# -eq 0 ] ; then
    echo "enter <file> <time>"
exit 1
fi

if [ ! -e $1 ] ; then
    echo " please enter an existing file"
exit 2
fi

if [ "$2" = "" ] ; then
    echo " no argument 2"
exit 3
fi

if [ $2 -lt 10 ] ; then 
    echo " please enter a number higher than 10"
exit 4
fi

while [ $2 -ge 10 ] ; do
if [ $1 -nt ] ; then
    sleep $2
    mail $LOGNAME
else
    echo "file unchanged"
fi
done
exit 0




 

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LEARN ABOUT NETBSD

rpc.statd

RPC.STATD(8)						    BSD System Manager's Manual 					      RPC.STATD(8)

NAME

     rpc.statd -- host status monitoring daemon

SYNOPSIS

     rpc.statd [-d]

DESCRIPTION

     rpc.statd is a daemon which co-operates with rpc.statd daemons on other hosts to provide a status monitoring service.  The daemon accepts
     requests from programs running on the local host (typically, rpc.lockd(8), the NFS file locking daemon) to monitor the status of specified
     hosts.  If a monitored host crashes and restarts, the remote daemon will notify the local daemon, which in turn will notify the local pro-
     gram(s) which requested the monitoring service.  Conversely, if this host crashes and restarts, when rpc.statd restarts, it will notify all
     of the hosts which were being monitored at the time of the crash.

     Options and operands available for rpc.statd :

     -d      The -d option causes debugging information to be written to syslog, recording all RPC transactions to the daemon.	These messages are
	     logged with level LOG_DEBUG and facility LOG_DAEMON.  Error conditions are logged irrespective of this option, using level LOG_ERR.

     The rpc.statd daemon must NOT be invoked by inetd(8) because the protocol assumes that the daemon will run from system start time.  Instead,
     it should be configured in rc.conf(5) to run at system startup.

FILES

     /var/db/statd.status	     non-volatile record of currently monitored hosts.
     /usr/include/rpcsvc/sm_inter.x  RPC protocol specification used by local applications to register monitoring requests.

SEE ALSO

     syslog(3), rc.conf(5), rpc.lockd(8)

STANDARDS

     The implementation is based on the specification in X/Open CAE Specification C218, "Protocols for X/Open PC Interworking: XNFS, Issue 4",
     ISBN 1 872630 66 9

HISTORY

     A version of rpc.statd appeared in SunOS 4.

BUGS

     There is no means for the daemon to tell when a monitored host has disappeared permanently (e.g., catastrophic hardware failure), as opposed
     to transient failure of the host or an intermediate router.  At present, it will retry notification attempts at frequent intervals for 10
     minutes, then hourly, and finally gives up after 24 hours.

     The protocol requires that symmetric monitor requests are made to both the local and remote daemon in order to establish a monitored rela-
     tionship.	This is convenient for the NFS locking protocol, but probably reduces the usefulness of the monitoring system for other applica-
     tions.

     The current implementation uses more than 1Kbyte per monitored host in the status file (and also in VM).  This may be inefficient for NFS
     servers with large numbers of clients.

BSD
								September 19, 1995							       BSD
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