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Full Discussion: Help with shell script to send email once
Top Forums Shell Programming and Scripting Help with shell script to send email once Post 302542327 by zaxxon on Wednesday 27th of July 2011 08:43:49 AM
Old 07-27-2011
Ah ok, so you want to remember which last status it had. Yep you could just create a lock file, that keeps the latest status in it which will be tested against the actual status. Also I would set a lock to avoid running the script more than 1 times. If you stop it with a kill, you will have to manually remove the .lck file - maybe can put a trap in there for this.

I might write it for example like this:
Code:
#!/bin/bash
#
# Skript to check DB status and send an email as warning
#
# Error codes:
# 0     ok
# 1     already running or lock file left over
#
# v1.0, 27.07.11
###################################################################
#set -x

DATE=`date +%Y-%m-%d", "%H:%M:%S`
SNAME=`echo $0| sed 's/^.\///'`
BASE=/home/d3xt3r
LOCKDIR=${BASE}/var/.lock
LOCKFILE=${LOCKDIR}/${SNAME}.lck
STATFILE=${BASE}/var/DB_STAT

MAILTO=d3xt3r@bla.org
INTERVAL=10

if [[ -e $LOCKFILE ]]; then
    echo "Sorry, $SNAME seems to run already; lockfile $LOCKFILE already exists."
    exit 1
else
    touch $LOCKFILE
fi

mailit()
{
    echo "$DATE - $1"
    echo "$DATE - $1"| mail -s "Database status inside..."  $MAILTO
}

writestat()
{
    echo $1 > $2
}

getstat()
{
    #DB_STAT=`ps -ef| grep -v grep| grep ${ORACLE_SID}|grep -c pmon`
    DB_STAT=`ps -ef| grep -v grep| grep -c cron`
}

## Write initial status to file
getstat
case $DB_STAT in
    "0")    writestat DOWN $STATFILE;;
    "1")    writestat UP $STATFILE;;
esac

while :; do
    getstat
    if [[ $DB_STAT > 0 ]]; then
        STAT=UP
        if [[ `cat $STATFILE` == "DOWN" ]]; then
            writestat $STAT $STATFILE
            MSG="Database is $STAT again."
            mailit "$MSG"
        else
            echo "$DATE - Database is $STAT."
        fi
        sleep $INTERVAL
        continue
    else
        STAT=DOWN
        if [[ `cat $STATFILE` == "DOWN" ]]; then
            echo "$DATE - Database is still $STAT."
        else
            writestat $STAT $STATFILE
            MSG="Database is $STAT."
            mailit "$MSG"
        fi
        sleep $INTERVAL
        continue
    fi
done

exit 0

This User Gave Thanks to zaxxon For This Post:
d3xt3r
 

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atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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