Shell script for generating HTML out put

Question

The following script is generating the desired out put but not redirecting the result to /home/myuser/slavedelay.html

#!/bin/bash

host=<ip>
echo $host
user=usr1
password=mypass
threshold=300
statusok=OK
statuscritical=CRITICAL

for i in ert7 ert9
do
echo "<html>" > /home/myuser/slavedelay.html

if [ "$i" == "ert7" ]; then
        slvdelay=`mysql  -u$user -p$password -h<ip> -S /backup/mysql/mysql.sock -e 'show slave status\G' | grep Seconds_Behind_Master | sed -e 's/ *Seconds_Behind_Master: //'`
         if [ $slvdelay -ge $threshold ]; then
                echo "<tr><td>$i</td><td>CRITICAL</td>"  >> /home/myuser/slavedelay.html
                echo "<tr><td>$i</td><td>CRITICAL</td>" 
        else
                echo "<tr><td>$i</td><td>OK</td>"  >> /home/myuser/slavedelay.html
                echo "<tr><td>$i</td><td>OK</td>"
         fi
fi
done
echo "</html>" >> /home/myuser/slavedelay.html

If I cat the output file /home/myuser/slavedelay.html it gives.

<html>
</html>

Execution result :

sh slave_delay.sh 
<tr><td>sdb7</td><td>OK</td>

Put the outout file name in a variable so you're sure you don't have a typo in it (I'm guessing you edited it before posting and that could be the issue). — Mat
– Mat, Commented Sep 1, 2012 at 9:21
Tried still the same issue.. documentroot=/home/myuser/slavedelay.html, everywhere the documentroot has replaced with file path — user1638016
– user1638016, Commented Sep 1, 2012 at 9:29

Barmar · Accepted Answer · 2012-09-01 09:39:16Z

Each time through the loop you're emptying the output file because of the command

echo "<html>" > /home/myuser/slavedelay.html

So the first iteration writes the <tr> row to the file, then the next iteration overwrites the file and doesn't write those lines because $i isn't ert7.

Change it to:

for i in ert7 ert9
do
if [ "$i" == "ert7" ]; then
        echo "<html>" > /home/myuser/slavedelay.html
        slvdelay=`mysql  -u$user -p$password -h<ip> -S /backup/mysql/mysql.sock -e 'show slave status\G' | grep Seconds_Behind_Master | sed -e 's/ *Seconds_Behind_Master: //'`
         if [ $slvdelay -ge $threshold ]; then
                echo "<tr><td>$i</td><td>CRITICAL</td>"
        else
                echo "<tr><td>$i</td><td>OK</td>"
         fi | tee -a /home/myuser/slavedelay.html
        echo "</html>" >> /home/myuser/slavedelay.html
fi
done

Samson · Accepted Answer · 2012-09-01 09:36:54Z

0

Replace :

if [ "$i" == "ert7" ];

with:

if [ "$i" = "ert7" ];

You use = operator in test also.

edited Sep 1, 2012 at 9:36

answered Sep 1, 2012 at 9:17

Samson

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2 Comments

user1638016 Over a year ago

I tried, But the same result only. In console it is resulting properly. But not redirecting to the output file(/home/myuser/slavedelay.html)

user1638016 Over a year ago

It is a logical error, echo "<html>" > /home/myuser/slavedelay.html is given with in the for loop. instead need to give it before the loop.

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