<div>
if [ ! grep ... ]; then<br />
<br />
(you need to check first which exist status of grep you're interested in)
</div>


if [ ! grep ... ]; then

(you need to check first which exist status of grep you're interested in)

<div>
grep exit status should be is 0 if selected lines are found and 1 otherwise. &nbsp;in my case when the line &quot;Slave_Running: Yes&quot; not appent in the file I want to enter to the if.<br />
<br />
&gt;&nbsp;if [ ! grep ... ]; then<br />
I add it and it fail on error<br />
<br />
# if grep &quot;Slave_Running: Yes&quot; /home/status.txt &gt;&nbsp;/dev/null; then<br />
if [ ! grep &quot;Slave_Running: Yes&quot; /home/status.txt &gt;&nbsp;/dev/null ]; then<br />
&nbsp; echo Mailing show slave status error report!!!<br />
&nbsp; /home/mysql-mail-problem.s<wbr />h<br />
fi<br />
<br />
<br />
./tmp.sh<br />
./tmp.sh: [: Slave_Running: Yes: binary operator expected<br />

</div>


grep exit status should be is 0 if selected lines are found and 1 otherwise.  in my case when the line "Slave_Running: Yes" not appent in the file I want to enter to the if.

> if [ ! grep ... ]; then
I add it and it fail on error

# if grep "Slave_Running: Yes" /home/status.txt > /dev/null; then
if [ ! grep "Slave_Running: Yes" /home/status.txt > /dev/null ]; then
  echo Mailing show slave status error report!!!
  /home/mysql-mail-problem.sh
fi


./tmp.sh
./tmp.sh: [: Slave_Running: Yes: binary operator expected


<div>
<div class="content wysiwyg-content">
How can I change this if:<br />
<br />
if grep &quot;Slave_Running: Yes&quot; /home/status.txt &gt;&nbsp;/dev/null; then<br />
&nbsp; &nbsp;echo Mailing show slave status error report!!!<br />
&nbsp; &nbsp;/home/mysql-mail-problem.s<wbr />h<br />
fi<br />
<br />
<br />
to &quot;if not&quot;<br />
<br />
Thanks<br />
Addady<br />

</div>
</div>


How can I change this if:

if grep "Slave_Running: Yes" /home/status.txt > /dev/null; then
   echo Mailing show slave status error report!!!
   /home/mysql-mail-problem.sh
fi


to "if not"

Thanks
Addady


bash shell  &quot;if not&quot;

Kernel programming for Linux operating systems can be done with many different languages; C, C++, Python, Perl and Java, which are some of the most common languages used.There are also many different varieties of Linux, such as Ubuntu, Fedora and OpenSUSE.

bash shell &quot;if not&quot;

bash shell "if not"