Question

bash shell "if not"

Asked by: addady

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

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Asked On
2002-11-17 at 04:10:30ID20400481
Tags

bash

Topic

Linux Programming

Participating Experts
1
Points
50
Comments
3

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Answers

 

by: ahoffmannPosted on 2002-11-17 at 11:18:49ID: 7460292

if [ ! grep ... ]; then

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

 

by: addadyPosted on 2002-11-17 at 20:23:09ID: 7462289

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

 

by: ahoffmannPosted on 2002-11-18 at 08:40:06ID: 7464569

oops, was too lazy ..

grep "Slave_Running: Yes" /home/status.txt > /dev/null
if [ $? -ne 0 ]; then
     echo Mailing show slave status error report!!!
fi

20120131-EE-VQP-002

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