Question

my system is Ubuntu 10

here is my code:

#!/bin/bash
pid = `ps -ef | grep process_string | /usr/bin/awk '{print $2}'`
`kill -9 $pid`

pid is the process id of process_string(there is only one matched)

but when I run this sh,I don’t kill the process

how can I solve it?

Answer 1

1. You can’t have space on either side of the assignment. In this case it’s trying to execute pid with arguments of = and the stdout of ps -ef ....
2. The second line will try to execute the output of kill -9 $pid, you don’t want that.
3. Better to use $(...) than backticks.

 #!/bin/bash
 pid=$(ps -ef | grep process_string | /usr/bin/awk '{print $2}')
 kill -9 $pid

You may want to use pgrep to get the pid instead, or pkill or killall to just kill by name directly (be careful with that last one, as the name implies it will kill all instances of the named program).