Awk command to kill multiple process

Sometime killall -9 will not work. Then you can try using awk command.

ps -ef | grep httpd | grep -v grep | awk ‘{print “kill -9″, $2}’ | sh

Here I am taking the case of httpd. Replace that with the process that you want to kill

awk command with more examples

The special variable FS (Field Separator) determines how awk will split up each record into fields. This variable can be set on the command line.

For example, /etc/passwd has its fields separated by colons.

#awk -F: ‘{print $1,$3 }’ /etc/passwd

Print the second field, then the first. All other fields are ignored.

#awk ‘{print $2,$1}’ filename

How to find out all failed login attempts via ssh/telnet?

Use grep command to find out authentication failure message from /var/log/messages file

Use awk and cut command to print IPs/hostname

Use sort command to sort them

Use uniq command to print total failed login attempts

Login as root then run the following command

# grep “authentication failure” /var/log/messages|awk ‘{ print $13 }’ | cut -b7- | sort | uniq -c

or

grep “authentication failure” /var/log/messages | sed -n -e “s/.*rhost=\([^ ]*\).*/\1/p” | sort | uniq -c

Tags: awk command, awk command examples, kill process from command line, linux kill process

Category: Linux Administration