CODEWITHSUNDEEP
linuxbashfunctionawk
theuniverseisflat
theuniverseisflat

Reputation: 881

invoking function and command using awk

Hi this script works fine, it calls the function when there a cronjob running under root

usage ()
{
# Print usage
       echo "usage function"
}
#

export -f usage
ps -ef | awk '{if ($0 ~ /crond/ && $1 == "root") {system("/usr/bin/env bash -c usage") }}'

However, in addition to calling the function I also like to print $2 or just call a second command. I cannot get the syntax right. Can someone help please. in short, how do you run multiple commands when the condition is met? In the example above, in addition to running the usage() function I also like to run a second function and also print $2 ( which is the process ID ). Thanking you all in advance

Upvotes: 0

Views: 52

Answers (2)

user559633
user559633

Reputation:

For Bash, you can use ; or && to chain together commands.

; is used to separate commands, but does not check the error code of the previous command. e.g. dddate; echo 'hi' will echo 'hi', even though "dddate" likely returns an error.

&& will only run the latter command if the previous command doesn't throw an error. e.g. dddate && echo 'hi'will not run the echo command because dddate failed.

For your usage, you could make:

system("/usr/bin/env bash -c usage") into system("/usr/bin/env bash -c usage); print $2".

root@debian:~# ps -ef | awk '{if ($0 ~ /crond/ && $1 == "root") {system("/usr/bin/env bash -c usage"); print "hi"}}'
usage function
hi

Upvotes: 2

RBH
RBH

Reputation: 592

Try running multiple commands separated by semicolon

For example :

ps -ef | awk '{if ($0 ~ /crond/ && $1 == "root") {system("/usr/bin/env bash -c usage"); system("/usr/bin/env bash -c func2"); print $2 }}'

Upvotes: 1

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