Print out which hosts are not running specific process

for i in `cat hosts_list`; do RES=`ssh myusername@${i} "ps -ef " |awk '/[p]rocessname/ {print $2}'`; test "x${RES}" = "x" && echo $i; done
Given a hosts list, ssh one by one and echo its name only if 'processname' is not running.
Sample Output

By: arlequin
2014-10-03 14:57:54

What Others Think

I'd make a few changes... First $(command) is better than `command` because they can be nested. Nice use of awk, but pgrep lives in the same package as ps and it's simpler. Then I've moved the test onto the remote server so that I can just use || (or). for i in $(cat hosts_list); do ssh myusername@$i "pgrep iodined > /dev/null || echo $i"; done
flatcap · 367 weeks and 4 days ago
@flatcap: Great improvement, thank you! Simplicity is the key! Although, pgrep isn't a standard Unix tool and I use to check AIX systems: for i in $(cat hosts_list); do ssh myusername@${i} "ps -ef |grep [p]rocessname > /dev/null || echo $i"; done
arlequin · 366 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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