How do use awk along with a command to show the process ID with the 'ps' command

Question

I'm able to to show the PID (2nd) column with the below command, but instead I want to show pwdx <PID> and also the COMMAND(8th) column. Thanks in advance, Chirag

ps -ef | grep runner | awk {'print$2'}
2432
6346
6348
6350
6352
7407
7410
7416
10824
17305
17494
29658

Answer 1

Instead of using awk to filter ps output, use the ps -o option to get what you want:

ps -e -o pid,comm

That should do what you describe above. See the ps man page for more things to print out.

UPDATE: I see I've failed to use pwdx. Try this on for size:

#!/bin/bash
ps -o pid= -o comm= |
while read LINE
do
    eval $(echo $LINE |
    awk '{pid=$1; comm=$2; printf "echo -n \"%s  \"; pwdx %s\n", comm, pid}' )
done

You may need to add flags to ps to get processes you want - the above only shows you your user ID's processes.

Answer 2

If you would like to print col 2 and 8 you just add $8 to the print.

ps -ef | grep runner | awk {'print $2" "$8'}

Answer 3

The following both work for me:

ps -ef | grep runner | awk {'print$2'} | xargs pwdx

and

ps -ef | grep runner | for i in `awk {'print$2'}`; do pwdx $i; done

FYI, you will get one that looks like: 3516: No such process which will correspond to your grep runner that will have completed by the time pwdx is called. (Also, for anyone using OS X, pwdx isn't in the default installation.)

EDIT: I just realized that you wanted to return COMMAND, too. This will show all three on one line for each process matching runner:

ps -ef | grep runner | for i in `awk {'print$2'}`; do echo `ps -e -o pid,comm | grep $i` `pwdx $i | awk {'print$2'}`; done

Answer 4

Here's how I would do it:

pwdx $(ps -ef | grep runner | awk {'print$2'})

alternate syntax:

pwdx `ps -ef | grep runner | awk {'print$2'}`

Answer 5

pwdx $(pgrep -f runner)|tr -d : > /tmp/1
pgrep -fl runner > /tmp/2
join /tmp/[12]

Answer 6

ps -e -o pid,comm | 
while read pid cmd; do 
  printf "%s %s %s\n" $pid $cmd "$(pwdx $pid| cut -d " " -f 2-)"
done

You might get some directories "No such process" if the process ends before pwdx is invoked for it.