display all the ssh pids where the users are connected to in one line

Question

How can I display all the ssh pids where the users are connected to in one line separated by comma ?

This command displays the output in multiple lines, I would like to have the output in one line.

ps aux | grep -i "ssh" | awk '{print $2}'

from

To

1325, 3255, 2323, 5321, 3252

Thank You!

score 1 · Accepted Answer · answered Jul 29 '15 at 13:15

You may want to use pgrep to get the processes IDs directly:

$ pgrep ssh
1217
5305

This way, you avoid calling ps aux and parsing its output, which will always contain the grep itself.

To join them on a ,-separated list, use paste on a -serial mode:

$ pgrep ssh | paste -s -d,
1217,5305

Fernando Martín Besteiro · Answer 2 · 2015-07-29T13:23:41.527

0

You could use sed utility in another pipe, so the command would be:

ps aux | grep -i "ssh" | awk '{print $2}' | sed ':a;{N;s/\n/, /};ba'

Where you are in fact replacing new lines (except the final one) by commas.

edited Jul 29 '15 at 13:23

answered Jul 29 '15 at 13:16

Something went wrong. Since I am quite newbie with sed and awk, the command seems to be incomplete. Could you please take a look and tell me what went wrong ? – VGM Jul 29 '15 at 13:22
Thank you ! Works like charm! silly me,I should have seen that '. Next time, I will :) – VGM Jul 29 '15 at 13:27
1

Note that doing `something | grep | awk | sed` is quite inefficient. It can be probably handled alone by `awk`. – fedorqui Jul 29 '15 at 13:28
As written on the previous answer, pgrep and paste are way more efficient. I just followed OP's code. – Fernando Martín Besteiro Jul 29 '15 at 13:30
Thank you, all! I really appreciate your help – VGM Jul 29 '15 at 13:33

2 Answers2