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Problem printing with awk

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# 1  
Old 11-26-2017
Problem printing with awk
Hi, so i have this command:

Code:
ps axo cmd=,user=,%cpu=,priority= --sort=-%cpu | awk '{print $2}'

And i want to print the second column, that is user. The thing is that i dont know why this is my output:

Code:
root
Eskizoi+
Eskizoi+
axo
{print

I dont know why axo and {print are there, the three first users are correct but i dont know what im doing wrong. If i change $2 to $1 the result is correct, so i dont know whats failing.

Thank you very much
# 2  
Old 11-26-2017
Some of the ps output writes more columns than the others.

You could try taking the output from the end:

e.g.
Code:
ps ... | awk '{print $(NF-2)}'

Or, for a unique list:
Code:
ps ... | awk '!A[$(NF-2)]++ {print $(NF-2)}'

Or change your ps command to put the user first, then print $1.

Question: If all you want is the username, why add the other columns to ps in the first place? What do you want this information to do with?
# 3  
Old 11-26-2017
My output from what you gave me:

Code:
CMD                         USER
/init                           root
/bin/bash                   Eskizoide
/bin/bash                   Eskizoide
axo
{print

print and axo are still there, and that prints the 2 columns, i only want the second. Thx for the reply.

EDIT: mmm, its gotta be something with how i wrote the command because this works with any column.

Code:
ps axo pid,%cpu | awk '{print $2}'

# 4  
Old 11-26-2017
If you want the user and the command only:
Code:
ps axo user=,cmd= --sort=-%cpu

"print" and "axo" are there because they're part of the command (cmd=) column output by ps. cmd is multi-word, so you can't assume that $2 will contain the username. If you change the order (user=,cmd=) then you can assume that "$1" will contain the username (assuming the username does not contain spaces).

Code:
ps axo user=,cmd= --sort=-%cpu | while read user cmd; do
    echo "User: $user, Command: $cmd"
done

# 5  
Old 11-26-2017
Another approach is to generate a delimited output.
Code:
ps -eo "%c,%U,%C,%n"

Format descriptors used:-
Code:
       CODE   NORMAL   HEADER
       %C     pcpu     %CPU
       %U     user     USER
       %c     comm     COMMAND
       %n     nice     NI

Then use awk to print unique values:-
Code:
ps -eo "%c,%U,%C,%n" | awk -F, '{A[$2]}END{for(k in A) print k}'

# 6  
Old 11-27-2017
Thx for the replies, i was doing something very dumb, i didnt know i could show ionly one column from ps and sort it from cpu usage. like:

Code:
ps axo user= --sort=-%cpu

Im very new to this so i didnt know it. What a i want to do is to create a table with printf with different attributes from a process, then call my script without arguments to print by default all those processes with their attributes, but i also want to call my script with arguments to show me only processes from certain user or only processes with priority between "x" and "z".

I think now i know how to do it so thank you very much.

Ah, one last question, i having this problem with printf where it prints all in one column not with the format a said to it.

This is the command:

Code:
printf "%10s %25s %10s %30s %10s %10s %20s %50s\n" "$(ps axo cmd= --sort=-%cpu)" "$(ps axo user= --sort=-%cpu)"

This the output:

Code:
/init
/bin/bash
ps axo cmd= --sort=-%cpu  root
Eskizoide
Eskizoide

I dont know if im missing something but i think the syntax is correct.
# 7  
Old 11-27-2017
printf's format string doesn't seem to match the data supplied. You may have to rearrange the pss' output first, and then printf it.
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