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Old 11-20-2007
Registered User
 

Join Date: Nov 2007
Posts: 32
passing a list of dynamic names to a "PS" command in shell script?

Hi,

I am new to shell script. This is my first post .I have written a small script which returns list of names starts with "ram" in /etc/passwd .Here is that:-

#!/bin/ksh

NAME_LIST="name_list.txt"
cat /dev/null > $NAME_LIST

evalcmd="cat /etc/passwd | grep "^ram?*" | cut -d: -f1"
eval $evalcmd > $NAME_LIST 2>&1

echo $?

if [[ $? -ne 0 ]] then
echo "Failed to create list of names";
else
echo "List of names are created successfully";
fi

The thing is that i need to pass these dynamic names from /etc/passwd to a "ps" command like:-

ps -o user,fname -U ram,ramdev1,ramdev2,ramdev3

Since i cannot hardcode the names like ram,ramdev1,ramdev2,etc i need to pass these names in a single
command. something like:-


cat /etc/passwd | grep "^ram?*" | cut -d: -f1| ps --o user,fname -U <dynamic variable which fetches the whole name in /etc/passwd>

Since i am pretty much new to shellscript.Please do help me on this. This is really urgent to be delivered. Hence pls. do the needful.

Thanx,
Sachin
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Old 11-20-2007
Registered User
 

Join Date: Nov 2007
Posts: 32
No replies... Pls. do help me in this. It is really urgent.
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Old 11-20-2007
LivinFree's Avatar
Goober Extraordinaire
 

Join Date: Jul 2001
Location: Portland, OR, USA
Posts: 1,584
What shell / OS?

If you're using bash, you should be able to get away with something like:
Code:
#! /bin/bash

typeset -i n=0
typeset -a names

oldifs="$IFS"
IFS=:
 while read passwdname _; do
  [[ $passwdname == *a* ]] && names[n++]=$passwdname
 done </etc/passwd
IFS="$oldifs"

names=${names[*]}
ps --o user,fname -U ${names// /,}
Or:
Code:
ps --o user,fname | gawk '/^[^ ]*ram/{print $1}'
I'm sure there's a dozen ways of doing this better, but those are the first two things I thought of.
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Old 11-21-2007
Klashxx's Avatar
HP-UX/Linux/Oracle
 

Join Date: Feb 2006
Location: Almerķa, Spain
Posts: 371
U can try (in ksh):
Code:
awk -F\: '/^ram?*/ {print $1}' /etc/passwd|xargs -i ksh -c 'ps --o user,fname |grep {}'
Regards

Last edited by Klashxx; 11-21-2007 at 12:27 AM.
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