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Full Discussion: extracting a line based on line number
Top Forums Shell Programming and Scripting extracting a line based on line number Post 302136848 by narendra.pant on Thursday 20th of September 2007 03:22:04 AM
Old 09-20-2007
extracting a line based on line number
i want to cut all the entries from the /etc/passwd file in which the uid is> 500

for this i was writing this ,m quiet new to all this.. scripting

but on the 6th n 8th line ,, i hav to specify a line number .. to get the commnd working .. but i want to use variable i instead of that ,, which is not allowed ..

my problem is that ,, i have a variable i , which is being incremented n it is containing an integer value as u can c , now i want to print that line which is satisfying the if condition .


because i was not working so i wrote 56 instead of that , as in my passwd file it was havin pid >500 just to test ..







#!/bin/bash
nol=`wc -l /etc/passwd | cut -d " " -f 1`
i=1
if [ $nol -ge $i ]
then
if [ `sed -n '56p' /etc/passwd | cut -d \: -f 3` -ge 500 ]
then
sed -n '56p' /etc/passwd >hii
i=`expr $i + 1`
fi
fi
exit
 

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LEARN ABOUT HPUX

getpw

getpw(3C)																 getpw(3C)

NAME

       getpw() - get name from UID

SYNOPSIS

DESCRIPTION

       searches the password file for a user ID number that equals uid, copies the line of the password file in which uid was found into the array
       pointed to by buf, and returns 0.  returns non-zero if uid cannot be found.  The line is null-terminated.

       This routine is included only for compatibility with prior systems, and should not be used; see getpwent(3C) for routines to use instead.

NETWORKING FEATURES

   NFS
       This routine is implemented using (see getpwent(3C)) and therefore uses the Network Information Service network database  as  described	in
       passwd(4).

RETURN VALUE

       returns non-zero on error.

WARNINGS

       The above routine uses which causes it to increase, more than might be expected, the size of programs not otherwise using standard I/O.

   Obsolescent Interfaces
       is to be obsoleted at a future date.

AUTHOR

       was developed by AT&T and HP.

FILES

       /etc/passwd

SEE ALSO

       getpwent(3C), passwd(4), thread_safety(5).

STANDARDS CONFORMANCE

								  TO BE OBSOLETED							 getpw(3C)
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