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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vipw(8) System Manager's Manual vipw(8)
NAME
vipw - Edits the /etc/passwd file
SYNOPSIS
/usr/sbin/vipw
DESCRIPTION
You use the vipw command to edit the /etc/passwd file with the editor defined in the EDITOR environment variable. If the variable is not
set, the default editor is vi.
The vipw command performs basic consistency checks on the edited file. If a hashed indexed passwd existed previously, the vipw command
uses the mkpasswd command to create recreate it.
The command must not be used on systems that use extended security attributes since it cannot set or change them. You must be root to run
this command. Only root and security administrators should have execute access to this command.
Since the vipw command cannot effectively change all the attributes of users, it should not be used in a secure environment.
The vipw command accesses the following files, and requires the listed permissions:
------------------------------
Permissions File
------------------------------
rw /etc/passwd
rw /etc/passwd.pag
rw /etc/passwd.dir
rw /etc/ptmp
rw /etc/ptmp.pag
rw /etc/ptmp.dir
------------------------------
EXAMPLE
To edit the /etc/passwd file, type the following command and add the required line entry: vipw
FILES
Specifies the command path
RELATED INFORMATION
Commands: passwd(1), passwd(4), adduser(8), mkpasswd(8) delim off
vipw(8)