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 REDHAT
getpwnam
GETPWNAM(3) Linux Programmer's Manual GETPWNAM(3)
NAME
getpwnam, getpwuid - get password file entry
SYNOPSIS
#include <pwd.h>
#include <sys/types.h>
struct passwd *getpwnam(const char *name);
struct passwd *getpwuid(uid_t uid);
DESCRIPTION
The getpwnam() function returns a pointer to a structure containing the broken out fields of a line from /etc/passwd for the entry that
matches the user name name.
The getpwuid() function returns a pointer to a structure containing the broken out fields of a line from /etc/passwd for the entry that
matches the user uid uid.
The passwd structure is defined in <pwd.h> as follows:
struct passwd {
char *pw_name; /* user name */
char *pw_passwd; /* user password */
uid_t pw_uid; /* user id */
gid_t pw_gid; /* group id */
char *pw_gecos; /* real name */
char *pw_dir; /* home directory */
char *pw_shell; /* shell program */
};
RETURN VALUE
The getpwnam() and getpwuid() functions return a pointer to the passwd structure, or NULL if the matching entry is not found or an error
occurs.
ERRORS
ENOMEM Insufficient memory to allocate passwd structure.
FILES
/etc/passwd
password database file
CONFORMING TO
SVID 3, POSIX, BSD 4.3
SEE ALSO
fgetpwent(3), getgrnam(3), getpwent(3), setpwent(3), endpwent(3), getpw(3), putpwent(3), passwd(5)
GNU
1996-05-27 GETPWNAM(3)