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Full Discussion: parsing /etc/passwd
Top Forums UNIX for Dummies Questions & Answers parsing /etc/passwd Post 302592175 by pandeesh on Monday 23rd of January 2012 05:34:50 AM
Old 01-23-2012
parsing /etc/passwd
i am parsing te /etc/passwd file and extracting the login and names alone.
But for some entries only login exist but no name. so i dont want to display those:
how i can check non emptiness for login and name in single if statement:
Code:
#!/usr/bin/bash
while IFS=: read login  a b c name e
do
 printf " %-12s %s\n" "$login" "$name"|cut -d, -f1
done</etc/passwd

The above works fine. but i want to make sure taht login and name are not empty:
i have tried the below:
Code:
if [ -n $login -a -n $name ]

BUt thats not working.
Please help me

Thanks
 

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LEARN ABOUT OSX

pwck

pwck(1M)						  System Administration Commands						  pwck(1M)

NAME

       pwck, grpck - password/group file checkers

SYNOPSIS

       /usr/sbin/pwck [filename]

       /usr/sbin/grpck [filename]

DESCRIPTION

       pwck  scans  the  password  file and notes any inconsistencies. The checks include validation of the number of fields, login name, user ID,
       group ID, and whether the login directory and the program-to-use-as-shell exist.  The default password file is /etc/passwd.

       grpck verifies all entries in the group file. This verification includes a check of the number of fields, group name, group ID, whether any
       login  names  belong  to  more  than  NGROUPS_MAX  groups,  and that all login names appear in the password file. The default group file is
       /etc/group.

       All messages regarding inconsistent entries  are  placed  on the stderr stream.

FILES

       /etc/group

       /etc/passwd

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getpwent(3C), group(4), passwd(4), attributes(5)

DIAGNOSTICS

       Group entries in /etc/group with no login names are flagged.

       Group file 'filename' is empty

	   The /etc/passwd or /etc/group file is an empty file.

       cannot open file filename: No such file or directory

	   The /etc/passwd or /etc/group file does not exist.

NOTES

       If no filename argument is given,  grpck checks the local group file,  /etc/group, and also makes sure that all login names encountered	in
       the  checked  group  file are known to the system  getpwent(3C) routine.  This means that the login names may be supplied by a network name
       service.

SunOS 5.10							    20 Oct 2002 							  pwck(1M)
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