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Full Discussion: AIX sed/awk
Top Forums Shell Programming and Scripting AIX sed/awk Post 302759687 by Don Cragun on Tuesday 22nd of January 2013 06:44:57 PM
Old 01-22-2013
Quote:
Originally Posted by pjeedu2247
Code:
cat /etc/pam.conf | \
awk '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' OFS='\t' > /etc/pam.conf


The above worked. I really appreciate your help. Would you mind explaining me the whole command above?

Thanks a lot.
The command bipinajith supplied:
Code:
awk -FS='\t' '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' OFS='\t' /etc/pam.conf

reads lines from /etc/pam.conf and for any line where the first field is exactly the string ssh or the string emagent it replaces the string prohibit in the last field in the line with the stringaix. It then writes the updated file to standard output (usually the terminal where you run the command) unless you redirect the output to a different file.

The pipeline that you say is working should turn the file /etc/pam.conf into an empty file. The pipeline uses that file both as an input file and as an output file. When you do this, the shell will throw away the current contents of the file before starting cat to feed the (now empty) contents of the file into awk.
 

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LEARN ABOUT LINUX

pam_localuser

PAM_LOCALUSER(8)						 Linux-PAM Manual						  PAM_LOCALUSER(8)

NAME

       pam_localuser - require users to be listed in /etc/passwd

SYNOPSIS

       pam_localuser.so [debug] [file=/path/passwd]

DESCRIPTION

       pam_localuser is a PAM module to help implementing site-wide login policies, where they typically include a subset of the network's users
       and a few accounts that are local to a particular workstation. Using pam_localuser and pam_wheel or pam_listfile is an effective way to
       restrict access to either local users and/or a subset of the network's users.

       This could also be implemented using pam_listfile.so and a very short awk script invoked by cron, but it's common enough to have been
       separated out.

OPTIONS

       debug
	   Print debug information.

       file=/path/passwd
	   Use a file other than /etc/passwd.

MODULE TYPES PROVIDED

       All module types (account, auth, password and session) are provided.

RETURN VALUES

       PAM_SUCCESS
	   The new localuser was set successfully.

       PAM_SERVICE_ERR
	   No username was given.

       PAM_USER_UNKNOWN
	   User not known.

EXAMPLES

       Add the following line to /etc/pam.d/su to allow only local users in group wheel to use su.

	   account sufficient pam_localuser.so
	   account required pam_wheel.so

FILES

       /etc/passwd
	   Local user account information.

SEE ALSO

       pam.conf(5), pam.d(5), pam(7)

AUTHOR

       pam_localuser was written by Nalin Dahyabhai <nalin@redhat.com>.

Linux-PAM Manual						    06/04/2011							  PAM_LOCALUSER(8)
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