Replace a specific column with a specific value Post: 302915189

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Top Forums Shell Programming and Scripting Replace a specific column with a specific value Post 302915189 by RavinderSingh13 on Monday 1st of September 2014 09:41:34 AM

09-01-2014

Moderator

Litu,

This solution will work when you need to add variable at the last of the line. If any conditions are there for the variable to be added please let us know with full description, but if you need to add variable at last solution will work. Explaination of the solution is as follows.

Code:

echo "password sufficient pam_unix.so md5 shadow nullok try_first_pass use_authtok" | awk '$(NF+1)="remeber=10" 1'

$(NF+1) means I am adding one more field at last of the line as a line will have acually NF number of fields only, then I am giving 1 which means I am making condition part set to true so be default print operation will take place. Please refer man awk also for same, will be helpful for you.

EDIT: Please use the following solution for same as above solution will not give requested output, thanks Franklin for pointing it out.

Code:

awk '$(NF+1)="remeber=10"' filename

Thanks,
R. Singh

Last edited by RavinderSingh13; 09-01-2014 at 11:44 AM.. Reason: Adding correct solution to the thread

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LEARN ABOUT CENTOS

smartcard-auth

SYSTEM-AUTH(5)							 Linux-PAM Manual						    SYSTEM-AUTH(5)

NAME

       system-auth - Common configuration file for PAMified services

SYNOPSIS

       /etc/pam.d/system-auth /etc/pam.d/password-auth /etc/pam.d/fingerprint-auth /etc/pam.d/smartcard-auth

DESCRIPTION

       The  purpose  of  these configuration files are to provide a common interface for all applications and service daemons calling into the PAM
       library.

       The system-auth configuration file is included from nearly all individual service configuration files with the help of the substack  direc-
       tive.

       The password-auth fingerprint-auth smartcard-auth configuration files are for applications which handle authentication from different types
       of devices via simultaneously running individual conversations instead of one aggregate conversation.

NOTES

       Previously these common configuration files were included with the help of the include directive. This limited the  use	of  the  different
       action types of modules.  With the use of substack directive to include these common configuration files this limitation no longer applies.

BUGS

       None known.

SEE ALSO

       pam(8), config-util(5), postlogin(5)

       The three Linux-PAM Guides, for system administrators, module developers, and application developers.

Red Hat 							    2010 Dec 22 						    SYSTEM-AUTH(5)