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Full Discussion: Need to replace last field in a file,if first field matches
Top Forums Shell Programming and Scripting Need to replace last field in a file,if first field matches Post 302976706 by RudiC on Monday 4th of July 2016 06:12:09 AM
Old 07-04-2016
Howsoever, "But its not working" is not an utmost good starting point for an analysis. You should describe exactly what in the current behaviour doesn't fulfill your needs or what the error message(s) be.

I guess the target string is appended to the entry, not replacing the last field's value? So you should provide that value, so the substitute has something to replace:
Code:
sed '/^deekshi/s|[^:]*$|/bin/nologin|' file
deekshi:x:7082:7082::/home/deekshi:/bin/nologin
harini1:x:7083:7083::/home/harini1:/bin/bash

On top, it is good practice to anchor the search pattern (if possible), here to the start-of-line, to be safe of false positives.
 

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LEARN ABOUT MOJAVE

nologin

NOLOGIN(5)						      BSD File Formats Manual							NOLOGIN(5)

NAME

     nologin -- disallow logins

DESCRIPTION

     Programs such as login(1) disallow logins if the nologin file exists.  The programs display the contents of nologin to the user if possible
     and interrupt the login sequence.	This makes it simple to temporarily prevent incoming logins systemwide.

     To disable logins on a per-account basis, investigate nologin(8).

SECURITY

     The nologin file is ignored for user root by default.

IMPLEMENTATION NOTES

     The nologin feature is implemented through login.conf(5), which allows to change the pathname of the file and to extend the list of users
     exempt from temporary login restriction.

     PAM-aware programs can be selectively configured to respect nologin using the pam_nologin(8) module via pam.conf(5).

     The nologin file will be removed at system boot if it resides in /var/run and cleanvar_enable is set to ``YES'' in rc.conf(5), which is
     default.  Therefore system reboot can effectively re-enable logins.

FILES

     /var/run/nologin  default location of nologin

SEE ALSO

     login(1), login.conf(5), pam.conf(5), rc.conf(5), nologin(8), pam_nologin(8), shutdown(8)

BSD
								   May 10, 2007 							       BSD
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