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Top Forums UNIX for Beginners Questions & Answers How to replace line through sed , but without uncommented? Post 303041818 by yash_message on Wednesday 4th of December 2019 01:26:15 PM
Old 12-04-2019
How to replace line through sed , but without uncommented?

I am looking to replace minimum password value in login.defs file. it does change , but it change the commented one also.
please

1. my script to be change 12 in the below line...
Code:
sed -i '/PASS_MIN_LEN/c\PASS_MIN_LEN 12' /etc/login.defs

action- It does change, but it change in 2 place.
Code:
PASS_MIN_LEN 12  Previous was - #       PASS_MIN_LEN    Minimum acceptable password length.
PASS_MIN_LEN 12

It was replaced #(commented line) also.

Please help the correct sed syntex, which could change the excat value only

Last edited by vbe; 12-04-2019 at 02:29 PM.. Reason: code tags please
 

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yppasswd(1)						      General Commands Manual						       yppasswd(1)

NAME
yppasswd - change password in Network Information Service (NIS) SYNOPSIS
yppasswd [name] DESCRIPTION
Note If Enhanced Security is enabled on your system, use the passwd command to change your password, even if NIS is in use. The yppasswd command lets you change your password in the Network Information Service (NIS) map, a network data base service. Only you or the superuser can change your NIS password. When you enter the yppasswd command, the program prompts you for the old password and then for the new password. Note that the passwords are not displayed on the screen. Next, the program asks you for the new password again, to verify that you have typed it correctly. If you do not type the passwords cor- rectly, you will receive an error message after you enter the new password. Your new NIS password must meet one of the following requirements: It must be a combination of at least six alphanumeric characters, or It must be a minimum of four characters, with at least one being non-alphanumeric, such as a control sequence. Note The passwd command does not change the NIS password. This command only changes the local password file (/etc/passwd), and not the NIS mas- ter password file. ERRORS
Your new password does not meet the minimum length requirement. You misspelled your new password or its verification. Your new password can not be activated. It must be different from your old password and your login name. FILES
Password file NIS directory SEE ALSO
passwd(1), passwd(4), ypfiles(4), yppasswdd(8) Network Administration yppasswd(1)
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