12-19-2019
When dealing with
/etc/passwd,
/etc/shadow, PAM or sudo files :
- Have a root session / prompt opened aside from everything else, you will use this session to fix / remedy if something does not work.
- Backup those files before editing cp /etc/passwd /etc/passwd_<date string>
- Use tools like vipw, vigr, visudo to avoid corruption.
Hope that helps
Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
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VIPW(8) System Management Commands VIPW(8)
NAME
vipw, vigr - edit the password, group, shadow-password or shadow-group file
SYNOPSIS
vipw [options]
vigr [options]
DESCRIPTION
The vipw and vigr commands edits the files /etc/passwd and /etc/group, respectively. With the -s flag, they will edit the shadow versions
of those files, /etc/shadow and /etc/gshadow, respectively. The programs will set the appropriate locks to prevent file corruption. When
looking for an editor, the programs will first try the environment variable $VISUAL, then the environment variable $EDITOR, and finally the
default editor, vi(1).
OPTIONS
The options which apply to the vipw and vigr commands are:
-g, --group
Edit group database.
-h, --help
Display help message and exit.
-p, --passwd
Edit passwd database.
-q, --quiet
Quiet mode.
-R, --root CHROOT_DIR
Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.
-s, --shadow
Edit shadow or gshadow database.
ENVIRONMENT
VISUAL
Editor to be used.
EDITOR
Editor to be used if VISUAL is not set.
FILES
/etc/group
Group account information.
/etc/gshadow
Secure group account information.
/etc/passwd
User account information.
/etc/shadow
Secure user account information.
SEE ALSO
vi(1), group(5), gshadow(5) , passwd(5), , shadow(5).
shadow-utils 4.1.5.1 05/25/2012 VIPW(8)