The Linux Expert!!
The ‘useradd’ command is used to create a new user or update default new user information under your system/server. Syntax: # useradd [options] NAME Switches of ‘useradd’ command: 1, -b, –base-dir BASE_DIR The default base directory for the system if…
The “groupmod” command modify a group definition on the system. Syntax: # groupmod [options] GROUPNAME Switches with example: 1, -g, –gid GID The group ID of the given GROUP will be changed to GID. The value of GID must be…
The command ‘groupmems’ is used to administrate Linux groups. Syntax: # groupmems -a user_name | -d user_name | [-g group_name] | -l | -p Switches with example: 1, -a, –add user_name Add an user to the group membership list. If…
The “gropadd” is used to create a new group under Linux. Syntax: # groupadd [options] GROUPNAME Switches with example: 1, -f, –force This option causes the command to simply exit with success status if the specified group already exists. When…
We already discussed the details of CRONJOBS. Crontab is the program used to install, remove or list the tables used to drive the cron daemon. We can create individual cronjobs for users under server. Click here for mode details about…
RDNS is the abbreviation of Reverse Domain Name System. Working principle of RDNS is just opposite to that of normal DNS, Domain Name System. The RDNS is a pointer(PTR) record entry which helps to find out the host-name associated with…
The exim is an open source email server and it has a lot of flexible options and commands to manage. Here is some useful configuration and log files of the exim mail server for WHM/cPanel and Directadmin server. Understanding the…