Its k Eric.
which command show empty for both.

root@server [~]# which crond
root@server [~]# which echo
root@server [~]#

Hi,

The PATH variable contains the various directories where your system will look for commands if you only type a command without the full path. So if for example you type:
it will give you your IP configuration(s) if /sbin is mentioned in your PATH. If it is not you'll get an error but it will work if you put in the full path:
Another example, a regular user doesn't have the same PATH as root. If you try running a command with sudo and you don't have the path included in your PATH, then it'll tell you 'command not found'. If, on the other hand, you type the full path the command will execute, of course if sudo is configured to allow you. I hope that makes it a bit clearer.

Kind regards,

Eric

Ya am k with your explanation.......

Hi Eric,

How can i develop my security side in linux.

Hi Eric,
Do u have knowledges in Icinga?

Hi,

A very good starting point can be found right here at LQ Security. It's a very good source of security related references.

Kind regards,

Eric

Hi,

No, none whatsoever. Don't even know what Icinga is. Had to look it up.

Kind regards,

Eric