This command is generally used for processing the file data, in terms of length, character, bytes, line size etc. It is mostly used along with other commands to process the files and to understand their nature to take further actions accordingly.

It is awesome utility provided in Linux/UNIX environment to find any files residing under the OS. We can search for any files, with almost all the attributes a file has attached to it. It comes from “findutils-x.x.x” package, we have covered almost all the find options. This command is generaly found under the path “/bin/”.

It stands for “change shell” and is used to change the login shell for any user. The default shell is the command interpreter that is used when a user logs into the system. It comes from “util-linux-ng” package.

This command is used to change the file owner and or group of a file or directory. The ownership of a file or directory defines which user and group have control over file, like permission to read, write or execute. It comes from “coreutils” package.

The chmod command is used to modify permissions of files or directories. These permissions control the actions which can be performed on a file or directory, like reading, writing, and executing. It comes from “coreutils-x.x” package.

The chkconfig is used to update and query the runlevel information for system services. It comes from “chkconfig” package. Using chkconfig we can find any service’s startup configuration is it enabled or disbled during the system boot, which is helpful to set the services during the system boot.

The dir command is used to list/see the directory, and with its multipe switches we can get many details of a directory. It comes from “coreutils” package. If used efficiently this can be a very useful command or utility which can come handy for any linux administrator or linux enthusiast.