On previous post we have looked install libssl-dev package in ubuntu machine, this page shows you To remove libssl-dev package itself from Ubuntu 14.04 execute on terminal,

A core file or core dump is a file that records the memory image of a running process and its process status, to find out getting a segmentation fault.

If you may have receives an error like the command could not be located because sbin is not included in the PATH environment variable.

Assume that, some files are stored in my user path with .txt suffix. If you want to rename them all to follow this pattern.

If you have a script or a command to execute in another user, assume that the Hadoop command to execute in Hadoop user from the root, use the below commands,

wget command is very helpful to download the files by remotely, many functionalities available in wget command. On this post describe to download the entire website from the server.

DD command is very help to Copy a file, converting and formatting according to the operands. Also helpful for take backup files with different formats.