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How to Use Special Keys in UNIX

UNIX operating system has some special keys. These you can use to interrupt the program processing or to resume it. The file management and keys totally different in UNIX kinds of operating systems. 



An example of a UNIX special key and its use.
Special Keys in UNIX much useful to take action  when something happens.

1. Why You Need Program Interruption in UNIX.

A scenario where you made some mistake in the input command and you need to stop the further process. Then you can use the CTRL+C command. It is equal to the DELETE command.

2. List of UNIX Special Keys.

RETURN key 
The RETURN key signifies the end of a line of input. On any terminal, RETURN has a key of its own, or return may be typed by holding down the control key and typing a 'm'.

CTRL-m Key
Hint: Ctrl-m command is equal to RETURN key in Unix systems


DELETE Key
The DELETE key stops a program/command immediately, without waiting for it to finish. DELETE can be achieved equivalently with ctrl-c.
Hint: Ctrl-c Command you can use …

The best helpful hdfs file system commands (1 of 4)

The best helpful hdfs file system commands
#The best helpful hdfs file system commands:

cat
hadoop fs -cat FILE [ ... ]
Displays the file content. For reading compressed files, you should use the TEXT command instead.

chgrp
hadoop fs -chgrp [-R] GROUP PATH [ PATH....]

Changes the group association for files and directories. The -R option applies the change recursively.

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