How to detect whether input is from keyboard, a file, or another process.
Useful for writing a script that can read from standard input, or prompt the user for input if there is none.
Source: LinuxQuestions.org
Last active
August 29, 2015 14:08
-
-
Save antenore/b27dbf0696641b04036f to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| if readlink /proc/$$/fd/0 | grep -q "^pipe:"; then | |
| # Pipe input (echo abc | myscript) | |
| elif file $( readlink /proc/$$/fd/0 ) | grep -q "character special"; then | |
| # Standard input (keyboard) | |
| else | |
| # File input (myscript < file.txt) | |
| fi |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment