Bash Redirecting STDIN

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Example

< reads from its right argument and writes to its left argument.

To write a file into STDIN we should read /tmp/a_file and write into STDIN i.e 0</tmp/a_file

Note: Internal file descriptor defaults to 0 (STDIN) for <

$ echo "b" > /tmp/list.txt
$ echo "a" >> /tmp/list.txt
$ echo "c" >> /tmp/list.txt
$ sort < /tmp/list.txt
a
b
c
Redirection to network addresses