The command line arg V.S The standard input of a command

bash-command-line

In most case, if a command takes a file name as a command line arg, we can also use the content of
the file as the standard input of a command, the two ways have the same effect.

For example, a directory contains the following files:

        example1.txt
        example2.txt
        example3.txt
        example4.txt
        example5.txt
        example6.txt
        example7.txt
        example8.txt
        example9.txt
        example10.txt
What we wanna do is to remove the suffix of all file, we can use command `cut -f1 -d'.' <<<$(ls *.*)` ;
The other is to store the filename list in a temprary file, eg tempfile, then we use `cut -f1 -d'.' tempfile`.
The former way is provide a string containing the file list as the cut's standard input, and the latter 
one is to provide a file which contains the file list as it's command line arg.