Regularly, I have seen the following syntax:awk 'stuff' <filesort <fileThe thing is, I usually write:awk 'stuff' filesort fileAnd things work perfectly. So if both syntaxes are roughly equivalent (or are they?), is there any benefit from using <file syntax ?EDITExisting threads cover some of my interrogations (using < implies that the shell opens the file first and then passes it as standard input to the command), but I feel that some remain:POSIX compliancy ?Is it to dissipate any ambiguity concerning the nature of file argument ?Is it specific to a certain type of shell ?Is it considered deprecated ?Performance-wise, is there a notable difference ?Any example where you would use one against the other is welcome.
Using 
shell;input method