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Full Discussion: $(< file ) and $( cat file )
Top Forums Shell Programming and Scripting $(< file ) and $( cat file ) Post 303012384 by ctsgnb on Saturday 3rd of February 2018 04:27:16 AM
Old 02-03-2018
Yeah, I agree with you regarding the UUOC one.
The test with -- was just bulk try just to see if it would get the -- as an end of options and see how it would handle the rest of the command line.

I ran it on an AIX machine which didn't return an error message, but a fooled output instead, with some strange control character (the kind of output that sometimes may mess up your PuTTY screen ...)

As Yoda and Scruti noticed, I think the confusing point was that, $(< /dev/urandom tr -dc '[:alnum:],@#:!?+-' | head -c10 )
is not interpreted as the special case $(<filename) but as the $( cmd )

This brings me to the question :
Does the special case $(<filename) support only and strictly 1 file ?

Last edited by ctsgnb; 02-03-2018 at 05:37 AM..
 

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ASA(1)							    BSD General Commands Manual 						    ASA(1)

NAME
asa -- interpret carriage-control characters SYNOPSIS
asa [file ...] DESCRIPTION
The asa utility reads files sequentially, mapping FORTRAN carriage-control characters to line-printer control sequences, and writes them to the standard output. The first character of each line is interpreted as a carriage-control character. The following characters are interpreted as follows: <space> Output the rest of the line without change. 0 Output a <newline> character before printing the rest of the line. 1 Output a <formfeed> character before printing the rest of the line. + The trailing <newline> of the previous line is replaced by a <carriage-return> before printing the rest of the line. Lines beginning with characters other than the above are treated as if they begin with <space>. EXIT STATUS
The asa utility exits 0 on success, and >0 if an error occurs. EXAMPLES
To view a file containing the output of a FORTRAN program: asa file To format the output of a FORTRAN program and redirect it to a line-printer: a.out | asa | lpr SEE ALSO
f77(1) STANDARDS
The asa utility conforms to IEEE Std 1003.1-2001 (``POSIX.1''). AUTHORS
J.T. Conklin, Winning Strategies, Inc. BSD
May 9, 2002 BSD
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