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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)							      General Commands Manual							    asa(1)

NAME
asa - interpret ASA carriage control characters SYNOPSIS
[files] DESCRIPTION
interprets the output of FORTRAN programs that utilize ASA carriage control characters. It processes either the files whose names are given as arguments, or the standard input if is specified or if no file names are given. The first character of each line is assumed to be a control character. The following control characters are interpreted as indicated: (blank) Output a single new-line character before printing. (space) (UNIX Standard only, see standards(5)) The rest of the line will be output without change. A <newline> shall be output, then the rest of the input line. Output a new-page character before printing. Overprint previous line. (UNIX Standard only, see standards(5)) The <newline> of the previous line shall be replaced with one or more implementation-defined characters that causes printing to return to column position 1, followed by the rest of the input line. If the + is the first character in the input, it shall have the same effect as <space>. Lines beginning with other than the above characters are treated the same as lines beginning with a blank. The first character of a line is printed. If any such lines appear, an appropriate diagnostic is sent to standard error. This program forces the first line of each input file to start on a new page. (UNIX Standard only, see standards(5)) The action of the asa utility is unspecified upon encountering any character other than those listed above as the first character in a line. To view the output of FORTRAN programs which use ASA carriage control characters and have them appear in normal form, can be used as a fil- ter: The output, properly formatted and paginated, is then directed to the line printer. FORTRAN output previously sent to a file can be viewed on a user terminal screen by using: EXTERNAL INFLUENCES
For information about the UNIX standard environment, see standards(5). Environment Variables determines the interpretation of text within file as single- and/or multi-byte characters. determines the language in which messages are displayed. If or is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty variable. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multi-byte character code sets are supported. SEE ALSO
efl(1), f77(1), ratfor(1), standards(5). STANDARDS CONFORMANCE
asa(1)
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