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Full Discussion: Regarding redirection using cat.
Top Forums UNIX for Dummies Questions & Answers Regarding redirection using cat. Post 302227364 by spirtle on Thursday 21st of August 2008 04:59:33 AM
Old 08-21-2008
Quote:
1) cat < K1 K2
The above operation should actually display contents of the both files.
I'm curious, what makes you think it should do that? My man page states
Quote:
Concatenate FILE(s), or standard input, to standard output.
(my emphasis), which I understand to mean "not both", i.e. if you give cat a file to read from, standard input is ignored.

Code:
cat > K1 K2

Like Latin, the word order is not as important as the syntax. >K1 means that the output goes into K1. You can achieve the same affect with
Code:
>K1 cat K2

 

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LEARN ABOUT REDHAT

cat

CAT(1)									FSF								    CAT(1)

NAME

       cat - concatenate files and print on the standard output

SYNOPSIS

       cat [OPTION] [FILE]...

DESCRIPTION

       Concatenate FILE(s), or standard input, to standard output.

       -A, --show-all
	      equivalent to -vET

       -b, --number-nonblank
	      number nonblank output lines

       -e     equivalent to -vE

       -E, --show-ends
	      display $ at end of each line

       -n, --number
	      number all output lines

       -s, --squeeze-blank
	      never more than one single blank line

       -t     equivalent to -vT

       -T, --show-tabs
	      display TAB characters as ^I

       -u     (ignored)

       -v, --show-nonprinting
	      use ^ and M- notation, except for LFD and TAB

       --help display this help and exit

       --version
	      output version information and exit

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by Torbjorn Granlund and Richard M. Stallman.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for cat is maintained as a Texinfo manual.  If the info and cat programs are properly installed at  your	site,  the
       command

	      info cat

       should give you access to the complete manual.

cat (coreutils) 4.5.3						   February 2003							    CAT(1)
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