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Full Discussion: multiple file processing
Top Forums UNIX for Dummies Questions & Answers multiple file processing Post 35765 by oombera on Friday 2nd of May 2003 04:27:39 PM
Old 05-02-2003
Which block of code are you referring to?

In the first one, we list all the files and the xargs program tells the shell to concatenate everything into one big file. Any messages that would display (such as cat: input/output files 'bigFile' identical if bigFile is in the same directory as the files being concatenated) are sent to /dev/null so you don't see anything on screen..

In the second one, cat takes two files -- bigFile and $fn -- and concatenates them together into TMP_00.. remember, that's the whole purpose of "cat"!

Last edited by oombera; 02-18-2004 at 10:35 PM..
 

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cat(1)							      General Commands Manual							    cat(1)

Name
       cat - concatenate and print data

Syntax
       cat [ -b ] [ -e ] [ -n ] [ -s ] [ -t ] [ -u ] [ -v ] file...

Description
       The  command reads each file in sequence and displays it on the standard output.  Therefore, to display the file on the standard output you
       type:
       cat file
       To concatenate two files and place the result on the third you type:
       cat file1 file2 > file3
       To concatenate two files and append them to a third you type:
       cat file1 file2 >> file3
       If no input file is given, or if a minus sign (-) is encountered as an argument, reads from the standard input file.  Output is buffered in
       1024-byte blocks unless the standard output is a terminal, in which case it is line buffered.  The utility supports the processing of 8-bit
       characters.

Options
       -b   Ignores blank lines and precedes each output line with its line number.

       -e   Displays a dollar sign ($) at the end of each output line.

       -n   Precedes all output lines (including blank lines) with line numbers.

       -s   Squeezes adjacent blank lines from output and single spaces output.

       -t   Displays non-printing characters (including tabs) in output.  In addition to those representations used with the -v  option,  all  tab
	    characters are displayed as ^I.

       -u   Unbuffers output.

       -v   Displays  non-printing  characters (excluding tabs and newline) as the ^x.	If the character is in the range octal 0177 to octal 0241,
	    it is displayed as M-x. The delete character (octal 0177) displays as ^?.  For example, is displayed as ^X.

See Also
       cp(1), ex(1), more(1), pr(1), tail(1)

																	    cat(1)
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