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Full Discussion: Merging two files with same name
Top Forums Shell Programming and Scripting Merging two files with same name Post 302430437 by Scott on Thursday 17th of June 2010 02:59:08 PM
Old 06-17-2010
One way, assuming A and B directories are in the current directory, and that A and B contain only files:

Code:
ls A | sed "s|.*|cat A/& >> B/&|" | sh

Code:
$ ls A
1.txt	2.txt	3.txt

$ cat A/1.txt
1

$ ls B
1.txt	2.txt	3.txt

$ cat B/1.txt
a

#... etc...

$ ls A | xargs -I{} cat A/{}
1
2
3

$ ls B | xargs -I{} cat B/{}
a
b
c

$ ls A | sed "s|.*|cat A/& >> B/&|" | sh

$ ls B | xargs -I{} cat B/{}            
a
1
b
2
c
3

Or probably simpler with a loop:
Code:
ls A | while read FILE; do
  cat A/"$FILE" >> B/"$FILE"
done

Last edited by Scott; 06-17-2010 at 04:09 PM..
This User Gave Thanks to Scott For This Post:
jaysean
 

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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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