awk command to split in to 2 files

m_subra_mani · #1 (**permalink**) 12-13-2005

Hi,
I have a problem in grepping a file for 2 strings and writing them to 2 appropriate files. I need to use the awk command and read the file only once and write to the appropriate file.
My file is very huge in size and it is taking a long time using cat command and grep command.
Can anyone help me with using the awk command for this?

akrathi · #2 (**permalink**) 12-13-2005

You may modify this to work for your requirement
Thanks
Ashok

awk '
{
if ( substr($0,1,1) == "A")
print $0 >>FILE1
if ( substr($0,1,1) == "B")
print $0 >>FILE1

}' FILE1="file_1" FILE2="file_2" test.data
~

reborg · #3 (**permalink**) 12-13-2005

If your file is really as big as you suggest you would get much better performance using perl.

Just Ice · #4 (**permalink**) 12-13-2005

instead of using a cat and then a grep --- just grep directly out of the file ...

Code:

this ...
    grep string /dir/file

not this ...
    cat /dir/file | grep string

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