awk command to split in to 2 files

Shell Programming and Scripting
1

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?

2

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

~

3

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

4

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

this ...
    grep string /dir/file

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