Shell Programming and Scripting

Hi,

I am trying to insert a "_" character in front of capital letters in a string. For instance:

Code:

HappyDaysAreHereAgain

needs to become

Code:

Happy_Days_Are_Here_Again

I know how to do this with sed, but I am writing an awk script, which does several things. Also, I have already set FS in order to extract my title case string. I was thinking something like this, but it doesn't match on [A-Z].

Code:

BEGIN{FS="."}
...
{
    name=$2":"$3
    gsub("[A-Z]", "_&", name);
    print name;
}
...

Any ideas?
Cheers,
Kato

Try:

Code:

gsub ("[[:upper:]]", "_&",name);
sub("^_","",name)

Thanks Bartus, that works fine, I forgot about those char classes. Any idea why [A-Z] didn't match?

Code:

sed 's/[A-Z]/_&/g;s/^_//' infile

No idea. It is weird for me too.

Works fine with Solaris' "nawk".

I tested on Linux

Code:

$ awk --version
GNU Awk 3.1.5
Copyright (C) 1989, 1991-2005 Free Software Foundation.
...