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WHY do you insist on xargs? You have received some proposals working entirely without it, although they may be somewhat off target as the target is not THAT clear. perl, sed, awk - they all will do...

OK. I completely misunderstood your example. I thought your field separator was <semicolon>, but now I'm guessing that <tab> is your field separator, and <semicolon> is a subfield separator in your...

The 1st post in this thread explicitly requested that every field in your input files be searched for PVALUE=number. But, the sample data provided never shows more than once such string on an input...

xargs won't help you here. It will put the file names found onto the command line as parameters to awk, like the shell does in above proposal. In either case, awk will work on that input stream...

I'm not at all sure that I understand what you're trying to do here. And saying you're getting an error message without showing us the exact error you're getting leaves us with a lot of guess work. ...