Increment one value in a text line, using script

I have a text file as input. I need to filter that through some program, SED, AWK, whatever, where i need to increment a value in a particular line every time i run the script.

What's the best way of doing it?

Sample text:

File Type Rev 100 data a data b file loc comment line eof 

only the "Rev 100" should change to "Rev 101"

2 Answers

cp textfile /tmp/textfile awk '{if ($1 == "Rev") printf("%s %d\n", $1, $2 + 1); else print $0;}' /tmp/textfile > textfile 

awk:

/^Rev / { print "Rev " $2+1 next } { print }