Gunzip multiple files and rename them

Question

I want to know whether it is possible to gunzip multiple files and rename them with one command/script.

I have a bunch of files in the format:

test.20120708191601.DAT.3599502593.gz
test.20120708201601.DAT.99932140.gz
test.20120708204600.DAT.1184686967.gz
test.20120708212100.DAT.824089664.gz
test.20120708215100.DAT.1286044098.gz
test.20120708222100.DAT.1414234861.gz

I need to gunzip them and remove everything after the .DAT, to be in the format:

test.20120708191601.DAT
test.20120708201601.DAT
test.20120708204600.DAT
test.20120708212100.DAT
test.20120708215100.DAT
test.20120708222100.DAT

Answer 1

Try this:

for file in *.gz; do
  gunzip -c "$file" > "${file/.DAT*/.DAT}"
done

The approach uses gunzip's option to output the uncompressed stream to standard output (-c), so we can redirect it to another file, without a second renaming call. The renaming is done on the filename variable itself, using bash substitution (match any globbing pattern .DAT* and replace it with .DAT). The loop itself just iterates over files in the current directory with names ending with .gz.