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Questions specific to GNU’s Bourne Again SHell, as opposed to other Bourne/POSIX shells. For questions about Unix shells in general, use the /shell tag instead.

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Use expr to get the last part of each name. I am assuming here that you know the prefix is "file1" otherwise you might need another loop. for f in $(ls file1.*) do suffix=`expr $f : '.*\.\(.*\)'` mv …
answered Sep 5 '15 by GregD