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Oh, sorry. remove the word "echo".

cat shows the commands.

sh runs the commands.

I'd suggest piping it into 'cat' instead of 'sh' first, to see if what it prints makes any sense.

You can try this in working directory :

ls -1 | sed 's/\(^0\{1,4\}\)\([0-9][0-9]\)\(.*\)/mv & newa0\2.abc/ ' # | sh


After checkin the output pipe it to sh (remove the #) :p

POSIX:
$ f=000012ABCDEFGHIJ.XXX.YYY.ZZZ
$ f=${f%${f#??????}}
$ echo "newa${f#???}.abc"
newa012.abc