Shlomi has given an all in one command which assumes a unix-like environment, but I suspect because "cmd" is mentioned that Asaf's on windows.
While I like, and use, single line do-it-all-at-once solutions, when there's a bunch of stuff one doesn't want to lose, or there's other pressures, a step by simple step approach, where one sees each step's results, can be good.
So, I'd first create a file with the list of the file names. On windows, that would be, in a command window having changed to the right directory:
dir /b *.tec > photos.bat
(from rusty windows memory, we want a single column of file names, with no spaces at the beginning of each line)
Then, open photos.bat in vim, and duplicate each name with two spaces between them:
:%s/.*/& &/
delete the first 6 characters after the spaces
:%s/ ....../ /
delete the first character before the dot at the end
:%s/.\.tec$/.tec/
change tec to jpg:
:%s/tec$/jpg/
add a rename command to the beginning of each line
:%s/^/ren /
save the file, exit vim, and run the batch file
$ photos.bat
On *n*x the first command would have "ls" instead of "dir /b", "ren" would be "mv", and the last would be
$ sh photos.bat
HTH, and regards, John Little
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