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• foreach command

When you want to change the extension of the files,
$>foreach i (*.jpg)
foreach> mv $i $i:s/.jpg/.JPG/<RET>
foreach> end<RET>

When you want to apply a command to multiple files,
$>foreach i (*.sdt)
foreach> sdt2spm $i:s/.sdt//<RET>
foreach> end<RET>