Bash and zsh both have a very neat feature for expanding a single word into more: brace expansion.
For the simplest example, imagine you need to move file.old as Normally you type:

$ mv file.old

Brace expansion can save you a little bit of typing:

$ mv file.{old,new}

The command actually executed will be identical to the previous one, “file.{old,new}” gets converted into “file.old”.

You can also provide a number range inside the brace:

% echo test{1..13}
test1 test2 test3 test4 test5 test6 test7 test8 test9 test10 test11 test12 test13

With a third parameter, the number will be increased by that much each time (step):

% echo test{1..13..2}
test1 test3 test5 test7 test9 test11 test13

Only a zsh feature is padding. You can add leading zeros to generated number to make them all the same (character) size, by adding zero(s) to the third parameter:

 % echo test{1..100..010} 
test001 test011 test021 test031 test041 test051 test061 test071 test081 test091

Zsh offers even more flexibility after setting BRACE_CCL option – you can use range of characters as well:

% setopt BRACE_CCL
% echo test{a-d} 
testa testb testc testd