rename - How to zero pad numbers in file names in Bash?

Question

What is the best way, using Bash, to rename files in the form:

(foo1, foo2, ..., foo1300, ..., fooN)

With zero-padded file names:

(foo00001, foo00002, ..., foo01300, ..., fooN)

Answer 1

It's not pure bash, but much easier with the Perl version of rename:

rename 's/d+/sprintf("%05d",$&)/e' foo*

Where 's/d+/sprintf("%05d",$&)/e' is the Perl replace regular expression.

• d+ will match the first set of numbers (at least one number)
• sprintf("%05d",$&) will pass the matched numbers to Perl's sprintf, and %05d will pad to five digits