问题
So pretty simple question. All of the files in my directory are of the form 6bfefb348d746eca288c6d62f6ebec04_0.jpg. I want them to look like 6bfefb348d746eca288c6d62f6ebec04.jpg. Essentially, I want to take off the _0 at the end of every file name. How would I go about doing this with bash?
回答1:
With Perl's standalone rename command:
rename -n 's/..(\....)$/$1/' *
If everything looks fine, remove -n.
It is possible to use this standalone rename command with a syntax similar to sed's s/regexp/replacement/ command. In regex a . matches one character. \. matches a . and $ matches end of line (here end of filename). ( and ) are special characters in regex to mark a subexpression (here one . and three characters at the end of your filename) which then can be reused with $1. sed uses \1 for first back-reference, rename uses $1.
See: Back-references and Subexpressions with sed
来源：https://stackoverflow.com/questions/46205296/how-do-i-truncate-the-last-two-characters-of-all-files-in-a-directory