Bash - 遍历文件，排除目录

Question

I'm trying to rename files in a directory to lowercase. I need to loop through their names. I tried:

for i in *;

But this iterates over files and directories. How do I make it, so that it only iterates through the files?

Answer 1

Test if it is a file, and then do your command. If it isn't a file, the && will short circuit and the second part will not be executed.

for i in *; do [[ -f "$i" ]] && echo "$i"; done

Answer 2

Years after the answer from Doon, I found an (arguably) nicer solution, based on this Ask Ubuntu answer . It does not require any test inside the body of the loop:

for fn in $(ls -p | grep -v /); do echo $fn; done

• ls -p will list out contents of the current directory, with / appended to directory names
• grep -v / will filter the output, removing lines with /