Linux Shell Scripting Cookbook - Third Edition

How it works...

The previous script uses a for loop to iterate through the names of all files ending with a .jpg or .png extension. The find command performs this search, using the -o option to specify multiple -iname options for case-insensitive matches. The -maxdepth 1 option restricts the search to the current directory, not any subdirectories.

The count variable is initialized to 1 to track the image number. Then the script renames the file using the mv command. The new name of the file is constructed using ${img##*.}, which parses the extension of the filename currently being processed (refer to the Slicing filenames based on extensions recipe in this chapter for an interpretation of ${img##*.}).

let count++ is used to increment the ...