Bash command to move only some files?

Question

Let's say I have the following files in my current directory:

1.jpg
1original.jpg
2.jpg
2original.jpg
3.jpg
4.jpg

Is there a terminal/bash/linux command that can do something like

if the file [an integer]original.jpg exists,
    then move [an integer].jpg and [an integer]original.jpg to another directory.

Executing such a command will cause 1.jpg, 1original.jpg, 2.jpg and 2original.jpg to be in their own directory.

NOTE This doesn't have to be one command. I can be a combination of simple commands. Maybe something like copy original files to a new directory. Then do some regular expression filter on files in the newdir to get a list of file names from old directory that still need to be copied over etc..

Answer 1

Turning on extended glob support will allow you to write a regular-expression-like pattern. This can handle files with multi-digit integers, such as '87.jpg' and '87original.jpg'. Bash parameter expansion can then be used to strip "original" from the name of a found file to allow you to move the two related files together.

shopt -s extglob
for f in +([[:digit:]])original.jpg; do
    mv $f ${f/original/} otherDirectory
done

---

In an extended pattern, +( x ) matches one or more of the things inside the parentheses, analogous to the regular expression x+. Here, x is any digit. Therefore, we match all files in the current directory whose name consists of 1 or more digits followed by "original.jpg".

${f/original/} is an example of bash's pattern substitution. It removes the first occurrence of the string "original" from the value of f. So if f is the string "1original.jpg", then ${f/original/} is the string "1.jpg".