Linux command-shopt

shopt command

The shopt command is used to display and set the behavior options in the shell to enhance the shell's ease of use.

Open and close

Open shopt command: shopt-u extglob

After opening, the following 5 pattern matching operators will be identified:

• ? (pattern-list)-The given pattern is matched 0 or 1 times;
• * (Pattern-list)-The given pattern matches more than 0 times including 0 times;
• + (Pattern-list)-The given pattern matches more than 1 times including 1 times;
• @ (Pattern-list)-The given mode only matches 1 times;
• ! (pattern-list)-does not match the given pattern in parentheses.

Instance:

Delete files with file names that do not end in JPG:

Delete files with file names ending in jpg or PNG:

RM-RF *@ (jpg|png)

Linux command-shopt