Using find to run a command on multiple files

Find has an -exec action for running a command against found files.

# create backups of all markdown files
find . -type f -name '*.md' -exec cp {} {}.bak \;

The command will be executed for each found file. The construct '{}' will be replaced by the current file name. The command must be terminated with a semi-colon that must be escaped to protect it from interpretation by the shell.

A word of caution

There are both security and performance implications which may be mitigated by using one of the variations -exec command {} +, -execdir command or -execdir command {} +.

Source: man find