search all files in a directory in Linux code example

Example 1: linux search all directories for file

find / -iname 'book1*'

Example 2: display all files in a directory linux

ls command list computer files in a directory in Unix OS with next structure:
ls [OPTION]... [FILE]...
Examples:
ls -l #display all files in current directory with  (-l) long format.
ls -a /directory #display all hidden files in given directory that start with .