SHELL

get files in directory bash

ls | wc -l #Count files on current directory
ls path/to/dir | wc -l #Count files on specific directory path

bash find file in directory

$ ls -R | grep -i "pattern"

bash find file

# syntax 
# find *</path/to/dir> '(' *<filter-1> -o *<filter-2> ')'

# example 
find . '(' -name '*ERR5312209.zip' -o -name '*ERR5312209.TXT' ')'