Use `grep -v ‘^#’ file`
Use `grep -v ‘^[[:space:]]*#’ file`
Use `grep -v ‘^[[:space:]]*$’ file`
Use `grep -v -E ‘^[[:space:]]*(#|$)’ file`
Use `grep ‘pattern’ file`
Use `grep -n ‘pattern’ file`
Use `grep -i ‘pattern’ file`
Use `grep -r ‘pattern’ directory/`
Use `grep -v ‘^#’ file | grep ‘pattern’`
Use `grep -E ‘^[[:space:]]*[^#[:space:]]’ file`
