snipplets.dev/code/Bash/file_folder_exists.sh

#!/bin/sh

# Check file exists
FILE=/etc/resolv.conf

if [ -f "$FILE" ]; then
    echo "$FILE exists."
else
    echo "$FILE does not exist."
fi

# OR

[ -f /etc/resolv.conf ] && echo "/etc/resolv.conf exists."

# Check directory exists
DIR=/etc/docker

if [ -d "$DIR" ]; then
    echo "$DIR is a directory."
fi

# OR

[ -d /etc/docker ] && echo "/etc/docker is a directory."