Date: 2016may4 OS: Linux Language: bash Q. bash: What's the best way to ensure a directory exists in a bash script? A. Like this:

mydir=/usr/local/one/two/three if [[ ! -d $mydir ]]; then mkdir -p $mydir || exit 1 fi

We make the folder if it doesn't exist. When making it we use the -p option to mkdir which will make its parents if necessary. The idiom || exit means we'll exist the script if we can't make the folder.