The `shopt -s globstar nullglob` command is used in Bash shell to enable two shell options - `globstar` and `nullglob`.

`globstar` enables the use of double asterisk ** as a filename expansion operator. It allows you to recursively match all files and directories in a directory and its subdirectories. For example, `ls **/*.txt` will list all the txt files in current directory and all its subdirectories.

`nullglob` allows non-matching globs to expand to null strings instead of the glob pattern itself. For example, if you run `echo *.txt` in a directory with no txt files, it will just output `*.txt`. But with `nullglob` enabled, it will output nothing.

Together, these two options can be very useful for globbing patterns with varying levels of recursion, especially when combined with other tools and commands in a shell pipeline.
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