# In this shell script, we will try creating and removing
# directories, and look at listing their content. We already know
# most of the commands involved, so this will be mainly review.

set -x # let's ask the shell to print commands for us

# We first create and enter a scratch directory (it is an error if
# it already exists)

mkdir scratch ; cd scratch

# The ‹-p› switch to ‹mkdir› tells it to create any missing parent
# directories. It is also not an error if the target directory
# already exists, in this case.

mkdir -p some/subdir
mkdir -p some

# We also know how to list directory contents, using ‹ls›:

ls some

# The ‹rmdir› command is the inverse of ‹mkdir›: it will remove an
# empty directory; it is an error if the directory is not empty,
# see:

rmdir some

# However, those are okay:

rmdir some/subdir
rmdir some

cd ..
rmdir scratch

# Let's move on to the C programs again: we'll now look at
# ‹rmmkdir.c›. We will skip ‹ls› for now because it's a little more
# complicated. But we will get to it near the end of the seminar
# today.