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====== BASH - Directories - Check if a directory exists ======

To check if a directory exists:

<code bash>
if [ -d "$DIRECTORY" ]; then
  # Control will enter here if $DIRECTORY exists.
fi
</code>

<WRAP important>
**WARNING:**  A symbolic link to a directory will also not work, for example:

<code bash>
ln -s "$ACTUAL_DIR" "$SYMLINK"
if [ -d "$SYMLINK" ]; then 
  rmdir "$SYMLINK" 
fi
</code>

Will produce the error message:

<code bash>
rmdir: failed to remove `symlink': Not a directory
</code>


So symbolic links may have to be treated differently, if subsequent commands expect directories:

<code bash>
if [ -d "$LINK_OR_DIR" ]; then 
  if [ -L "$LINK_OR_DIR" ]; then
    # It is a symlink!
    # Symbolic link specific commands go here.
    rm "$LINK_OR_DIR"
  else
    # It's a directory!
    # Directory command goes here.
    rmdir "$LINK_OR_DIR"
  fi
fi
</code>

</WRAP>

----

To check if a directory doesn't exist:

<code bash>
if [ ! -d "$DIRECTORY" ]; then
  # Control will enter here if $DIRECTORY doesn't exist.
fi
</code>