This should be obvious after you think of it, but it is a honest mistake and cleaning up the mess afterwards can cause you big problems, so here it is:
some_command --base=~/Sites/diris very different from
some_command --base ~/Sites/dir
= makes all the difference. With it, the
~/ is not expanded to your
$HOME by the bash shell, so if your
some_command uses that path as a base directory, you'll end up with a new path like
This means that in your current working directory, you'll have a subdirectory named
~, and you might be tempted to just
rm -rf ~ to clean it up...
I think that we can all agree that a
rm -rf ~ command would be disastrous (the correct command would be
rm -rf ./~), so please be careful when using options with parameters. The
= will disable shell expansion, and you could end up in a bad place.