文件名的通配符拓展

当进行文件名的通配符扩展时，请使用明确的路径。 因为文件名可能以 - 开头，所以使用扩展通配符 ./ 比 来得安全得多。

# Here's the contents of the directory:
# -f  -r  somedir  somefile

# This deletes almost everything in the directory by force
psa@bilby$ rm -v *
removed directory: `somedir'
removed `somefile'

# As opposed to:
psa@bilby$ rm -v ./*
removed `./-f'
removed `./-r'
rm: cannot remove `./somedir': Is a directory
removed `./somefile'