dirname — get directory from filenames
dirs= dirname(files[,flag [,flagexpand]])
a string matrix giving a set of file names.
boolean optional parameters. (default value %t).
string matrices.
dirname return the dirname of the file entries given in files.
If flag is true the files are first converted to the target
type given by the MSDOS variable.
Moreover, if flagexpand is true leading strings like
HOME, SCI or ~ are expanded using environment
variables.
Note that dirname(files,%f) can give erroneous results if
pathnames given in files do not follow the convention
given by the MSDOS variable.