List frequently used directories
The frequently used directories are stored in file ~/gensys/.gensys/gencd (alt. ~/.gensys/gencd).
To add a new directory use option --add
To remove a directory use option --del
In case file ~/gensys/.gensys/gencd is very large,
the output can be filtered by giving a search [string].
Following options are understood:
-h = Writes this help text
--add= Adds "string" to ~/.gensys/gencd (If string is set equal to "."
current directory will be added to ~/.gensys/gencd)
--del= Removes "string" from ~/.gensys/gencd