compare two folder: diff -qr /path/to/folder1 /path/to/folder2
calculate TOTP: oathtool --totp -b -d 6 <secret-string>
copy folder with mode and timestamps preserverd (owership may be changed):
# folder1 will be copied to /path/to/folder2/folder1
#
# temporarily bypass an alias and use the non-aliased version of a command by prefixing it with \.
# If not prefix with backslash, cp may ask for confirmation before overwrite a file,