bdsh command options are polluted with command history

[Michal Koutny]

Version

Local build for ia32 from current mainline (2298). Also the official build of 0.6 and 0.5 (I didn't try older ones).

How to reproduce

In the fresh (/ is working directory) bdsh session type

ls -h<return>
<arrow-up><return>
ls app<return>

Output

• The first call just prints usage.
• The second call also prints usage.
• The third call outputs unknown option — p and lists the current (/) directory.

Expected output

• The first call just prints usage.
• The second call also prints usage.
• The third call lists content of the app directory.

[Luka Strižić]

This is fixed with the patch from #506.

[Jakub Jermář]

Closing as duplicate of #506.