1[Excerpted from the README:]  "scponly" is an alternative "shell" (of sorts)
2for system administrators who would like to provide access to remote users to
3both read and write local files without providing any remote execution
4privileges.  Functionally, it is best described as a wrapper to the
5tried-and-true ssh suite.
6
7scponly validates remote requests by examining the third argument passed to the
8shell upon login.  (The first argument is the shell itself, and the second is
9-c.)  The only commands allowed are "scp", "sftp-server" and "ls".  Arguments
10to these commands are passed along unmolested.
11