ftp> cd private
257 "/" is the current directory.
ftp> dir
226 Transfer complete.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> cd /private
226 Transfer complete.
ftp> dir
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
250 CWD command successful.
ftp> ls -l
257 "/private" is the current directory.
200 PORT command successful.
ftp> dir
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> get etc
local: etc remote: etc
200 PORT command successful.
226 Transfer complete.
ftp> ls -l
257 "/private" is the current directory.
200 PORT command successful.
ftp> di
?Ambiguous command.
ftp> dir
226 Transfer complete.
200 PORT command successful.
ftp> dir
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> pwd
Unable to determine remote directory
ftp> ls
200 PORT command successful.
150 Opening ASCII mode data connection for '/bin/ls'.
total 2
drwxr-xr-x    15 root wheel        578 Mar 24 20:50 etc
drwxr-xr-x    17 root wheel        952 Mar 24 20:50 var
226 Transfer complete.
WARNING! 2 bare linefeeds received in ASCII mode.
File may not have transferred correctly.
ftp> dir
200 PORT command successful.
226 Transfer complete.
ftp> ls
200 Type set to  I.
200 PORT command successful.
ftp> ls
550 etc: Not a plain file.
226 Transfer complete.
ftp> ls
200 Type set to  A.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
226 Transfer complete.
257 "/private" is the current directory.
ftp> ls
200 PORT command successful.
150 Opening ASCII mode data connection for '/bin/ls'.
total 2
drwxr-xr-x    15 root wheel        578 Mar 24 20:50 etc
drwxr-xr-x    17 root wheel        952 Mar 24 20:50 var
226 Transfer complete.
WARNING! 2 bare linefeeds received in ASCII mode.
File may not have transferred correctly.
ftp> ls
200 PORT command successful.
150 Opening ASCII mode data connection for '/bin/ls'.
total 2
drwxr-xr-x    15 root wheel        578 Mar 24 20:50 etc
drwxr-xr-x    17 root wheel        952 Mar 24 20:50 var
226 Transfer complete.
WARNING! 2 bare linefeeds received in ASCII mode.
File may not have transferred correctly.
ftp> pwd
Unable to determine remote directory
ftp> pwd
Unable to determine remote directory
ftp> pwd
Unable to determine remote directory
ftp> pwd
Unable to determine remote directory
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> ls
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
200 PORT command successful.
ftp> dir
150 Opening ASCII mode data connection for '/bin/ls'.
ftp> ls
226 Transfer complete.
ftp> ls
Not connected.
ftp> dir
Not connected.
ftp> quit