The Cygwin FAQ says that there is no `su' command in recent versions of Cygwin, The sh-utils package, however, currently contains an `su' command, but it doesn't work. The shell transcript below illustrates the problem. You have to trust me that I offer the same password to `su' as I do to `ssh'.
[vav] swift> hostname; uname -a vav CYGWIN_NT-5.1 vav 1.5.5(0.94/3/2) 2003-09-20 16:31 i686 unknown unknown Cygwin [vav] swift> whoami swift [vav] swift> su kate Password: su: incorrect password [vav] swift> whoami swift [vav] swift> ssh [EMAIL PROTECTED] [EMAIL PROTECTED]'s password: [vav] kate> whoami kate [vav] kate> exit logout Connection to vav closed. [vav] swift> whoami swift [vav] swift> [vav] swift> cygcheck /usr/bin/su.exe C:/cygwin/bin/su.exe C:\WINNT\System32\KERNEL32.dll C:\WINNT\System32\ntdll.dll C:/cygwin/bin\cygwin1.dll C:/cygwin/bin\cygintl-2.dll C:/cygwin/bin\cygiconv-2.dll [vav] swift> cygcheck -f /usr/bin/su.exe sh-utils-2.0.15-4 [vav] swift> cygcheck -c sh-utils Cygwin Package Information Package Version Status sh-utils 2.0.15-4 OK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/