expect是tcl的扩展-因此，您可以使用tcl的编程结构-其中包括'if'.

expect is an extension of tcl - therefore you can use the programming constructs of tcl - these include 'if'.

可以使用Tcl命令手册页:tcl. tk/man/tcl8.5/TclCmd/contents.htm

Tcl command man pages are available: tcl.tk/man/tcl8.5/TclCmd/contents.htm