Tcl之Intro

　　Tool command language, a widely used scripting tool that was deveoped for controlling and extending appliations.

1　　Run

　　When you have installed Tcl, the program you will then call to utilize it is tclsh.

　　For instance, if you write some code to a file "hello.tcl", and you want to execute it, you would do it like so: tclsh hello.tcl

2　　UNIX Tcl scripts (type "tclsh")

　　　1)　puts - writes the string to I/O steam

 puts "Hello, World - In quotes"    ; # This is a comment after the command.
 puts {Hello, World - In Braces}
 puts {Bad comment syntax example}   # *Error* - there is no semicolon 

 puts "line 1"; puts "line 2"

 puts "Hello, World; - With  a semicolon inside the quotes"

 # Words don't need to be quoted unless they contain white space:
 puts HelloWorld

　　　2)　set - assign a value to a variable

　　The dollar sign $ tells Tcl to use the value of the variable - in this case X or Y.

 set X "This is a string"

 set Y 1.24

 puts $X
 puts $Y

 puts "..............................."

 set label "The value in Y is: "
 puts "$label $Y"