【TCL and Expect 】 review

1. 首先还是从 helloworld 的实例学起

example-1

puts "Hello, World " #In quotes puts {Hello, World } #- In Braces puts HelloWorld #如果在字符串中包含 white space 就需要使用 引号 或大括号来处理

2. 简单的赋值， TCL 把所有的变量都作为string 来处理

example-2

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"

3. 常用的转义字符

String	Output	Hex Value
/a	Audible Bell	0x07
/b	Backspace	0x08
/f	Form Feed (clear screen)	0x0c
/n	New Line	0x0a
/r	Carriage Return	0x0d
/t	Tab	0x09
/v	Vertical Tab	0x0b
/0dd	Octal Value	d is a digit from 0-7
/uHHHH	H is a hex digit 0-9,A-F,a-f. This represents a 16-bit Unicode character.
/xHH....	Hex Value	H is a hex digit 0-9,A-F,a-f. Note that the /x substitution "keeps going" as long as it has hex digits, and only uses the last two, meaning that /xaa and /xaaaa are equal, and that /xaaAnd anyway will "eat" the A of "And". Using the /u notation is probably a better idea.

example—3

set Z Albany set Z_LABEL "The Capitol of New York is: " puts "$Z_LABEL $Z" ;# Prints the value of Z puts "$Z_LABEL /$Z" ;# Prints a literal $Z instead of the value of Z puts "/nBen Franklin is on the /$100.00 bill" set a 100.00 puts "Washington is not on the $a bill" ;# This is not what you want puts "Lincoln is not on the $$a bill" ;# This is OK puts "Hamilton is not on the /$a bill" ;# This is not what you want puts "Ben Franklin is on the /$$a bill" ;# But, this is OK puts "/n................. examples of escape strings" puts "Tab/tTab/tTab" puts "This string prints out /non two lines" puts "This string comes out/ on a single line"