4种shell的区别.pdf

4 种 shell 的区别 C Shell 、TC Shell B shell K shell Bash shell shbang 行 #!/bin/csh #!/bin/tcsh #!/bin/sh #!/bin/ksh #!/bin/bsh 注释 # This is a comment # This is a comment #This is a comment #This is a comment 通配符 必须用反斜杠或引号引用 echo “how are you?” echo how are you \? 必须被引号引用 echo “how are you?” 必须被引号引用 echo “how are you?” 必须被引号引用 echo “how are you?” 显示输出 echo “how are you” echo “how are you?” echo “how are you?” print “how are you?” echo “how are you?” 局部变量 set variable_name=value set name=”Tom” variable_name=value name=”Tom” variable_name=value typeset variable_name=value name=”Tom” variable_name=valve declare variable_name=value name=”Tom” 全局变量 setenv VARIABKE value setenv PRINTER Tom VARIABLE_NAME=value export VARIABLE_NAME PATH=/bin export PATH export VARIABLE_NAME=value export PATH=/bin export VARIABLE_NAME=value declare –x VARIABLE_NAME=value 提取变量值 echo $variable_name echo $name echo $PRINTER echo $variable_name echo $name echo $PATH echo $variable_name echo $name echo $PATH echo $variable_name echo $name echo $PATH 读取用户输入 echo “what’s your name?” set name=$ echo “What’s your name?” read name read name1 name2 … read name?”what’s your name?” 引号内部是提示信息 print –n “What’s your name?” echo “What’s your name?” read name read name1 name2 … read name read name1 name2 … 数组 set word_list = (word1 word2 word3) set names =(Tom Dick Harry) 下标从 1 开始 echo $names[1] echo $names set word1 word2 word3 set apples pears peaches echo $1 $2 $3 set –A array_name word1 word2 word3… set –A fruit apples pears peaches print ${fruit[0]} 下标从 0 开始 $(fruit[1])}=oranges 赋一个新值 set apples pears peaches ( positional parameters) echo $1 $2 $3 declare –a array_name=( word1 word2 word3…) declare –a fruit=( apples pears peaches) echo ${fruit[0]} 命令替换 由反引号引用 ` ` set now =`date` echo $now echo “Today is `date`” 由反引号引用 ` ` set now =`date` echo $now echo “Today is `date`” variable_name=`comman