一、Shell简介：啥是Shell，Shell命令的两种履行方法1二、几种常见的Shell1三、Shell脚本言语与编译型言语的差异2四、啥时候使用Shell3五、第一个Shell脚本3六、Shell变量：Shell变量的定义、删去变量、只读变量、变量类型5七、Shell特别变量：Shell$0,$#,$
,$@,$?,$$和命令行参数6八、Shell更换：Shell变量更换，命令更换，转义字符9九、Shell运算符：Shell管用运算符、关系运算符、布尔运算符、字符串运算符12十、Shell注释20十一、Shell字符串20十二、Shell数组：shell数组的定义、数组长度21十三、Shellecho命令23十四、shellprintf命令：格式化输出句子24十五、Shellifelse句子25十六、Shellcaseesac句子28十七、Shellfor循环30十八、Shellwhile循环31十九、Shelluntil循环32二十、Shellbreak和continue命令33二十一、Shell函数：Shell函数返回值、删去函数、在终端调用函数35二十二、Shell函数参数37二十三、Shell输入输出重定向：ShellHereDocument，/dev/null文件38二十四、Shell文件包括41
(1. Introduction to Shell: what is Shell, two execution methods of Shell commands 6. Shell variables: Definition of Shell variables, deletion of variables, read-only variables, variable type 5 7. Shell special variables: Shell $0, $#, $
,$@,$?,$$ and command line parameters String Operator 12 Ten, Shell Comment 20 Eleven, Shell String 20 Twelve, Shell Array: Definition of Shell Array, Array Length 21 Thirteen, Shellecho Command 23 Fourteen, Shellprintf Command: Formatted Output Sentence 24 fifteen, Shellifelse sentence 2516, Shellcaseesac sentence 2877, Shellfor loop 3018, Shellwhile loop 319, Shelluntil loop 3220, Shellbreak and continue command 3321, Shell function: Shell function return value, delete function , Call function 3522 in the terminal, Shell function parameter 3723, Shell input and output redirection: ShellHereDocument, /dev/null file 3824, Shell file includes 41)
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