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4.5 流程控制语句和其他高级程序设计语言一样，Shell提供了用来控制程序和执行流程的命令，包括条件分支和循环结构，用户可以用这些命令创建复杂的程序。与传统语言不同的是，Shell用于指定条件值的不是布尔运算式，而是命令和字符串。4.5.1 Ifif [条件表达式] then 语句序列 ...

Linux从入门到精通（十二）——shell编程中

4. shell基本语法在shell中使用read命令从标准输入读入数据，并将该数据赋值给变量；使用echo命令实现换行标准输出操作。在进行计算整数变量值时，可以使用expr表达式，let命令，$()形式和$[]形式实现。 test是Shell程序中的一个表达式，通过和Shell 提供的if...

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Linux从入门到精通（九）——Linux编程下

6. gdb调试器 GDB是GNU开源组织发布的一个强大的Linux下的程序调试工具，它是一种强大的命令行调试工具。。一个合格的调试器需要有以下几项基本功能：能够运行程序，设置所有能影响程序运行的参数；能够让程序让指定的条件下停止。能够在程序停止时检查所有参数的情况。能够根据指定条件改变程序的运行。...

Linux从入门到精通（九）——Linux编程中

5. gcc编译器 GNU CC (简称为 gcc)是GNU项目中符合ANSIC标准的编译系统，能够编译用 C、C++和ObjectC等语言编写的程序。 gcc不仅功能强大，而且可以编译如 C、 C++、Object C、Java、 Fortran、 Pascal Modula-3和 Ada等多种...

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