cat 命令

2016年6月8日 127条评论 7,530次阅读 0人点赞

cat 命令

cat命令的用途是连接文件或标准输入并打印。这个命令常用来显示文件内容，或者将几个文件连接起来显示，或者从标准输入读取内容并显示，它常与重定向符号配合使用。

1．命令格式：cat [选项] [文件]…

2．命令功能：cat主要有三大功能：

1.一次显示整个文件:cat filename

2.从键盘创建一个文件:cat > filename 只能创建新文件,不能编辑已有文件.

3.将几个文件合并为一个文件:cat file1 file2 > file

3．命令参数：

-A, –show-all           等价于 -vET

-b, –number-nonblank    对非空输出行编号

-e                       等价于 -vE

-E, –show-ends          在每行结束处显示 $

-n, –number     对输出的所有行编号,由1开始对所有输出的行数编号

-s, –squeeze-blank  有连续两行以上的空白行，就代换为一行的空白行

-t                       与 -vT 等价

-T, –show-tabs          将跳格字符显示为 ^I

-u                       (被忽略)

-v, –show-nonprinting   使用 ^ 和 M- 引用，除了 LFD 和 TAB 之外

测试：cat demo.c 测试成功回显demo文件内容

cat -n demo.c demov.c 测试失败原因：无demov.c文件

touch demov.c 创建文件

cat -n demo.c demov.c 测试成功回显如下代码：

1 #include &lt;stdio.h&gt;
2 int sum(int,int);
3 int main()
4 {
5 int result;
6 int a=1,b=2;
7 result = sum(a,b);
8 printf("%d + %d = %d\n",a,b,result);
9 return 0;
10 }
11 int sum(int a,int b)
12 {
13
14 return a+b;
15
16 }

同理 cat -n demo.c > 1.c 测试成功

把加入行号的c语言程序放入1.c内 1.c文件没有会自动生成上面的方法则不能需要有文件才可以！

高级用法：

cat >file.txt <<EOF

>123
> fgfdg
> fdgdfg
> fdgdfg
> fgdg
> dfg
> 234
> eof
> EOF

cat file.txt 测试成功回显 file内容

tac file.txt 反向输出！

本作品采用知识共享署名-相同方式共享 4.0 国际许可协议进行许可

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cat 命令

本作品采用知识共享署名-相同方式共享 4.0 国际许可协议进行许可

发表回复

Welcome To Heike07's Blog.

本作品采用 知识共享署名-相同方式共享 4.0 国际许可协议 进行许可

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本作品采用知识共享署名-相同方式共享 4.0 国际许可协议进行许可