Linux常用命令fold命令具体使用方法

Linux常用命令fold命令用于限制文件列宽，fold指令会从指定的文件里读取内容，将超过限定列宽的列加入增列字符后，输出到标准输出设备，下面良许教程网为大家分享一下Linux常用命令fold命令具体使用方法。

语法

 fold [-bs][-w][--help][--version][文件...]

参数：

• -b或–bytes 以Byte为单位计算列宽，而非采用行数编号为单位。

• -s或–spaces 以空格字符作为换列点。

• -w或–width 设置每列的最大行数。

• –help 在线帮助。

• –version 显示版本信息。

实例

将一个名为testfile 的文件的行折叠成宽度为30，可使用如下命令：

 fold -w 30 testfile

为了对比，先将testfile文件输出如下：

 $ cat testfile #查看testfile 中的内容  
 Linux networks are becoming more and more common, but
 security is often an overlooked  
 issue. Unfortunately, in today’s environment all networks
 are potential hacker targets,  
 from top-secret military research networks to small home LANs.  
 Linux Network Security focuses on securing Linux in a
 networked environment, where the  
 security of the entire network needs to be considered
 rather than just isolated machines.  
 It uses a mix of theory and practical techniques to
 teach administrators how to install and  
 use security applications, as well as how the
 applications work and why they are necessary.

然后使用fold命令折叠显示：

 $ fold -w 30 testfile #行折叠成宽度为30，显示testfile 文件  
 Linux networks are becoming mo  
 re and more common, but securi  
 ty is often an overlooked issu  
 e. Unfortunately, in today’s  
 environment all networks are  
 potential hacker targets, from  
 top-secret military research  
 networks to small home LANs.  
 Linux Network Security focuses  
 on securing Linux in a networ  
 ked environment, where the sec  
 urity of the entire network ne  
 eds to be considered rather th  
 an just isolated machines. It  
 uses a mix of theory and pract  
 ical techniques to teach admin  
 istrators how to install and u  
 se security applications, as w  
 ell as how the applications wo  
 rk and why they are necessary

至此关于Linux常用命令fold命令的使用方法分享结束，大家如果对fold命令的使用方法还有问题可以通过评论区将问题提交我们。

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