Linux常用命令fold怎么用

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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。

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

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