這篇文章主要介紹了Linux常用命令fold怎么用，具有一定借鑒價值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。
fold [-bs][-w][--help][--version][文件...]
參數：
-b或–bytes 以Byte為單位計算列寬，而非采用行數編號為單位。
-s或–spaces 以空格字符作為換列點。
-w或–width 設置每列的最大行數。
–help 在線幫助。
–version 顯示版本信息。
將一個名為testfile 的文件的行折疊成寬度為30，可使用如下命令：
fold -w 30 testfile
為了對比，先將testfile文件輸出如下：
$ cat testfile #查看testfile 中的內容 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命令折疊顯示：
$ fold -w 30 testfile #行折疊成寬度為30，顯示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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