Linux 命令大全
Linux fold命令用于限制文件列寬。
為了解決多讀取的eof字符(在文件中不可見)linux命令，我們用一個小小的邏輯算法來避免eof字符帶來的困惑，如打印讀取的文件內容時不將讀取到的eof字符輸出，或避免在讀取到eof字符（讀取此字符不成功）后無判斷文件是否結束的操作而又將上一次讀取到的數據輸出。軟件功能：1.可以定位模擬操作任何窗口包括最小化和隱藏的窗口2.支持代理換ip和撥號換ip3.自動打碼（圖片驗證碼自動識別 ）4.運行任意程序文件5.強大的標準式和正則表達式文件提取功能6.自動鼠標點擊操作7.支持固定時間和隨機時間停頓8.隨機字符自動填寫9.鍵盤按鍵模擬（包括單鍵和系統(tǒng)組合鍵）10.向指定區(qū)域快速發(fā)送文本內容11.批量進行軟件登錄操作12.快速文本存在判斷13.網頁鏈接提取和元素操作（網頁文本輸入和按鈕點擊）14.文本拷貝（自動拷貝文本到剪切板）15.指定窗體自動關閉16.結束進程17.自動打開網頁18.清除internet臨時文件更新日志：1、修正了內部操作中執(zhí)行腳本列表的bug2、修正了讀取文本列表5數據失敗的bug3、添加了網頁操作中發(fā)送文本使用變量“自動編號”（比如有些input標簽沒有name或者id參數又有其他很多相同的input標簽程序無法定位。在讀取文件時，不僅要注意行結束符號“\n”，程序也需要一種標準的方式來識別何時到達文件的末尾，這個標準通常成為eof（end of file）字符。
fold [-bs][-w<每列行數>][--help][--version][文件...]
參數：
將一個名為testfile 的文件的行折疊成寬度為30linux命令，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
Linux 命令大全
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