zoukankan      html  css  js  c++  java
  • 用UNIX的cat命令用于给文本加行号 (转载)

    转载:http://blog.csdn.net/vicant/article/details/2317721

    有时候需要给文本加上行号,用UNIX的cat命令可以进行这项工作。

    cat命令的用法如下:
     NAME
              cat - concatenate, copy, and print files
     SYNOPSIS
              cat [-benrstuv] file ...
    Options
          cat recognizes the following options:
               -b   Omit line numbers from blank lines when -n option is
                    specified. If this option is specified, the -n option is
                    automatically selected.

               -e   Print a $ character at the end of each line (prior to the
                    new-line).  If this option is specified, the -v option is
                    automatically selected.

               -n   Display output lines preceded by line numbers, numbered
                    sequentially from 1.

               -r   Replace multiple consecutive empty lines with one empty
                    line, so that there is never more than one empty line
                    between lines containing characters.

               -s   Silent option.  cat suppresses error messages about non-
                    existent files, identical input and output, and write
                    errors.  Normally, input and output files cannot have
                    identical names unless the file is a special file.

               -t   Print each tab character as ^I and form feed character as
                    ^L.  If this option is specified, the -v option is
                    automatically selected.

               -u   Do not buffer output (handle character-by-character).
                    Normally, output is buffered.

    cat -n 可以加上行号,cat -b 也可以加上行号,但会忽略空行。
    如下命令可以为file1加上空行后,输入为file2(空行也加上行号):

    cat -n file1 > file2

    如下命令可以为file1加上空行后,输入为file2(空行不加行号):

    cat -b file1 > file2
  • 相关阅读:
    require() 源码解读
    那些JS容易忽略的题
    javascript:void(0);与return false
    location.href
    IE CSS Bugs 列表和解决方法
    npm 常用命令
    移动开发不能不知道的事-meta
    Canvas介绍
    用CSS变形创建圆形导航
    一个传统行业互联网系统的架构演化(Week 4)
  • 原文地址:https://www.cnblogs.com/lance-ehf/p/4284312.html
Copyright © 2011-2022 走看看