6.计算匹配项的数目 这个功能类似于将grep输出的结果用管道传送给计数器（wc程序），grep内建的选项可以达到同样的目的： $ sudo ifconfig | grep -c inet6 7.按给定字符串搜索文件中匹配的行号 当你在编译出错时需要调试时，grep命令的-n选项是个非常有用的功能。

grep更适合单纯的查找或匹配文本，sed更适合编辑匹配到的文本，awk更适合格式化文本，对文本进行较复杂格式处理。 1、grep 1.1 什么是grep和egrep Linux 系统中grep命令是一种强大的文本搜索工具，它能使用正则表达式搜索文本，并把匹配的行打印出来（匹配到的标红）。

The everlastingly useful grep command can change its character with the flip of a switch to help you find things.

After jumping into the Ubuntu command line yesterday, today I decided to dive a little deeper and explore the 'man' and 'grep' commands more closely.

5 Linux commands to use for quickly viewing the content of files From code and notes to configuration files (and everything in between), I have to view the content files regularly.

Have a grep question. I know I can grep a text file with -c and get how many times a particular string of text exists. But how can you take an existing text file like this: test.txt ...

If you've been a Linix/UNIX user for a long time you surely know what RTFM means (Read The *bleep* Manual). I'd like to offer up a new, related acronym, RRTFM, for Re-Read The *bleep* Manual. My first ...