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 grep command can search for and list Linux files based on strings you are looking for and add the context of surrounding text.

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

Grep By Example is also available as a PDF Minibook, and a Grep playground helps you learn quickly. To understand Linux, one must understand its commercial predecessor, Unix.

根据官方报告，目前 bsd-user-4-linux 已可在 Linux 上通过 QEMU 的 BSD 用户态仿真运行 FreeBSD 程序。初步移植结果显示，其能够成功在多任务环境下执行完整构建流程，并可运行如 sd、bash、clang、find、grep、git 等常见 FreeBSD 程序。

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.

Grep and diff are command line-based text analysis tools available in all Linux and Unix distributions. Both are designed to parse documents on a line-by-line basis.

Grep and diff are command line-based text analysis tools available in all Linux and Unix distributions. Both are designed to parse documents on a line-by-line basis.