Shell之文本排序命令

Shell之文本排序命令

Written by Zak Zhu

学习python风格, 优雅规范书写shell代码

参考

• RHCE培训(RH033-unit8)
• 马哥linux视频
• zenghui08/Linux sort命令的几个细节问题(https://blog.csdn.net/zenghui08/article/details/7938975)
• wajika/LC_ALL=C的含义(http://www.cnblogs.com/wajika/p/6592659.html)

wc命令

Word Count

wc -l       # line count

sort命令

Sorts text to STDOUT - original file unchanged

sort [OPTION]... [FILE]...
Options:
    -r, --reverse
    -n, --numeric-sort 
    -f, --ingnore-case
    -u, --unique                                
    -t "SEP" -k START,END  
    -o, --output

细节注意:

1. 注意sort命令这样(sort test > test)是没办法将排序好的标准输出重定向到原文件的
2. 正确的使用方法是sort test -o test

实例详解:

1. sort -t":" -k3,3 -rn passwd

   

2. sort -uf test

   

uniq命令

Note: uniq dose not detect repeated lines unless they are adjacent. You may want to sort the input first, or use sort -u without uniq !!

uniq - report or omit repeated lines

常用组合:

1. sort test | uniq -i

   

2. sort test | uniq -c