Shell Basics (iv) Uniq and Tee

Shell Basics (iv) Uniq and Tee

Uniq is used to repeat the row, the most common option is only one, that is,-C count counts the number of repeated rows, and writes the number of repetitions in front.

Note: Use the premise that you need to sort the files first, otherwise it won't work.

#vim aming.txt "Write"

111

222

111

333

#uniq aming.txt "Separate use of uniq, do not remove duplicate lines that are not together."

111

222

111

333

#sort aming.txt |uniq "After using sort, use Uniq"

111

222

333

#sort Aming.txt |uniq-c

2 111

1 222

1 333

Note: #sort-u 1.txt = = #sort 1.txt |uniq

Tee command, redirection and dual output are occasionally used in the actual work

followed by the file name, similar to redirect, but the specific gravity of a function, the file is written in the following file in the same time, also displayed on the screen.

Tee is commonly used for pipe characters | Behind

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This article is from the "Wu Fei" blog, please be sure to keep this source http://wutengfei.blog.51cto.com/10942117/1908073

Shell Basics (iv) Uniq and Tee