Linux Essentials four ——— Pipeline command

Pipeline command

If our data has to go through a "few formalities" before we can get the format we want then we have to use the pipe command to solve this problem

* * Pipeline commands are not the same as sequential execution commands

Let's take a look at the processing information flow for pipeline commands

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Application of Pipeline command

1.Cut

* * For selecting part of the data

-D: Specify delimiter

-F: Data segment selected after-D delimited

-C: Specifies that the numbers are split in characters to fetch the top position data,

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The main purpose of **cut is to decompose the same row of data

2.grep

* * For parsing a row of data

-A: Finding data in a text file as a binary file

-C: Calculate the number of occurrences of ' string '

-I: Ignoring case differences

-N: Output line number

-V: Reverse selection, showing the line where ' string ' was not found

--color=auto: Add a color display to the part of the keyword found

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**grep can be used for regular expressions here we don't repeat

3. Sort commands

A.sort

* * can be sorted according to different data types

numbers and text are sorted differently, so it's best to unify the language when you need to sort (lang=c)

-F: Ignore case differences

-B: Ignore the first whitespace section

-M: Sort by month name

-N: Sort with a pure number, default is text type

-R: Reverse Sort

-U: Same data appears only once

-T: delimiter, default to [tab]

-K: Sort after split interval

Eg: sorted in third column for: Delimited

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B.Uniq

* * You can use this command to delete duplicate rows after sorting is complete (only once)

-I: Ignore case differences

-C: Counting

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c.WC

* * overall data for calculating the output information

-L: List only travel

-W: Only How many words (English word)

-M: List only characters

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* * We can use CAT/ETC/PASSWD | wc-l to calculate the number of accounts in our current account file .

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do you think it's interesting? 650) this.width=650; "src=" Http://img.baidu.com/hi/jx2/j_0002.gif "alt=" J_0002.gif "/> (Continuous update ...)

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Linux Essentials four ——— Pipeline command