Linux Pipeline related instructions

1. Pipeline command: line command with a "|" Indicates that the pipeline command can only handle the standard output information that is transmitted by the previous instruction, that is, the stdoutput information, and there is no direct processing power for standard error output information (stderr). The first data that is followed by each pipeline must be an instruction, and this instruction has to be able to accept Stdinput's data, such instructions can be used for pipeline instructions, for example: less,more,head,tail, etc. are acceptable stdinput Pipeline command, as for the LS, CP,MV is not a pipeline command, because LS,CP,MV does not accept data from stdin. Anyway:

1) The pipeline command will only process Standand output and will be ignored for stand error output

2) The pipeline command must be able to accept data from the previous instruction as standard input to continue processing.

2.cut-d Split character –f field–c character interval: Cut out a segment of the information, parameters:

1)-D: followed by the split character. Use with-f

2)-F: Divides a piece of information into segments based on the-D split character, and uses-F to remove the paragraph (the paragraph starts at 1).

3)-C: Remove the fixed character range in units of characters, denoted by "M-n" (contains m, not containing N).

The unit of the cut operation is the row, which can be understood as a loop that performs the specified action on each row, and eventually the dequeue data.

3.grep [-ACINV] [--color=auto]: Analyze a row of data, if there is anything I want, then the line is listed. Parameters:

1)-A: Search for data in binary files in text file mode

2)-C: Calculates the number of times the "search string" was found

3)-I: Ignores case differences, so case is considered the same

4)-N: Output line number by the way

5)-V: Reverse selection, which shows which line does not have a "search string"

6)--color=auto: You can add color display to the keywords you find.

4.sort [-fbmnrtuk] [file or stdin]: sort data, Parameters:

1)-F: Ignore case differences

2)-B: Ignores the first whitespace section

3)-M: Sort by the name of the month, such as JAN,DEC, etc.

4)-N: Use numbers to sort.

5)-R: Reverse Sort

6)-u:unique, the same data in the presence of a row

7)-T: delimiter, default Tab key to split

8)-K: which interval (filed) to sort, typically used in conjunction with-t

5.–uniq [-ic]: Show duplicate data only one, parameter

1)-I: Ignore case

2)-C: Counting

6.WC [-LWM] file or standard input: Statistics archive How many words, how many lines, how many characters, parameters:

1)-L: only travel;

2)-W: Only How many words are listed

3)-M: how many characters.

7.tee [-A] file: data is simultaneously split into files and screens. Parameters:

1) Write data to the file in append form

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Linux Pipeline related instructions