Linux command line pipeline

The pipe operator "|"can send the standard output of a command (stdout)to the standard input (stdin) of another command.

Filters (Filter)is the combination of multiple commands to form a pipe.

Main commands:

Sort : sorting;

Uniq, UNIQue, Output no duplicate rows of data; Parameter "-D", you can output duplicate rows;

WC, Word statistics (word count); The parameter "-L" only counts rows;

grep, output matching mode, global Regular ExpressionPrint, global regular expression printing;

As shown in figure:

Head , the first few lines of the output file, the default 10 lines; Parameter "-n", specifying the number of rows;

tail, the output file at the end of a few lines, default 10 lines; Parameter "-n", specifying the number of rows; "-F", real time (real-time) displays the end of the file information.

Tee, which reads standard input (stdin)and outputs it to standard output (stdout) or files (file) ;

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