How to use pipe symbols in Linux shell

This article mainly explains "how to use pipe symbols in Linux shell". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to use pipe symbols in Linux shell.

Pipe symbol, is a very powerful function of unix, the symbol is a vertical bar: "|".

Usage: command 1 | command 2 his function is to pass the result of the first command command 1 to command 2 as input to command 2, for example:

$ls-s | sort-nr (please be careful not to copy the $symbol into it)

-s is file size,-n, numeric-sort,-r is reverse, reverse

This command lists the documents in the current directory (including size) and sends the output to the sort command as input, and the sort command sorts the output of ls in descending order.

$ls-s | sort-n

Output in order from small to large.

Of course, you can also carry out many operations, such as the following function is to remove pure numbers, and then sed will replace the vertical bar (here is not a pipe symbol) with a space, and then take out the results to sort, and then select the results to display, do not understand can view sorting and paging.

Cat filename | grep-v'^ [0-9] * $'| sed's / | / / g' | sort-nrk 8-nrk 9 | tail-n + 1 | head-n 10

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