Standard IO pipeline 033_7 for Linux Learning

Default input is keyboard, standard output is monitor, error output is monitor

REDIRECT the standard output and error output to a file:

Command operator filename

Operators

Standard output redirect

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2>: Error output redirection

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&>: Redirect both correct and incorrect output

Both correct and error messages are imported to different files, respectively:

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The above default overrides, if added at the end of the file with >>s

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REDIRECT error output to an empty device, that is, ignore the error message

Pipeline:

The result of executing the previous command as input to the following command

Such as:

Ls-r |more: Pagination shows the results of Ls-r

LS |grep CLC: Search for files containing CLC

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By default, error messages can only be output to a file and cannot be exported to the pipeline, and the output to the pipe is 2>&1

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Sort for sorting

By default, multiple pipelines only show the last result, tee not only outputs the intermediate results to the file, but also continues the pipeline

Enter redirection:

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>>: Redirect The results of multiple entries at once

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ABC for END keyword

Loop statement:

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Create the user and set the initial password bit password:

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Create ADMIN1~10, and default password password

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Test host Connectivity:

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PING-C2 Ping Two packets, the default is to ping all the time

$ = 0 for success, 1 for failure

This article is from the "FLYCLC" blog, make sure to keep this source http://flyclc.blog.51cto.com/1385758/1540837