Wiki source code of Commands

Version 1.2 by Julien Fleury on 2021/01/07 00:32

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1.1	1	{{box cssClass="floatinginfobox" title="Contents"}}
	2	{{toc/}}
	3	{{/box}}
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	5	= Useful Linux commands =
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	7	Here is a list of useful commands to be executed on a Linux server (debian). Feel free to contribute by feeding this page with your own tricks and tips.
	8
	9	== Telnet like ==
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	11	It is often required to test if a host[:port] is reachable and access is granted from a server. Best way to execute a telnet like command on a Linux console is to work with special files used to communcate with peripherals. Thus, in order to test tcp port 8000 on server 10.100.100.100, simply try to write in file /dev/tcp/10.100.100.100/8000 and add a return value depending on success or failure
	12
	13	{{code language="shell"}}
	14	echo > /dev/tcp/10.100.100.100/8000 && echo 'up' \|\| echo 'down'
	15	-bash: connect: Connection refused
	16	-bash: /dev/tcp/10.100.100.100/8000: Connection refused
	17	down
	18	{{/code}}
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	20

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