Linux Command Reference

Linux is a free and open source operating system widely used on both servers and PCs. Linux commands are tools that come with this operating system to perform various tasks.

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$ldconfig

Dynamic link library management commands

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$ld

Concatenate object files into executable programs

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$lastlog

Display the latest login information of all users in the system

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$lastb

List information about users who failed to log in to the system

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$last

List information about current and past users who have logged into the system

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$killall

Kill a group of processes using their name

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$kill

Send a signal to the process.

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$kexec

Boot from the currently running kernel to a new kernel

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$kernelversion

Print the current major version number of the kernel

whois client service

A flexible and lightweight command line JSON processor

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$journalctl

Retrieving systemd logs is a tool only available in CentOS 7.