KleinDocs/topics/KleinOps/operating_systems/linux/Linux.md

Linux

Operating Systems pages.
Contains Linux system management information.

___________________

Sysadmin commands

Command	Description
alias	Create an alias for Linux commands. It’s a shorthand way to customize and streamline your commands
apropos	Search man page names and descriptions.
atop	htop and top alternative
awk	A powerful pattern scanning and processing language. It’s used to manipulate data and generate
blkid	command-line utility to locate/print block device attributes.
btop	C++ version and continuation of bashtop and bpytop.
bzip2	similar to gzip. It uses a different compression algorithm.
cat	display file contents.
cd	directory navigation.
cheat	allows you to create and view interactive cheatsheets on the command line.”
chmod	change the access permissions of file system objects.
chown	change file owner and group.
chpassword	allows users to change the password for various user accounts.
chroot	run command or interactive shell with a special root directory.
clear	clears the screen of the terminal.
comm	compare Two Sorted Files Line by Line
cp	copying files and folders.
cron	set up scheduled tasks to run.
crontab	Schedule commands to run periodically at fixed times, dates, or intervals with the cron da
dd	convert and copy files.
df	display disk space usage.
diff	Compare files line by line. It’s particularly useful for comparing text files such as scripts
dmesg	prints the message buffer of the kernel ring.
dstat	view processes, memory, paging, I/O, CPU, etc., in real-time. All-in-one for vmstat, iostat
du	estimate file space usage.
env	Run a command in a modified environment.
expr	perform Math Calculations in Shell
fdisk	manipulate the disk partition table.
find	locates files based on some user-specified criteria.
free	display memory usage.
fsck	tool for checking the consistency of a file system.
glances	htop and top alternative
grep	Search a file for a pattern of characters, then display all matching lines.
gzip	file compression and decompression.
history	used to view the previously executed commands.
htop	interactive process viewer and manager.
iostat	for storage I/O statistics.
iotop	interactive I/O viewer. Get an overview of storage r/w activity.
ip	from Iproute2, a collection of utilities for controlling TCP/IP networking and traffic control
journalctl	query the systemd journal.
kill	terminate a process.
killall	Sends a kill signal to all instances of a process by name.
last	show a listing of last logged-in users.
less	similar to the more command with additional features.
ln	Make links between files. By creating a link, you can access the linked file by more than one p
locate	search files in Linux.
ls	list directory contents.
lspci	List all PCI devices. This is particularly useful for diagnosing hardware and system problem
lsusb	List USB devices. Similar to lspci, but for USB hardware connected to the system.
man	for reading system reference manuals.
mkdir	create or make new directories.
mkfs	build a Linux file system.
more	display file contents one screen/page at a time.
mount / umount	provides access to an entire filesystem in one directory.
mv	moving files and folders.
nc	command-line networking utility. (Also, see 60 Linux Networking commands and scripts.)
ncdu	a disk utility for Unix systems.
netstat	for network statistics.
nl	add Line Numbers to a File
nmon	htop and top alternative
nohup	Run Commands in the Background.
parted	for creating and manipulating partition tables.
passwd	change a user’s password.
ps	information about the currently running processes.
pstree	display a tree of processes.
pv	monitor Data Transfer Progress
pwd	shows your current directory location.
rm	removing files and folders.
rsync	remote file transfers and syncing.
sar	collects, reports, and saves system activity information, including CPU, memory, disk, and ne
scp	securely Copy Files Using SCP, with examples.
screen	hold a session open on a remote server. (also a full-screen window manager)
sed	A stream editor used to perform basic text transformations on an input stream (a file or input
sleep	suspends program execution for a specified time.
sof	List open files and the corresponding processes. This command is invaluable for troubleshootin
ssh	secure command-line access to remote Linux systems.
sudo	execute commands with administrative privilege.
systemctl	central management tool for controlling the init system.
tac	output file contents, in reverse.
tail	used to display the tail end of a text file or piped data.
tar	an archiving utility.
timeout	auto-Kill Commands After a Set Time
tldr	Collaborative cheatsheets for console commands.
tmux	a terminal multiplexer.
top	shows an overall system view.
touch	used to update the access date and modification date of a computer file or directory.
umask	set file mode creation mask.
uname	show system information (arch, linux version)
uptime	shows system uptime and load average.
useradd	create a new user or update default new user information.
userdel	used to delete a user account and all related files.
usermod	used to modify or change any attributes of an existing user account.
vi	text editor.
vmstat	shows system memory, processes, interrupts, paging, block I/O, and CPU info.
w	show a list of currently logged-in user sessions.
wait	Suspend script execution until all jobs running in the background have been terminated.
watch	Execute a program periodically, showing output fullscreen. It’s useful for monitoring comman
whois	client for the whois directory service.
yes	auto-Answer Prompts
zip	for packaging and compressing (to archive) files.

Shortcut to pages overview