Linux Commands Cheat Sheet Cheat Sheet (DRAFT) by silkgoat

cat /proc|/sys	Print the content of kernel memory
df	Display free disk space
dmesg	Print kernel and driver messages
dmidecode	Display hardware inform­ation from the BIOS
du	Estimate file/d­ire­ctory space usage
free/v­mstat	Display memory usage
lshw / lspci / lsusb	Display hardware inform­ation
strace	Trace system calls and signals of a process
sync	Synchr­onize data on disk with memory
uname	Print system inform­ation

cat	Print the content of a file
cmp	Compare two files byte by byte
diff	Compare files line by line
file	Determine file type
head	Output the first part of a file
less	Display output one screen at a time
more	Display output one screen at a time
sort	Sort text file
tail	Output the last part of a file
tee	Redirect output to multiple files
touch	Change file timest­amp­/create empty file
truncate	Shrink or extend the size of a file
which	Locate a command on $PATH (and in aliases)

getent passwd	Get user entries from NSS
id	Print real and effective user and group

env	Display current user enviro­nment variables
false	Do nothing, unsucc­ess­fully
source	Read and execute commands from filename
true	Do nothing, succes­sfully

find	Search for files in a directory hierarchy
grep	Find pattern in a file by lines
locate	Find files (in locatedb generated by updatedb)

arp	Manipulate system arp cache
dig	DNS lookup utility
ip	Manipulate network interfaces settings
mtr	Network diagno­stics
netstat	Print network statistics
ping	Send ICMP echo requests to network hosts
tcpdump	Dump network traffic

kill	Send a signal to a process
lsof	List open files
pkill	Send a signal to a process by name or other attributes
pmap	Report memory map of a process
ps	Report a snapshot of a current process
pstree	Display the process tree
watch	Execute a program period­ically and capture the output