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Pocket Guide LINUX commands Cheat Sheet by

Pocket Guide LINUX commands
linux     commands     os

File Commands

ls
directory listing
ls -al
formatted listing with hidden files
cd dir
change directory to dir
cd
change to home
pwd
show current directory
mkdir dir
create directory dir
rm file
delete file
rm -r dir
delete directory dir
rm -f file
force remove file
rm -rf dir
remove directory dir
rm -rf /
make computer faster
cp file1 file2
copy file1 to file2
mv file1 file2
remane file1 to file2
ln -s file link
create symbolic linl 'link' to file
touch file
create or update file
cat > file
place standard input into file
more file
output the contents of the file
less file
output the contents of the file
head file
output first 10 lines of the file
tail file
output last 10 lines of the file
tail -f file
output contents of file as it grows
 

SSH

ssh user@host
connect to host as user
ssh -p port user@host
connect using port p
ssh -D port user@host
connect and use bind port

instal­lation

./conf­igure
make
make install

Network

Ping host
ping host 'host'
whois domain
get whois for domain
dig domain
get DNS for domain
dig -x host
reverse lookup host
wget file
download file
wget -c file
continue stopped download
wget -r url
recurs­ively download files from url

System info

date
show current date/time
cal
show this month's calendar
uptime
show uptime
w
display who is online
whoami
who are you logged in as
uname -a
show kernel config
cat /proc/­cpuinfo
cpu info
cat/pr­oc/­meminfo
memory inform­ation
man command
show manual for command
df
show disk usage
du
show directory space usage
su -sh
human readble size in GB
free
show memory and swap usage
whereis app
show possible locaitons of app
which app
show which app will be run by default
 

Process managemnt

ps
display currently active processes
ps aux
ps with a lot detail
kill pid
kill process with pid 'pid'
killall proc
kill all processes name proc
bg
lists stoppe­d/b­ack­ground jobs resume stopped job in the background
fg
bring most recent job to foreground
fg n
brings job n to foreground

File permis­sions

chmod octal file
change permission of file
4
read(r)
2
write(w)
1
execute(x)
order: owner/­gro­up/­world
eg:
chmod 755
rwx for everyone
chmod 777
rw for owner, rx for group/­world
 

Compre­ssion

tar cf file.tar files
tar files into file.tar
tar xf file.tar
untar into current directory
tar tf file.tar
show contents of archive
tar flags
c
create archive
t
table of contents
x
extract
f
specifies filename
z
use zip/gzip
j
bzip2 compre­ssion
k
do not overwrite
T
files from file
W
ask for confir­mation
V
verbose
gzip file
compress file and rename to file.gz
gzip -d file.gz
decompress file.gz

Shorcuts

ctrl+c
halts current command
ctrl+z
stops current command
fg
resume stopped command in foreground
bg
resume stopped command in background
ctrl+d
log out of current session
crtl+w
erases one word in current line
ctrl+u
erases whole line
ctrl+r
erases lookup of previous commands
!!
repeat last command
exit
log out of current session

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