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hostname
cal
whoami
dmesg
cat /proc/cpuinfo
cat /proc/meminfo
lspci -tv
lsusb -tv
dmidecode
hdparm -i /dev/sda
hdparm -tT /dev/sda
badblocks -s /dev/sda
top
htop
mpstat 1
vmstat 1
iostat 1
tcpdump -i eth0
tcpdump -i eth0 'port 80'
lsof
lsof -u user
free -h
watch df -h
id
last
who
w
groupadd test
useradd -c "John Smith" -m john
userdel john
usermod -aG sales john
ps
ps -ef
ps -ef | grep processname
kill pid
killall processname
program &
bg
fg
fg n
ifconfig -a
ifconfig eth0
ethtool eth0
ping host
whois domain
dig domain
dig -x IP_ADDRESS
host domain
hostname -i
hostname -I
netstat -nutlp
tar cf archive.tar directory
tar xf archive.tar
tar czf archive.tar.gz directory
tar xzf archive.tar.gz
tar cjf archive.tar.bz2 directory
tar xjf archive.tar.bz2
yum search keyword
yum insptall package
yum info package
rpm -i package.rpm
yum remove package
tar zxvf sourcecode.tar.gz cd sourcecode ; ./configure make; make install
grep pattern file
grep -r pattern directory
locate name
find /home/john -name 'prefix*'
find /home -size +100M
ssh host
ssh user@host
ssh -p port user@host
scp file.txt server:/tmp
scp server:/var/www/*.html /tmp
scp -r server:/var/www /tmp
rsync -a /home /backups/
rsync -avz /home server:/backups/
df -h
df -i
fdisk -l
du -ah
du -sh
cd ..
cd
cd /etc
ls -al
pwd
rm file
rm -r directory
rm -f file
rm -rf directory
cp file1 file2
cp -r source_directory destination
mv file1 file2
ln -s /path/to/file linkname
cat file
less file
head file
tail file
tail -f file