Find out linux version
more /etc/*-release
How long the server is up?
uptime
How many cpus I have ?
lscpu
Last system reboot
who -b
Log off
Ctrl + d
print working directory
pwd
Change to home
cd $home
Create a directory
mkdir name
mkdir -p xx/yy/zz
Remove direcotry
rmidr name
List Directory
ls
ls -l (long format)
Deleting files
rm filename
rm -i
source/report.cpp
rm -r * -- delete all the files
Process
ps -a
kill processid
Grep
You can use the grep command to search for a specified
pattern in a file or list of files.
The pattern used by the grep command is called regular
expression, hence the strange
name of the command (Global Regular Expression Print).
$cat myfile
$grep WORK myfile
touch newfile -d
CPU usage
top
Basic File Management
cp - copy
dd -image
mv - move and rename
rm - remove
ls - list
Remote Login
ssh -l root
ssh servername
Linux Performance
rpm –ql procps-ng
rpm – redhat package manager
ql – query list
proc ps -ng (next
generation)
rpm –ql /usr/bin/top
What programs are available in user ?
rpm –ql procps-ng |
grep ‘^/usr/bin/’
Go to the process
cd /proc
Find my process
pwdx $$
Go to my process
cd /proc/$$
