eva2000
Active Member
pushd and popd good explanation at http://www.eriwen.com/bash/pushd-and-popd/ and http://linux.101hacks.com/cd-command/dirs-pushd-popd/
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Linux VPS cheat sheet. Linux commands for CentOS/RHEL and Ubuntu/Debian
lsmod - List loaded kernal module
modprob modname - Load kernal module
I saw mention of dd tests in this thread and i would like to add some stuff to make your disk test more complete. If you run the below, simultainusly with dd you will get a per second BW and IOPS read
yum install sysstat - Installs sysstat
iostat 1 - Runs iostat a sysstat package and updates every second (tps(transactions per second) output is IOPS)
modprob modname - Load kernal module
I saw mention of dd tests in this thread and i would like to add some stuff to make your disk test more complete. If you run the below, simultainusly with dd you will get a per second BW and IOPS read
yum install sysstat - Installs sysstat
iostat 1 - Runs iostat a sysstat package and updates every second (tps(transactions per second) output is IOPS)
Find number of incoming connections to your server (It will help to find the source of DOS attack)
netstat -nut | awk '{print $5}' | cut -d : -f1| sort | uniq -c | sort -n
Find the count of every user process (Better to find cpu abusers)
ps aux | awk '{print $1}' | sort | uniq -c | sort -n | tail -5
netstat -nut | awk '{print $5}' | cut -d : -f1| sort | uniq -c | sort -n
Find the count of every user process (Better to find cpu abusers)
ps aux | awk '{print $1}' | sort | uniq -c | sort -n | tail -5
mlody.1039
New Member
Looks good for newbies 
souen
Active Member
For systems using systemd (CentOS, etc.)
systemctl [stop/start/restart/enable/disable] service
nano is cool, though vi is more likely available if you're stuck without connectivity:
vi [filename]
(i to insert/edit, Esc to exit insert mode, :wq to save file and exit)
Create or extract tarballs:
tar -cvf [filename.tgz] [directory]
tar -xvf [filename.tgz]
Handy commands for testing Internet connectivity
Test outbound connection and path:
ping -c [number of packets to send] [host]
ping6 -c [number of packets to send] [host]
traceroute -m [max hops] [host]
(use -4 or -6 to specify test on ipv4 or ipv6)
Get external IP (using curl or wget):
curl http://wgetip.com/
wget -q -O - http://wgetip.com/
(ipv4/ipv6)
curl http://whatsmyipv6.org/backend.php
See network devices
ifconfig
ip a
Show local network routes:
ip r s
(to show only routes a given device: ip r s dev [device])
Check host record (useful for rDNS, mail PTR, etc.)
dig [host]
Show processes listening on local ports:
systemctl [stop/start/restart/enable/disable] service
nano is cool, though vi is more likely available if you're stuck without connectivity:
vi [filename]
(i to insert/edit, Esc to exit insert mode, :wq to save file and exit)
Create or extract tarballs:
tar -cvf [filename.tgz] [directory]
tar -xvf [filename.tgz]
Handy commands for testing Internet connectivity
Test outbound connection and path:
ping -c [number of packets to send] [host]
ping6 -c [number of packets to send] [host]
traceroute -m [max hops] [host]
(use -4 or -6 to specify test on ipv4 or ipv6)
Get external IP (using curl or wget):
curl http://wgetip.com/
wget -q -O - http://wgetip.com/
(ipv4/ipv6)
curl http://whatsmyipv6.org/backend.php
See network devices
ifconfig
ip a
Show local network routes:
ip r s
(to show only routes a given device: ip r s dev [device])
Check host record (useful for rDNS, mail PTR, etc.)
dig [host]
Show processes listening on local ports:
Code:
netstat -lnpt
Chatahooch
New Member
Good thread thanks I'll post my cheat sheet as well pretty quick though much of it has already been covered ^^
Check Disk Performance (I/O Speed)
dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
Measuring Download Speed
wget --output-document=/dev/null http://speedtest.wdc01.softlayer.com/downloads/test500.zip
curl -o /dev/null http://speedtest.wdc01.softlayer.com/downloads/test500.zip
Full featured system information
inxi
An interactive process-viewer
htop
dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
Measuring Download Speed
wget --output-document=/dev/null http://speedtest.wdc01.softlayer.com/downloads/test500.zip
curl -o /dev/null http://speedtest.wdc01.softlayer.com/downloads/test500.zip
Full featured system information
inxi
An interactive process-viewer
htop
Great starter Guide. I am going to take this and put it into our new hire training.
Thanks for the great share and putting a ton of info in one place
Thanks for the great share and putting a ton of info in one place
crontab for those who want to schedule linux commands and here is a short description of the usage.
to open and edit crontabs
crontab format
MIN HOUR DOM MON DOW CMD
MIN - Minute Field
HOUR - Hour Field
DOM - Day Of Month
MON - Month Field
DOW - Day Of Week
CMD - Command
So for example if i want to schedule a backup on 1st June 09:10 AM
There is some fancy keywords too
to open and edit crontabs
Code:
crontab -ecrontab format
MIN HOUR DOM MON DOW CMD
MIN - Minute Field
HOUR - Hour Field
DOM - Day Of Month
MON - Month Field
DOW - Day Of Week
CMD - Command
So for example if i want to schedule a backup on 1st June 09:10 AM
Code:
10 09 01 01 * /path/to/backup/scriptThere is some fancy keywords too
Code:
@yearly cmd
Code:
@monthly cmd
Code:
@weekly cmd
Code:
@daily cmd
Code:
@hourly cmd
Code:
@reboot cmd