This is an old revision of the document!
- sysadmin
- Jonathan Haack
- Haack's Networking
- netcmnd@jonathanhaack.com
Welcome to my gnulinux wiki page. Tis page has simple and complex system administrationnotes to remind me when I forget something that I already learned! If you are visiting, I hope you find the page useful.
#Defaults
Change the default text editor, terminal, web browser, in Debian
exo-preferred-applications
Some systems are not kind with exo, so …
xdg-mime default caja.desktop inode/directory application/x-gnome-saved-search
Set caja or other file managers to manage desktop
gsettings set org.gnome.desktop.background show-desktop-icons false gsettings set org.nemo.desktop show-desktop-icons true
#motd
Create the following to make a message of the day that will be appended to the dynamic message of the day.
sudo nano /etc/motd
Is motd printing twice, comment out motd statis in pam setting
/etc/pam.d/sshd #session optional pam_motd.so noupdate (actually it is the line above this, leave this active)
Print motd with every shell log in …
nano ~/.bashrc
Navigate to the end of the file, and add
cat /etc/motd
#install latest firefox on debian
To install the latest firefox on Debian and make it default, do the following. The link below may not always work, so replace when updated.
sudo mkdir -p /opt/firefox sudo chown -R $USER:$USER /opt/firefox cd ~/Downloads && wget -O FirefoxSetup.tar.bz2 "https://download.mozilla.org/?product=firefox-latest&os=linux64&lang=en-US" tar xjf FirefoxSetup.tar.bz2 -C /opt/firefox/ sudo mv /usr/lib/firefox-esr/firefox-esr /usr/lib/firefox-esr/firefox-esr_orig sudo ln -s /opt/firefox/firefox/firefox /usr/lib/firefox-esr/firefox-esr
To restore firefox-esr that comes with Debian.
unlink /usr/lib/firefox-esr/firefox-esr mv /usr/lib/firefox-esr/firefox-esr_orig /usr/lib/firefox-esr/firefox-esr
#optical media ripping from command line
cdrecord -pad -dao -data blag-140k-i686.iso
#security & policy information
sudo nano /etc/pam.d/common-password
Prevent Log in - create file
/etc/nologin
#miscellaneous sysadmin easy
start or stop network manager (or other services)
systemctl <start/stop/restart> networkmanager.service /etc/init.d/network-manager <start/stop/restart>
verify dhcp client working for interface eno1
dhclient -v eno1
add subnet to interface eno1
ip address add 192.1##.1##.2/24 dev eno1
interface tool w/ eno1 example
ethtool eno1
interface with switch using screen
screen /dev/ttyUSB0/ 19200
calculate subnet automatically
subnetcalc
proxying web traffic through remote server
ssh -D <port#> <user>@<domain.com>
get block ID of drives
blkid
nmap to scan devices on lan
nmap -sP 10.##.##.0/24
find utils example
find . -iname "name"
#scripts and miscellaneous
downloading scripts and executing them; example from DO
curl -sSL https://agent.digitalocean.com/install.sh | sh
ngrok notes; private http(s) tunnels
./ngrok http 80 wget https://[ngrok tunnel]/id_rsa.pub cat ~/id_rsa.pub >> ~/.ssh/authorized_keys
query hosts on the lan
avahi-browse -tl _workstation._tcp
Debian print system configuration to stdout; use root
cat /proc/cpuinfo && lspci | grep -i vga && uname -a && lsb_release -a lsb_release -a lspci
Debian repo management
cd /etc/apt nano sources.lsit [main contrib non-free]
Uploading files to remote webservers with sftp
cd ~/Downloads sftp user@host.com:/path/to/sftp/directory/of/choice/ > put /path/to/file.txt
#Building From Source to Custom library Location
tar -xf <source_filename>
Navigate to the directory that tar unarchived the files to. Then, within that directory, execute:
./configure --prefix=/usr/local make sudo make install clean
#to scrape the package name away from its version info when upgrading packages on openwrt
:1,$s/ .*//
– – –
sudo su -c "iptables -t nat -A POSTROUTING -o wlp2s0 -j MASQUERADE" sudo su -c "echo 1 > /proc/sys/net/ipv4/ip_forward"
set a static ip using ip a a x.x.x.x. dev blah
set static on wndr wan
— oemb1905 2018/05/19 14:17
