Install Thin web server Install Xfce VNC remote desktop on CentOS 7 How to install LetsEncrypt SSL on Bitnami WordPress Server Install Elasticsearch with Docker Install MySQL 8 on FreeBSD How to Install Xfce and VNC on Ubuntu 20.04 How to install ImunifyAV+ How to install development tools on Debian/Ubuntu Install Nginx ModSecurity on CentOS […]
How to find CPU of a Linux Server
To find CPU used on a Linux system, run command
|
1 |
cat /proc/cpuinfo |
Example
|
1 2 3 4 5 6 |
boby@sok-01:~$ cat /proc/cpuinfo | grep -i "model name" model name : AMD Ryzen 3 2200G with Radeon Vega Graphics model name : AMD Ryzen 3 2200G with Radeon Vega Graphics model name : AMD Ryzen 3 2200G with Radeon Vega Graphics model name : AMD Ryzen 3 2200G with Radeon Vega Graphics boby@sok-01:~$ |
[…]
Linux Run Command as another user
To run command as another user on Linux, you can use
|
1 |
su USER_NAME_HERE -s /bin/bash -c COMMAND_HERE |
Or
|
1 |
sudo -u USER_NAME_HERE COMMAND_HERE |
Or
|
1 |
runuser -l USER_NAME_HERE -c 'COMMAND_HERE' |
See sudo […]
ls
ls command is used to list files in linux. It is same as dir on windows. ls -la List all files in long format (l), a is to show hidden files ls -b Show only file names ls -1 Show only file names. One file per line […]
Linux User
Lock User Account in Linux usermod […]
Server Load
Here are some useful commands to check server load. iostat shows disk IO usage. %iowait shows how much time the process waits for disk operation. This should be 0. If you are on VPS, check for %steal to see if the host server is overloaded.
|
1 |
iostat 1 10 |
Checks for processes in ‘D’ state
|
1 |
for x in `seq 1 1 30`; do ps -eo state,pid,cmd | grep "^D"; echo "-"; sleep 2; done |
Top processes […]
mycomputer
These are some software/settings i have on my computer running Ubuntu 20.04 Steam store games on different Disk GNOME Shell Extension Install TeamSpeak Client on Ubuntu Separate Google Hangout icon in Ubuntu 18.04/20.04 […]
bash: man: command not found
When running man command on a debian server, i get error
|
1 2 3 |
root@lab:~# man sftp -bash: man: command not found root@lab:~# |
This is because man-db package not installed on the server. To fix, install man-db package with
|
1 |
apt install man-db |
See Errors […]
Show git branch in terminal
When working with git, to avoid accidental commit to wrong branch, it will be better if terminal show the branch name you are currently in. To display “git branch” in terminal, edit .bashrc
|
1 |
vi ~/.bashrc |
Add following code to end of the file.
|
1 2 3 4 5 6 7 |
# Show git branch in command promt if git repo show_git_branch() { git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/' } PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\[email protected]\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]$(show_git_branch)\$ ' |
You will need to restart terminal after making changes to ~/.bashrc file […]
Find Reverse-DNS/PTR using dig, nslookup, host
Reverse-DNS/PTR is used by mail servers. It is used to map an IP address to FQDN or hostname. To find Reverse DNS record for an IP address, run
|
1 |
nslookup IP_ADDR_HERE |
In this example IP 51.38.246.115 have a Reverse DNS record ok.serverok.in Using dig You can also use dig command to find PTR record for an IP […]