Unix Commands
File commands
>>==> append redirection symbol.cat file1 >> file2==> append file1 to file2
Useful commands
cat /etc/os-release==> check OS version
Manual commands
full manual of a commands:
man firewall-cmdshort list of commands:
firewall-cmd -h | less
Network commands
find port on Listen state:
$ netstat -tulpn | grep LISTENping port:
telnet localhost 2128TELNET is a program that connects you to another computer so you can remotely control it via the command line. The other computer has to allow it, and you need a username and password on that computer or it won't work. NETSTAT is a way to find out basic information about a computer's networking information from the command line - for example it will tell you the computer's hostname and IP address. It's really handy for TELNET. For example, suppose I want to copy a bunch of files between two computers but I don't know anything else about them. I run NETSTAT on one to find out its IP address. Then I run TELNET on the other one and connect it to that other computer's IP address, then use the command line to copy the files.
nslookup -type=AAAA auth.docker.ionslookup -type=A auth.dockernmcli connection showornmcli c s==> network manager cli show all the active connection in green. videonmcli device statusshows all the devices status including the unmanaged
Create a script for opening files and project from the command line
/usr/local/bin/idea
Grep
grep -- -P
Parsing outputs
You can access the console output via the proc filesystem:
tail -f /proc/<pid>/fd/1where1= stdout,2= stderr
Find and remove folders is:
find . -name "FILE-TO-FIND" -exec rm -rf {} \;
Locate files
Search Results Featured snippet from the web 'locate' and 'updatedb' are the front runners in searching for the existence of any file on a Linux system. In order to operate efficiently, 'locate' uses a database rather than hunting individual directory paths. For this to operate, and remain current, it means the database itself must be updated.
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