Top Linux Commands Part 1
Contents
Top Linux Commands - Part 1
Thought I would make a list of the most useful Linux Commands used everyday.
This is not a comprehensive list by any means, but this should give you a good start on some of the common Linux commands.
1) SSH - SSH is used to connect to remote terminals
Connecting to a remote server
ssh [email protected]
or
ssh -l brian briansnelson.com
Connecting over a different port
ssh -p 2020 -l brian briansnelson.com
2) Find - As you can guess to find files on a server
Location all files owned by a specific user and use ls to show the location and permissions
find / -group <groupname> -ls
Or Find which files have been changed in the last 5 days, (hacked sites)
find $PWD -mtime -5 -ls
Or save them to a text file for later use
find $PWD -mtime -5 -ls > ~/changedin5days.txt
3) du - Find out how large files and directories are
The /var partition is almost file, find out what is using up the space
du -ha /var --max-depth=1
Our home directory is almost at quota, why?
du -ha /home/brian --max-depth=1
4) df - Find out if a partition is getting full
This one is pretty basic, but you will find yourself using this command alot,
df -h
Shows the size in human readable format
df -i
Sometimes, you reach max inodes before reaching max disk space.
df -T
Show the type of file system for each partition
5) grep - find lines within files
grep is a command you will use alot when trying to find hacked files or searching log files
Trying to debug an issue with a website and only want to see your hits
tail -f /var/log/httpd/transfer.log | grep <your ipaddress>
Or to check your traffic to the server
grep <your ipaddress> /var/log/httpd/transfer.log
I will update and create more lists of useful Linux Commands
