Although I am not a Linux/Unix administrator, as a developer, sometimes I am required to do some application deployment work, sometimes I will be asked to do some system tuning work. Thus I think it is important to know some basic Linux commands.
Below are 22 very basic Linux/Unix commands. Please be reminded here Linux I mean Red hat Linux.
1. find a file
locate <file_name>
2.list files under a folder
ls -l
3.find disk space
df -h
4.task managers
top
5.deal with cron table
crontab -e
6. list cron tasks
crontab -l
7. find system information for instance find number of phisical CPU
cat /proc/cpuinfo | grep -E “physical id|cpu cores” | sed ‘N;s/\n/ /’ | sort | uniq
8.list the last 500 lines in server.log
tail -f -n 500 server.log
9. copy command
cp [OPTION]… SOURCE DEST
10. create symbolic link
ln -s [TARGET DIRECTORY OR FILE] ./[SHORTCUT]
11. change directory attributes
chmod a+rw <directory name>
12. find a specific process for instance
ps -ef|gerp java
13. create a new directory
mkdir <directory name>
14. view the content of a specific file
more <file name>
less <file name>
15. delete a file/folder
rm -rf // please be reminded no warning message will be displayed for this command.
16. create a blank file
touch <file name>
17. display network related information such as network connections, routing tables etc.,
netstat -a
18. reboot your machine
reboot
19. unmount/mount a disk
umount /dev/sdb1
mount /dev/sdb1
20. find linux system information
uname
21. find ip address
ifconfig
22. find system memory information
free -m
Clean Code Clean Life 
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Hi, as I said, I am not a Linux/Unix admin, thus I can only use some common Linux commands.
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