hello, can you guys please send me the linux commands such as grep, netstat ...etc, that you use in real time. please.. thank you.
 

Here are some I use often ..
telnet, ftp, ssh, scp, transfer
Overview on command line basics - telnet, ftp, ssh, scp, transfer   
Scripting with xargs - examples
Create a Linux daemon as a service - example 1   
Linux scripting basics
Network performance utilities    UTS Linxu planning docs site

Check system info
    cat /proc/meminfo
    cat /proc/cpuinfo
    ls /proc
    which $SHELL

Linux basics
bash shell cmd list    wiki.typo3.org/Linux_cheat_sheet

Linux from Scratch    
vi search - replace examples    
Linux / Tomcat admin basics - vi     
Linux file permission management examples     Linux secure transfers basics - ftp ssh     

Show sudo commands available to current user

sudo list

List file names that have a matching text string updated in the last 3 days

find ./ -iname "*log" -mtime -3 -exec grep -il "error" {} \;  > __log_search1.txt

thank you