UNIX

•ps -Af : To get process information;
• ulimit -a : Find out user limits
•set | egrep '^(LANG|LC_)' :Find out current Language
•df -h : Find out disk space usage
•du -h : Find/Estimate file space usage
•uname: Print system information uname -s : OS Name
•useradd: Create new user account
•usermod: Modify user account
•users: List users currently logged in (•who)
•vdir: Verbosely list directory contents (ls -l -b)
•whoami: Print the current user id and name (`id -un')