The ranking of the items as below are depend on your vote.Act now to being the judger!

# 1 top command Display the system summary information and a list of processes\threads currently being managed by the kernel. # 2 tar command Create Tape ARchives (TAR) and add or extract files. # 3 grep command Search text for a pattern. # 4 vim command A text editor. # 5 chmod command Change the file modes/attributes/permissions. # 6 chown command Change the file ownership. # 7 ssh command Short for Secure Shell, is a secure protocol for remote logins. # 8 find command Find files. # 9 kill command Terminate or signal processes. # 10 mount command # 11 ls command Mount ( \unmount) file systems and other remote resources. # 12 man command Display system documentation. # 13 cp command Copy files. # 14 mv command Move files. # 15 mkdir command Make directories. # 16 touch command Change file access and modification times. # 17 ifconfig command View information about the configured network interfaces . # 18 rm command Remove directory entries. # 19 sed command Stream editor. # 20 pwd command Print working directory.