Does Linux support wildcard characters, regular expressions and modifiers?

What does the pwd command do?

Which of the following is the intermediate between the hardware and the shell in the Linux operating system?

Which of the following is the parent process in Linux, which further has no parent?

How can you obtain a short description of the ls command?

Which of the following vi commands is used to enter in to insert mode?

You use the SUSPEND character to suspend an already running process. Which signal does it send to the process?

What is the default maximum number of open files a user can have by default?

What command will free the page cache?

Which of the following options is true of the entry below? /dev/cdrom /cd iso9660 ro,user,noauto 0 0

Which command is used to kill a process gracefully?