$5.$is a command in Bash shell language, when you try to set a variable, it is visitor exported to any subprocess started from that instance of bash.a$)$ Importb$)$ Exportc$)$ Opend$)$ Close$6.$ Among the following command which is used with vi editors to delete a single character?a$)$ Ab$)$ Xc$)$ Yd$)$ z$7.$ GNU stands fora$)$ Greek Needed Unixb$)$ General Unixc$)$ GNU's Not Unixd$)$ General Nobel Unixg. What is the core of the Linux operating system?a$)$ Terminal b$)$ Kemal c$)$ Command d$)$ Application$9.$ Using which of the following command can hidden files be viewed?a$)$ Ls$-$h b$)$ Ls$-$a c$)$ Ls$-$Id$)$ Ls $-$k$10.$ Linux Kernel was founded by$?$a$)$ Richard Stallman b$)$ Linus Torvalds c$)$ Bill gates d$)$ Ben Thomas$11.$ Which of the following command is used to change the working directory?a$)$ Changedb$)$ Cdc$)$ Chdr didr$12.$command is used to change the permission.a$)$ Chmod b$)$ Chperc$)$ Perd$)$ Chmode$13$command is used to display the required number of lines at the end of the files.a$)$ Head b$)$ Top c$)$ Bottomd$)$ Tail$34.$command is used to display a message on the terminal.a$)$ Msgb$)$ Message c$)$ Echod$)$ eco$15.$command is used to know the current working directorya$)$ Cwd b$)$ Wrkdir c$)$ Pidir d$)$ pwd$16.$ command is used to create a directory.a$)$ Crt dir b$)$ Mkdir c$)$ Ctdird$)$ Make dir