Which symbol will be used with grep command to match the pattern pat at the beginning of a line?

A. ^pat
B. $pat
C. pat$
D. pat^


Which command is used to sort the lines of data in a file in reverse order

A. sort
B. sh
C. st
D. sort -r


Which command is used to display the top of the file?

A. cat
B. head
C. more
D. grep


Which command is used to copy all files having the string chap and any two characters after that to the progs directory?

A. cp chap?? progs
B. cp chap* progs
C. cp chap[12] /progs/*.*
D. cp chap?? /progs/*


Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?

A. chmod u+x emp[1-3]
B. chmod 777 emp*
C. chmod u+r ??? emp
D. chmod 222 emp?