PS1 pwdexport PS1 results ina). your primary prompt being your current directoryb). your primary and secondary prompts being the current dirc). your primary prompt being your home dird). your primary and secondary prompts being the home dire). None of the above.

It is a data structure that defines all specifications of a file like the file size ,number of lines to a file ,permissions etc.  

PATH = /bin : /usr : /yourhomeThe file /bin/calendar has the following line in itcal 10 1997The file /yourhome/calendar has the following line in itcal 5 1997If the current directory is /yourhome and calendar is executeda) The calendar for May 1997 will be printed on screenb) The calendar for Oct 1997 will be printed on screenc) The calendar for the current month( whatever it is) will be printedd) Nothing will get printed on screene) An error massage will be printed

The command grep first second third /usr/you/myfilea) prints lines containing the words first, second or third from the file /usr/you/myfileb) searches for lines containing the pattern first in the files second, third, and /usr/you/myfile and prints themc) searches the files /usr/you/myfile and third for lines containing the words first or second and prints themd) replaces the word first with the word second in the files third and /usr/you/myfilee) None of the above

b  

Latest Answer : configuration files. Example: /etc/lilo.conf, /etc/fstab , /etc/mtab , /etc/resolve.conf , /etc/profile, /etc/host.conf etc. ...