Which of the following commands is used to display the directory attributes rather than its contents?

The Octal number to be given alogn with chmod command to make a file readable, writable and executable to the owner, readable and executable to group and others is:

Which of the following is not a communication command.

Which command is used to concatenate all files beginning with the string 'emp' and followed by a non-numeric characters?

Which symbol is used to separate more than one command in the same command line?