Which option to the tee command will cause the output to be concatenated on the end of the output file instead of overwriting the existing file contents?

What does the + symbol mean in the following grep regular expression: grep ‘^d[aei]\\+d$’ /usr/share/dict/words

In the command foo < bar | foobar, which ONE of the following statements is correct?

You are writing text in vi. Now you want to save your changes and exit. Which TWO sequence of inputs will accomplish this?

In the vi editor, which of the following commands will copy the current line into the vi buffer?

What is the default action of the split command on an input file?

What is the purpose of the xargs command?

When piping the output of find to the xargs command, what option to find is useful if the filenames have spaces in them?

Which of the following commands can be used to create a new file that is 100kB in size?

Which of the following commands can be used to enable a file for paging and swapping?