Command Line

Question 1

rm - v

Answer 1

rm = remove a file
-v = view the removed file(s)

Question 2

rm -r

Answer 2

rm -r removes a directory recursively

Question 3

pwd

Answer 3

present working directory (to see the directory you’re currently in)

Question 4

cp

Answer 4

cp copies files or directories. cp file1 file2 will copy file1 to file2

Question 5

mv

Answer 5

To move a file into a directory, use mv with the source file as the first argument and the destination directory as the second argument

Question 6

cat

Answer 6

cat allows us to create single or multiple files, view contain of file, concatenate files and redirect output in terminal or files.

Question 7

grep

Answer 7

grep stands for “global regular expression print”. It searches files for lines that match a pattern and returns the results. It is case sensitive.

Question 8

man

Answer 8

man command shows the manual for the specified command

man command_name
man ls

Question 9

chmod

Answer 9

chmod ugo file changes permissions of file to ugo - u is the user’s permissions, g is the group’s permissions, and o is everyone else’s permissions. The values of u, g, and o can be any number between 0 and 7.

Question 10

> >

Answer 10

> > takes the standard output of the command on the left and appends (adds) it to the file on the right. Example: cat glaciers.txt&raquo_space; rivers.txt

Question 11

<

Answer 11

< takes the standard input from the file on the right and inputs it into the program on the left. Example: cat < lakes.txt

Question 12

|

Answer 12

is a “pipe”. The | takes the standard output of the command on the left, and pipes it as standard input to the command on the right. You can think of this as “command to command” redirection. Example: cat volcanoes.txt | wc

Question 13

wc

Answer 13

word count