03072014

Question 0

Run a command and save the output in a file

Answer 0

the redirection (>) operator is used instead of sending the output to the screen

e.g.

ifconfig > file1.txt
cat file1.txt
sort < file1txt
sort output-file.txt

Question 1

Internal return code generated

Answer 1

echo $?

# a return of zero means success
# a non zero means error

Question 2

pipe (|) operator:

Display only the lines from route that contain the phrase eth0

Answer 2

route | grep eth0

Question 3

Build and execute command lines from standard input

And then sample locating a file and provide long list

Answer 3

xargs

locate file1.txt | xargs ls -la

Question 4

Print lines matching a pattern

Answer 4

grep, egrep, fgrep

Question 5

SENDING OUTPUT FROM ONE TERMINAL TO ANOTHER

Answer 5

1. Open two terminals
2. in one terminal run tty
3. in the other terminal run route command
4. route > /dev/pts/1
   the output will go to that terminal

Question 6

Print the file name of the terminal connected to standard input.

Answer 6

tty

Question 7

USING THE SCREEN PROGRAM

Screen is a full screen window manager that shares a physical terminal with other processess

Answer 7

1. screen -L
2. Ctrl +A the press C
3. Ctrl + A + 0
4. Ctrl + A + 3