basicsys@mars~>echo abc
abc

basicsys@mars~>echo -n abc

abcbasicsys@mars~>echo -e "abc\ndef"
abc
def

basicsys@mars~>echo -e "abc\\def"
abc\def

basicsys@mars~>echo -E "abc\\def"
abc\def

basicsys@mars~>echo -E "abc\ndef"
abc\ndef

basicsys@mars~>echo -e "\001"

basicsys@mars~>echo -e "\002"

basicsys@mars~/lec1>cat F1
Hi
Hello
123

basicsys@mars~/lec1>cat -n F1
     1  Hi
     2  Hello
     3  123

basicsys@mars~/lec1>cat F1
Hi



Hello


123
basicsys@mars~/lec1>cat -s F1
Hi

Hello

123

basicsys@mars~/lec1>cat -s -n F
     1  Hi
     2
     3  Hello
     4
     5  123

basicsys@mars~/lec1>cat -n -s F
     1  Hi
     2
     3  Hello
     4
     5  123

basicsys@mars~/lec1>cat -ns F1
     1  Hi
     2
     3  Hello
     4
     5  123

basicsys@mars~/lec1>cat -sn F1
     1  Hi
     2
     3  Hello
     4
     5  123

basicsys@mars~/lec1>cat -n F1
     1  Hi
     2
     3
     4
     5  Hello
     6
     7
     8  123

basicsys@mars~/lec1>seq 100 >| F2

basicsys@mars~/lec1>more F2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
--More--(21%)

basicsys@mars~/lec1>cat P2
#!/bin/bash
echo abc
date
cat F1
echo -e "\002"
date

basicsys@mars~/lec1>P2
-bash: ./P2: Permission denied

basicsys@mars~/lec1>ls -l P2
-rw------- 1 basicsys basicsys 53 Nov 11 13:07 P2

basicsys@mars~/lec1>chmod u+x P2

basicsys@mars~/lec1>ls -l P2
-rwx------ 1 basicsys basicsys 53 Nov 11 13:07 P2

basicsys@mars~/lec1>chmod o+x P2

basicsys@mars~/lec1>ls -l P2
-rwx-----x 1 basicsys basicsys 53 Nov 11 13:07 P2

basicsys@mars~/lec1>chmod u-x P2

basicsys@mars~/lec1>ls -l P2
-rw------x 1 basicsys basicsys 53 Nov 11 13:07 P2

basicsys@mars~/lec1>P2
abc
Fri Nov 11 13:14:35 IST 2011
Hi



Hello


123

Fri Nov 11 13:14:35 IST 2011

-------------------------------------------------------

The followng 3 lines has to be added to the .bashrc file at 
your home directory
PS1="\u@\h\w>"
set -C
PATH=$PATH:.



after that logout and login (or do . .bashrc)

------------------------------------------------------------
Here is how to register to the course:

hizkrach@mars~/lec1>~basicsys/register
Hello you called the basic systems registeration program
You need to call it in order to be able to submit exercises.
You need to call this program just once.

Please enter your id number (9 digits): 111111111
Please enter your name (first-name and last-name): racheli hizkiyahu
You entered, id: 111111111 name: racheli hizkiyahu
OK to update your details: (y/n)? y
Your details were sent for update. It will take several days
Until your details will be updated, bye.

------------------------------------------------------

Here is how submit ex1:

shalidan@mars~>~basicsys/submit
Hello you  have called the submit program
Enter the exercise number: ex1
You can not submit exercise ex1 Bye.
shalidan@mars~>~basicsys/submit
Hello you  have called the submit program
Enter the exercise number: 1
Hello you  have called the submit ex1 program.
Note that you can submit files only once.
Do you want to continue (y/n)? y
Enter the login name of your partner (if you do not have a
then enter your login name): shalidan
Enter the login name of your partner (if you do not have a
OK to continue (y/n)? y
The files that you have to submit are :
   P1.1 P1.2 P1.3 P1.4
Your file list is: P1.1 P1.2 P1.3 P1.4
Recall that you can submit exercises just once!!!
OK to submit your files (y/n)?

------------------------------------------------