basicsys@mars~/lec1>echo abcd
abcd
basicsys@mars~/lec1>echo -n abcd
abcdbasicsys@mars~/lec1>echo "ab\ncd"
ab\ncd
basicsys@mars~/lec1>echo ab\ncd
abncd
basicsys@mars~/lec1>echo "abcd"
abcd
basicsys@mars~/lec1>echo "ab\"cd"
ab"cd
basicsys@mars~/lec1>echo "ab\\cd"
ab\cd
basicsys@mars~/lec1>echo "ab\cd"
ab\cd
basicsys@mars~/lec1>echo -e "ab\ncd"
ab
cd
basicsys@mars~/lec1>echo -e -n "ab\ncd"
ab
cdbasicsys@mars~/lec1>echo -n -e "ab\ncd"
ab
cdbasicsys@mars~/lec1>echo -ne "ab\ncd"
ab
cdbasicsys@mars~/lec1>echo -en "ab\ncd"
ab
cdbasicsys@mars~/lec1>echo -e "\a"

basicsys@mars~/lec1>echo -e "abc\aabcccccc\a"
abcabcccccc
basicsys@mars~/lec1>echo -e 
"abc\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a"
abc
basicsys@mars~/lec1>echo -e "\a"

basicsys@mars~/lec1>echo -e 
"abc\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a"
abc
basicsys@mars~/lec1>echo -e "\a"

basicsys@mars~/lec1>echo -e 
"abc\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a"
abc
basicsys@mars~/lec1>echo -e "\x30"
0
basicsys@mars~/lec1>echo -e "\x41"
A
basicsys@mars~/lec1>echo -e "\001"

basicsys@mars~/lec1>echo -e "\002"

basicsys@mars~/lec1>echo -e "\001\002\003\004"
basicsys@mars~/lec1>cat F1
abcd
efgh xy
1234
basicsys@mars~/lec1>ls
F1  F5                    old  P1.1  P1.3  tichon2013.txt
F2  lec1-morning2013.txt  P1   P1.2  P1.4  udi
basicsys@mars~/lec1>
basicsys@mars~/lec1>asfhskfsfka
-bash: asfhskfsfka: command not found
basicsys@mars~/lec1>cat
afsdfksflas
basicsys@mars~/lec1>cat -n F1
     1  abcd
     2  efgh xy
     3  1234
basicsys@mars~/lec1>cat F2
hello

hi


bye
basicsys@mars~/lec1>cat -n F2
     1  hello
     2
     3  hi
     4
     5
     6  bye
basicsys@mars~/lec1>cat -s F2
hello

hi

bye
basicsys@mars~/lec1>cat -sn F2
     1  hello
     2
     3  hi
     4
     5  bye
[admashac@mars ~]$ pwd
/home/cs/y11/admashac
[admashac@mars ~]$ cd lec1
[admashac@mars lec1]$ cd
[admashac@mars ~]$ pwd
/home/cs/y11/admashac
[admashac@mars ~]$ man echo
ECHO(1)                          User Commands

NAME
       echo - display a line of text

SYNOPSIS
       echo [OPTION]... [STRING]...

DESCRIPTION
       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
              output version information and exit

       If -e is in effect, the following sequences are recognized:
[admashac@mars ~]$ cat .bashrc
# .bashrc

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

# User specific aliases and functions
PS1="\u@\h\w>"
set -C
PATH=$PATH:.

admashac@mars~/lec1>ls
P2
admashac@mars~/lec1>cat P2
pwd
date
admashac@mars~/lec1>P2
-sbash: ./P2: Permission denied
admashac@mars~/lec1>chmod u+x P2
admashac@mars~/lec1>ls
P2
admashac@mars~/lec1>P2
/home/cs/y11/admashac/lec1
Tue Oct 30 19:18:52 IST 2012
basicsys@mars~/lec1>cat P3
echo hello
date
sleep 2
echo after sleeping
date
basicsys@mars~/lec1>chmod u+x P3
basicsys@mars~/lec1>P3
hello
Tue Oct 30 19:23:16 IST 2012
after sleeping
Tue Oct 30 19:23:18 IST 2012
admashac@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): 205833320
Please enter your name (first-name and last-name): shachar admati
You entered, id: 205833320 name: shachar admati
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.

Instructions to be able to run programs
---------------------------------------
Do the following just once for the whole course:

1. login to mars

2. write: pico .bashrc

3. then using copy/paste add the following 3 lines to the
   end of the file .bashrc 

PS1="\u@\h\w>"
set -C
PATH=$PATH:.

(do not add spaces in the above 3 lines!!!!)

4. exit from pico using ctrl+X and save the file

4. write: logout
5. then login again using telnet mars.netanya.ac.il

Instructions on how to run a specific program
---------------------------------------------
1. using pico create a file. for example do
   pico P2
   then write inside the file two commands, for examle
   pwd
   date
   then exit pico and save the file
2. write chmod u+x P2
3. run the program P2 by writing P2
   
Instructions on how to register to the course. 
----------------------------------------------
in order to be able to register to the course, run
the following command (just one time for the whole semester)

~basicsys/register

you can run the above command from any directory. 
then enter your id number and name and exit. 

For example after typing ~basicsys/register 
and then giving id as 11111111 and name as udi rotics 
the following was seen on the screen:

basicsys@mars~>~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): udi rotics
You entered, id: 111111111 name: udi rotics
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.

Instructions on how to submit exercises
----------------------------------------------

In exercise 1 you have to prepare 4 files, their names
are P1.1 P1.2 P1.3 P1.4

after you prepared the files and tested them, you need will
submit them for check (you have to submit all 4 files in one submit
command). To submit the files for check you write the
command ~basicsys/submit from the directory that contains the 4
files P1.1 P1.2 P1.3 P1.4

Then you will be asked for exercise number (write there 1 and
not ex1). Then you will be asked for the lonin name of your partner,
if you don't have a partner write the login name of yourself there).

Here is an example of the screens I got when I did ~basicsys/submit
from the basicsys login name

basicsys@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 partner
then enter your login name): basicsys
Your user id is: basicsys  your partner user id is: basicsys
OK to continue (y/n)? basicsys
You have to enter y or 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)?
y
Your files where submitted successfully. Bye.