Homework & Coursework Questions

1. The problem statement, all variables and given/known data:


Description



Bsafe The command creates a backup directory of each month at the command line (arguments of the script). The names of directories to copy will always be specified for the home user. To save copies of the script uses a specific directory, now called the backup directory. If the backup directory does not exist, the script should create it. Within the backup directory, the script should create a directory for each backup done (use a different name every time). Within this directory (the copy of the instant), each directory passed as argument of the script should be copied, including sub-directories and files, preserving dates and times of access and modification of them. Of course, the backup directory should not be copied into itself.

2. Relevant commands, code, scripts, algorithms:



3. The attempts at a solution (include all code and scripts):

Code:

#!/bin/bash
DIR=base/path/of/your/backup/dir/$(date +%y%m)
[ -d "$DIR" ] || mkdir "$DIR"
for D in $@ # gets the arguments of the command line
do
    cp -av ~/"$D" "$DIR/$D"
done

the command, need create a backup file/directory if not exist at /home, and inside of that directory, each copy safe(the command), create a subdirectory inside of backup, example: backup1, backup2...((each directory passed as argument of the script should be copied, including sub-directories and files, preserving dates and times of access and modification of them)).


4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
University of leiria, Isla, leiria, Portugal, Unisla - Apresentação, Rosalina Pires

You are asked to write a command that does many things depending of prerequisites and arguments entered.

You cant just like that write a program unless you are very experienced... I mean by that :
You start by analysing what is being asked and how it can be achieved!
That part you say nothing, so start by giving us How you see it should be done through a pseudocode or algorithm, here we can already give you our point of vue and correct you if necessary, the programming itself is just transcribing correctly in a language the algorithm.

ok..

what i need to is create a command than will do a save copy each directory at line prompt through home... that is what i not understand, i m new in shell script, to safe the copy of directorys , the command need crete a new directory with the name backup inside of /home...

Still no analyse...

hints:
1)Your command reads arguments no?
You will need to be able to parse them and see one by one if they are directories...
if no argument are passed, I suppose you will have to display a "usage "message that you will do in all cases for all errors...
2)If we agree on what is to be copied, this part isnt the difficult one...

1) yes... ok a if condition... can you give a example, please, not the answer but a example... i need to do that today ?

2) cp... ok...
backsave.sh

---------- Post updated at 01:11 PM ---------- Previous update was at 01:04 PM ----------

how i cp the dir...

and after this.. i could do it..

if /backup=0

mkdir BACKUP /HOME..
??

If its for today.. you are a bit late my friend...

TODO

Code:

1) I need to analyse the line entered
   a) IF no argument 
           THEN Display "usage ....command with proper syntax..."
           exit  exit-value
      ELSE
          UNTIL no arguments left
          Do
              Check IF argument is a directory
                       If so is it in $HOME?
                           etc...
.
.
2)# Does backup dir exist? If not create it...
  .

3)#Within the backup directory, the script should create a directory for each backup done 
(use a different name every time).# you could use the date added to backup- for name...

.
.
etc...
..
.

Without a minimum of analyse and algorithm describing how you intend to do things I see not how you will be able to fullfill the task appointed to you..
You need to be clear in your head of how, that means each elementary task has been put in procedures and organized into an algorithm before thinking of coding where here the question is : "what will be the best command to achieve such task?" ...

#!/bin/bash
DIR=/dir/$(date +%y%m)
[ -d "$DIR" ] || mkdir "$DIR"
for D in $@ # obtem os argumentos/get the arguments
do
cp /usr/home/backup**
if backup=null then

mkdir backup

**thats possible??

u are right but i m working man too.. thanks to advance