A simple Backup script Post: 302607656

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Homework and Emergencies Homework & Coursework Questions A simple Backup script Post 302607656 by Waffles on Thursday 15th of March 2012 04:25:06 AM

03-15-2012

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A simple Backup script

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

1. The problem statement, all variables and given/known data:
All I have to do is write a script that will take two arguments. The first argument is a list which will contain filenames. The second argument is a directory. Basically the idea is that this script will backup all the filenames that are listed in the file from the first argument.
I talked to my proffessor and looked at my book. Both have stated that A foreach loop is the best way to go about handling this assignment.

So far I can see that the foreach loop is only able to take in one argument. This works fine but I need to add another argument for the user to write so that the data is sent to the directory. Can I give a foreach loop more than one argument???

2. Relevant commands, code, scripts, algorithms:
#!/bin/csh

foreach filename (`cat $argv[1])
echo $filename
cat $filename
end

All this does is it takes a list of files, prints out the names of those files and then the content of each file.

3. The attempts at a solution (include all code and scripts):
I tried using the set $argv[1] = $< and set $argv[2] = $< to have the user give the arguments right away. But it didnt work. The subscript ws out of range.

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

University of Colorado at Colordo Springs
The Course is: CS209 Programming with Unix
The Proffessor is Pam Carter.

---------- Post updated at 02:21 AM ---------- Previous update was at 02:14 AM ----------

I forgot to mention that all I really need to do once I extract all the files from the filelist is use the mv or the cp command to copy or move them to the directory. It's really not that hard.

---------- Post updated at 04:25 AM ---------- Previous update was at 03:21 AM ----------

Nevermind. I figured it out.

heres the finished code:

#!/bin/csh
foreach filename (`cat $argv[1]`)
cp $filename $argv[2]
end

I didn't realize that $argv[2] can be placed anywhere in the script while still referring to the second argument. Its that whole idea of positional parameters. I was so used to coding with java and other programming languages that use order and where the placement of variables/parameters actually mattered. It took me about 5 hours to figure that out. I am mad and happy at the same time.

Waffles

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LEARN ABOUT SUNOS

continue

break(1)							   User Commands							  break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until	loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,	then  break  n	levels.  If  n	is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
	   able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
	   tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10							    17 Jul 2002 							  break(1)