shell scripts in UNIX

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Hi, I was just wondering if anyone could give any tips on how to create a couple of shell scripts in UNIX?

Mainly for the following functions:

command & Description

back<object> This command closes
the current open
directory, and goes
back up to the previous
directory

find<flag><string> This command searches
for a specified string
according to the flags
given:
-f searches a directory
for a file which matches
string
-s searches files in the
current directory, for
occurrences of that
string

daytopayday This command calc's
out the days remaining
in the month tip payday
- assumed to be the
last day of each month

income<no.students> This utility calc's the
revenue generated per
class by multiplying the
num of students by the
annual fee
- annual fee should be
inherited by the script

Any help would be greatly appreciated.

Sarah.

 

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Where's that Harry when you need him........

 

Doing my weekly shopping!

Looking at the original question - this looks very much like a class assignment question - few in the 'real' world would want such scripts.

If this is the case then my view is that this place doesn't exist to do other people's homework!

I'll give some pointers though:

"back" This makes no sense, as directories aren't 'open' when you are at the shell prompt - so can't be 'closed'. So either there is an environment we aren't being told about, or someone is confused. Either way 'cd' is probably going to figure somewhere there.

"find" This is going to cause confusion on a normal shell prompt, because the two real commands that will be used here are 'find' and 'grep'.

"daytopayday" will probably be using 'date'

"income" will probably depend on the shell in use - some can do arithmetic - others can't.

So how about introducing yourself and say what this is about?

Harry.

 

I agree with Harry.

 

Online I hope!

 

Hi sorry, I have been having a few problems with my uni assignment for Networking and my dad usually uses this forum and said someone may be able to give me a few pointer - not do my homework for me!

This shell i am using is korn and the back function does use the cd .. command within it - I have already figured that out i just wasn't sure how you manipulate the directory once it has been passed to the script.

It is ok if no help can be given to me as you obviously think i am cheating, I will just try and find a book or website that will help instead.

Thanks
Sarah

 

Well - just to leap in with a fairly obvious assignment and not give any background made it sound as if you wanted it written for you - hence my comments. I've seen many requests that are basicaly just that on the 'net.

On the 'back' command - there has to be something else involved - the question as written makes no sense otherwise. It says 'back up'. That could either mean up a level, where the passed 'object' would have no meaning, or that there is some other unmentioned object involved - such as a stack.

I've never used korn shell - so don't know what is incorporated in that.

Harry.

 

Ok well thanks for your help but i think i am going to have to get extra help from my lecturer as i have no idea what the object would be that needs to be passed in the back script.

Thanks very much.
sarah

 

I made the same assessment Harry did for the same reasons. If a person is around internet forums enough you see many requests for help that are nothing but requests asking someone online to do homework assignments because the poster either doesn't have a clue, or they are just too lazy to do the work. The way you worded your post looked like one of those posts. Also, the lack of information provided made it look like a clueless student wanting homework done for them.

 

I'm also not a korn shell user, but I would imagine that it has something similar to pushd and popd as that might be what your prof was asking for. http://www.faqs.org/docs/bashman/bashref_73.html

Here is an online Korn reference that will probably be of great help.

 

Thanks ffreeloader I looked at the second list you posted and it looks ok at first glance, going to study it more now.

I am a student who hasnt got a clue ha ha.

Thanks for your help tho.

Sarah

 

Plus never been on a forum before and didn;t know how to start. Probs just get a book out the library or something.

 

Learning to use the forums is like learning to use Linux: just do it till you get good at it.

 

Looking at the ksh docs seems to suggest that pushd and popd are not builtins!

Harry.

 

I learned that from the link I gave and it surprised me too as that functionality is something that even the Windows cmd prompt has, however, with a little searching in the link I gave a person can find an example that covers the same functionality.

 

Nope - to get first-class meat I go to a local 'real' butcher!

Hary.