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How to use catch, try and final in bash script

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# 1  
Old 04-15-2009
How to use catch, try and final in bash script
Hi Everyone,

How to use catch, try and final in bash script?
what is (SQLException e) and (IOException e), who to conver this 2 function to bash script?

Thank you
# 2  
Old 04-16-2009
Quote:
Originally Posted by ryanW
Hi Everyone,

How to use catch, try and final in bash script?
You don't. BASH is not a OO language implementing any features remotely like that.
# 3  
Old 04-16-2009
is it posibble for me to the tranditional logical? coz i just need the logical.. so that i make by my own function instead of OO function...
# 4  
Old 04-16-2009
What do you mean by "traditional logic"? Shell scripts work pretty much like any functional language, a command can either work OK or fail. If the coder has been nice it will give you some information on why it failed. $? is the variable set to the return code of a program, 0 means "good", anything else usually is bad.

Exceptions are done by
  1. Knowing which program you called last (sed probably won't produce and SQL error) and
  2. hoping that the coder used different return codes for different errors, instead of just "good" and "bad"
# 5  
Old 04-16-2009
Thank you pludi and Corona688...

Regarding "tranditional logic, means normal logical... like if else...

I think shell script can do the OO function, just wan to know how its works for the (SQLException e) and (IOException e).

thankx...
# 6  
Old 04-16-2009
Quote:
Originally Posted by ryanW
I think shell script can do the OO function, just wan to know how its works for the (SQLException e) and (IOException e).
thankx...
no OO support for shell scripts. If you want OO, use a programming language like Python (Java, Ruby, even Perl). you can then use try,catch eg, Python
Code:
import os
try :
   os.rename(oldfile,newfile) #try to rename file
except Exception,e:
   print e #print error message
else:
   # do something if pass

# 7  
Old 04-16-2009
Well, if you're really really determined, very very frustration resistant, and have a whole lot of time on your hand, it might be possible to simulate OO in shell scripts.

And again, there are no exceptions in shell scripts, only "good" or "bad" exits
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