Unix Shell Programming If Statement

']['HeBroken · 12-06-2004, 10:23 AM

ok i think i have the concept down on the programming language i just made a quick little proggie that will help me understand this a little better

Code:

print  -n "\n enter a b or c "
read char


      if (char = [aA] ) 
  char = you entered the letter A:
else
      if (char = [bB] )then
  char = you entered the letter B:
else
     if ( char =[cC] )
   char = you entered the letter C:
endif

now what am i doing wrong here? please help

secesh · 12-06-2004, 12:29 PM

what you're doing wrong:

1) not posting what language you're attempting to use
2) useing malformed syntax -- your spaceing differs in your if constraints, and you only use one "then" statement... don't get me started on your use of "char" ...

edit:
(since you say this is for shell scripting, what shell -- bash?)

wapcaplet · 12-06-2004, 03:21 PM

To say the same thing a little more politely:

It depends on what script language you are using. For 'bash', for example (the default Linux shell), 'if' statements need to be surrounded in single or double square-brackets, and also require a semicolon and 'then' statement with each 'if' and 'elif'.

I'm not sure about the use of a regular expression on the right side of the comparison; you may need to use 'expr' for that.

But then again, this all depends on your choice of language, as scripting languages can be quite different in syntax.