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can we pass parameter to shell function ?

Posted on 2002-04-22
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Last Modified: 2013-12-26
I would like to create a generalized function in KSH to issue an error message.

I am having files like file1, file2,file3.....

main script start here :
==========================================

if (test $flg -eq 1) then
....
check_file
....
elseif (test $flg -eq 2) then
.....
check_file
.....
elseif (test $flg -eq 3) then
.....
check_file
.....
else
       echo "Nothing passed"

fi

echo "DONE"


called function
----------------

function check_file{
       if (test -f $file_n ) then
           echo "file : $file_n exist"
       else
           echo "file not exist"
       fi
}

My question is how to pass those files (file1, file2, file3, etc) into function "check_file" ?


Any Help ?

Thanks in advance.

0
Comment
Question by:cmurugavel
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4 Comments
 
LVL 5

Expert Comment

by:ecw
ID: 6959330

function check_file{
      if (test -f "$1" ) then
          echo "file : $1 exist"
      else
          echo "file not exist"
      fi
}

...
check_file file1
...
check_file file2
...
check_file file3
...
0
 
LVL 1

Author Comment

by:cmurugavel
ID: 6959354
How do we send the $1 from calling place?

sometime I may pass the "file" in 4th or 5th.. parameter, In this case, again I have to change $n  (n can be 1,2 ..n)
in the function definition.

In C,
-------

int var=10;

main ()
{
   fn(var)
}

fn (int a_var)
{
  if (var != 10) {
    return 1;
  eles
    return 0;
}


------------------------

I would like create a shell like above menthod. Is it possible?

 
0
 
LVL 5

Accepted Solution

by:
ecw earned 20 total points
ID: 6960780
In ksh, during the execution lifetime of a function, positional parameters are the arguments to the function, not the arguments to the script.  Bourne shell isn't as advanced, if one passes arguments to a function, these replace the global positonal parameters.  Try,

pargs()
{
  echo "pargs: first arg is $1, all args are $*"
}

pargs hello world

echo "script: first args is $1, all args are $*"

run the above under ksh, and plain old sh (not POSIX sh).

As your example is obviously not bourne shell, you can user
  check_file "$1"
if the file is the first arg to the script (or calling function), or
  check_file "$2"
if the second arg, etc.
0
 
LVL 1

Author Comment

by:cmurugavel
ID: 6962061
Yes. u r right.

I tried. It works fine in ksh.

Thanks.
0

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