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Full Discussion: awk - Why can't value of awk variables be passed to external functions ?
Top Forums Shell Programming and Scripting awk - Why can't value of awk variables be passed to external functions ? Post 302926243 by sreyan32 on Saturday 22nd of November 2014 07:03:11 AM
Old 11-22-2014
awk - Why can't value of awk variables be passed to external functions ?
I wrote a very simple script to understand how to call user-defined functions from within awk after reading this post.

Code:
function my_func_local {
echo "In func $1"
}

export -f my_func_local

echo $1 | awk -F"/" '{for (k=1;k<=NF;k++) {
if ($k == "a" ) {
system("my_local_func $k")
}
else{
print $k
}
}                        
}

I am running with the arguments-:
sh script.sh a/b/c/d/e
The expected output should be-:
Code:
In func a
b
c
d
e

But what I am getting is-:
Code:
In func
b
c
d
e

The value of k is not being passed into the external function when I am calling it from awk. Why is this happening ? How do you rectify this ? I need the function to be called within awk because what I am trying to do is take the input of a path from the user and recursively create the directories as I go.

How do I convert the value from $k to its actual value and pass it as a parameter ?
 

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LEARN ABOUT POSIX

urlcoding

URLCODING(3)						 libbash urlcoding Library Manual					      URLCODING(3)

NAME

     urlcoding -- a Libbash library for encoding and decoding URL's.

SYNOPSIS

     urlEncodeString [-l] <STRING>
     urlEncodeFile [-l] <FILE>
     urlEncodeStream [-l]
     urlDecodeString <STRING>
     urlDecodeFile <FILENAME>
     urlDecodeStream

DESCRIPTION

     urlcoding is a collection of functions that convert ASCII-text to standard URL's and vice-versa. The AWK code used is based on code by Heiner
     Steven <heiner.steven@odn.de>

     The function list:
	   urlEncodeString  Creates a URL from an ASCII string
	   urlEncodeFile    Converts a file into URL-valid text
	   urlEncodeStream  Converts standard input into URL-valid text
	   urlDecodeString  Converts a URL-encoded text back to a plain-text form
	   urlDecodeFile    Coverts URL-encoded text in a file back to plain text
	   urlDecodeStream  Converts URL-encoded standard input to text

     Detailed interface description follows.

     The [-l] option for the encoding functions should be used when line-feed characters ('
') are to be encoded as well.

     All functions print the results of their conversions to standard output.

     The exit status of all functions is that of the command 'awk', with '0' for success

FUNCTIONS DESCRIPTIONS

   urlEncodeString [-l] <STRING>
     Converts STRING - a string of ASCII characters - to URL.

   urlEncodeFile [-l] <FILE>
     Coverts FILE of URL-encoded text to plain text

   urlEncodeStream [-l]
     Converts text from standard input to URL-text.

   urlDecodeString <STRING>
     Converts URL-encoded string STRING back to text.

   urlDecodeFile <FILENAME>
     Converts the URL-encoded text in FILE to plain text.

   urlDecodeStream
     Converts the URL-encoded text from standard input to plain-text

AUTHORS

     Alon Keren <alon.keren@gmail.com>

SEE ALSO

     ldbash(1), libbash(1)

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