can't call a shell script from within awk

[Luuk]

use the function 'system(), see man-pages..:'

       system(cmd-line)      Execute  the command cmd-line, and return the exit status.  (This may not be available on non-POSIX
                             systems.)

[jabbah]

i can execute echo from within awk like so:

echo asdf jkl asdf \
| awk ' /jkl/ { sub(/jkl/,echo "X(&)") } {print}'
asdf X(jkl) asdf

but if i want to execute another shell script

cat ~/bin/doit
#!/bin/bash
echo -n KKK

like so:

echo asdf jkl asdf \
| awk ' /jkl/ { sub(/jkl/,doit) } {print}'
asdf  asdf

it doesnt work.

at least i found that it is not a path related issue, since

echo asdf jkl asdf \
| awk ' /jkl/ { sub(/jkl/,echo "("ENVIRON["PATH"]")") } {print}'
asdf (/home/peter/bin:/opt/bin:/bin:/sbin:/usr/bin:/usr/sbin) asdf

any ideas how i can make awk execute my ~/bin/doit ?