exported functions shell scripting
Most shells support "exported functions". For example, in the
Bourne shell, you use "export -f", and ksh is "typeset -xf". But
these are confusing:
If you define foo within your .kshrc (or whatever $ENV points
at), the function is available at the command line to any
invocation of ksh.
If you then mark it for export (typeset -xf foo), it becomes
available to scripts, but it STILL not available to scripts
beginning with #!/bin/ksh.
It is THAT part that is the source of the mind-boggling
confusion: you can obviously see that as new ksh has the function,
yet it won't work in a script that begins with #!/bin/ksh . The
script does not have the function, as can easily be seen by putting
"functions" into such a script: functions listed in /.kshrc will
not be there.
However- if you both define AND mark the function for export
within the $ENV file, it then IS available to those scripts.
echo "Hi there!"
typeset -xf foo
The reason these exported functions aren't usuaslly available to
scripts beginning with #! is because the kernel doesn't propogate
them when it execs the script. Scripts without #! are forked, and
the function would be passed.
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