You should use "trap true 2" or "trap : 2" instead of "trap '' 2". That's what "help trap" in a bash shell says about it:

If ARG is the null string each SIGNAL_SPEC is ignored by the shell and by the commands it invokes.

Example:

$ cat /tmp/test
#! /bin/sh
trap : INT
cat
echo first cat killed
cat
echo second cat killed
echo done
$ /tmp/test
   <press control-C>
^Cfirst cat killed
   <press control-C>
^Csecond cat killed
done

You should use trap true 2 or trap : 2 instead of trap '' 2. That's what "help trap" in a bash shell says about it:

If ARG is the null string each SIGNAL_SPEC is ignored by the shell and by the commands it invokes.

Example:

$ cat /tmp/test
#! /bin/sh
trap : INT
cat
echo first cat killed
cat
echo second cat killed
echo done
$ /tmp/test
   <press control-C>
^Cfirst cat killed
   <press control-C>
^Csecond cat killed
done

You should use "trap true 2" instead of "trap '' 2". That's what "help trap" in a bash shell says about it:

If ARG is the null string each SIGNAL_SPEC is ignored by the shell and by the commands it invokes.

You should use "trap true 2" or "trap : 2" instead of "trap '' 2". That's what "help trap" in a bash shell says about it:

If ARG is the null string each SIGNAL_SPEC is ignored by the shell and by the commands it invokes.

Example:

$ cat /tmp/test
#! /bin/sh
trap : INT
cat
echo first cat killed
cat
echo second cat killed
echo done
$ /tmp/test
   <press control-C>
^Cfirst cat killed
   <press control-C>
^Csecond cat killed
done