MQ Ksh Shell脚本-陷阱错误

Question

I have ksh script as below.

if [ `uname` == "AIX" ]; then
    export LIBPATH_BKP_$$=$LIBPATH
    # Trap so that it will return the original library path when script exits
    trap 1 2 3 9 15 "export LIBPATH=$LIBPATH_BKP_$$; unset LIBPATH_BKP_$$"
    export LIBPATH=/usr/mqm/lib:$LIBPATH
else # All else will be either Linux or Solaris which uses LD_LIBRARY_PATH
    export LD_LIBRARY_PATH_BKP_$$=$LD_LIBRARY_PATH
    # Trap so that it will return the original library path when script exits
    trap 1 2 3 9 15 "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH_BKP_$$; unset LD_LIBRARY_PATH_BKP_$$"
    export LD_LIBRARY_PATH=/usr/mqm/lib:$LD_LIBRARY_PATH_BKP_$$
fi

when I execute it it says

tdestop.ksh[52]: trap: export LD_LIBRARY_PATH=49648; unset LD_LIBRARY_PATH_BKP_49648: bad trap

tdestop.ksh- is the script name and its telling error at line 52.

Question is what is bad trap ? what is going wrong here ? I am not an expert in this area. Sorry if the question is really novice.

Thanks, Dwija

Answer 1

The syntax is:

trap action signals...

eg

trap 'echo "I caught something"' HUP INT TERM

You have flipped the order of actions and signals, which is why ksh complains. You should instead be using:

trap "export LIBPATH=$LIBPATH_BKP_$$; unset LIBPATH_BKP_$$" 1 2 3 9 15