#!/bin/sh and #!/bin/ksh

Shell Programming and Scripting
1

Hi All,
I have a shell (#!/bin/sh) with below piece of code:

if ! [ $TP_PASS = 1 ]
then
echo Staging table ABC_INT_TAB is not present in the schema >> $OUTPUT
fi

Shell is throwning below error and continue to work even after this error
/d01/app/oracle/frmuatappl/custom_ar/1.0/bin/oasis_cash_recp_conversion_abc_prog.prog: !: not found

Now we changed this shell to ksh as:
#!/bin/ksh

if ! [ $TP_PASS = 1 ]
then
echo Staging table ABC_INT_TAB is not present in the schema >> $OUTPUT
fi

I am not getting this error now.

Help me to find out whats wrong with first shell.
(In first sh shell i think it is never going in if condition.)

Thanks

2

try

if [ $TP_PASS != 1 ]

"if" expects a program to run. "!" is not a program on your system. You could try writing a program called "!" which ran it's arg list and inverted the exit code.

3

But how does ksh and sh makes difference.
ksh is working fine with : if ! [ $TP_PASS = 1 ]
sh does not work with this.

Thanks

4

They are different shells.

Some commands are implemented inside the shell, some are external, "if", "source" "cd" are examples of such statements.

Also, some systems also link /bin/sh to either ksh or even bash rather than just an implementation of "sh"