Difference in Shell Scripts

rv_kumar · #1 (**permalink**) 04-26-2005

Hi,

Is anyone can help me to find out the difference in Shell Scripts between HP and Sun.

Thanks in advance,
Vijay R

bhargav · #2 (**permalink**) 04-26-2005

should not be any differences except for some of the commands.

Check your current shell in both shells if you are facing any problem.
Shells make some differnce.

dangral · #3 (**permalink**) 04-26-2005

I can tell you that in ksh there are some minor differences between Sun and HP-UX.

On Sun you will have no problem doing:

Code:

if [ -z $VAR ]

but on HP-UX you will have to put double quotes around $VAR.

Also when doing a string comparison, on Sun you can do

Code:

if [ "${ErrorOccurred}" == "Y" ]

but on HP-UX, you can't have the double equals.

There are probably more, but those are a couple I can think of off the top of my head.

Just Ice · #4 (**permalink**) 04-27-2005

Quote:

Originally Posted by dangral

I can tell you that in ksh there are some minor differences between Sun and HP-UX.

On Sun you will have no problem doing:

Code:

if [ -z $VAR ]

but on HP-UX you will have to put double quotes around $VAR.

Also when doing a string comparison, on Sun you can do

Code:

if [ "${ErrorOccurred}" == "Y" ]

but on HP-UX, you can't have the double equals.

There are probably more, but those are a couple I can think of off the top of my head.

if you stick to having double quotes around variables and using only 1 "=" sign for shell tests, you will not notice any difference on the shell scripts aside from the OS-specific external commands ... if you want a portable script that does the same thing on different platforms, have the script check for the OS and then put in the OS-specific command lines as required ...

Code:

OS=`uname`
case $OS in
SunOS)  admintool ;;
AIX)    smit ;;
*)      echo "etcetera, etcetera, etcetera..." ;;
esac

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