topic Re: scripting differences between hpux and linux in Operating System - HP-UX

scripting differences between hpux and linux

Pete Des Moulins — Thu, 23 Jul 2009 12:49:23 GMT

A simple test script:

#!/usr/ksh
set -x
DN='"cn=Directory Manager"'
echo $DN

The outcome on HP-UX is what I'm expecting:
home> ./test
+ DN="cn=Directory Manager"
+ echo "cn=Directory Manager"
"cn=Directory Manager"

The outcome on Linux however is very slightly different:

[root]# sh test
+ DN='"cn=Directory Manager"'
+ echo '"cn=Directory' 'Manager"'
"cn=Directory Manager"

Anyone know why it's sticking the single quotes around the variable? When I pass ${DN} to a command later in the script it's failing because it splits it into ""cn=Directory" and "Manager"".

Re: scripting differences between hpux and linux

Steven E. Protter — Thu, 23 Jul 2009 12:52:23 GMT

Shalom,

Different shell, minor minor variations in functionality.

http://kornshell.com/
ksh

http://www.gnu.org/software/bash/manual/bashref.html
bash

SEP

Re: scripting differences between hpux and linux

Mel Burslan — Thu, 23 Jul 2009 12:57:49 GMT

I noticed, on linux, you have run the command with

sh test

command, which in turn have used the default shell you were using at the time, more than likely bash

does it run the same way if you call the script the same way you did in hpux machine ? I.e :

./test

Variable interpretations of shells are different for different shells.

Re: scripting differences between hpux and linux

Doug O'Leary — Thu, 23 Jul 2009 13:09:41 GMT

Hey;

As posted, it's almost certainly one more little difference between ksh and bash. Bash is pretty close, but certainly not an exact copy of ksh. Check out array definition for more entertaining differences.

There are ksh rpms for linux. Depending on the distro, it may already be installed. Just switch the shell and you'll be good, I think.

Doug O'Leary

Re: scripting differences between hpux and linux

Duncan Edmonstone — Thu, 23 Jul 2009 13:18:02 GMT

as others have pointed out, by doing "sh test" you are using a different shell - use the same shell (ksh) and you will get consistent results. I presume the line "#!/usr/ksh" at the top of your script was a typo for "#!/usr/bin/ksh". Here's what I get on my HP-UX/Linux systems:

# uname -sr
HP-UX B.11.31

# cat de.sh

#!/usr/bin/ksh
set -x
DN="'cn=Directory Manager'"
echo "$DN"

# ./de.sh
+ DN='cn=Directory Manager'
+ echo 'cn=Directory Manager'
'cn=Directory Manager'

---------------------------------

# uname -or
2.6.9-42.EL GNU/Linux

# cat de.sh
#!/usr/bin/ksh
set -x
DN="'cn=Directory Manager'"
echo "$DN"

# ./de.sh
+ DN='cn=Directory Manager'
+ echo 'cn=Directory Manager'
'cn=Directory Manager'

As you can see - consistent...

HTH

Duncan

Re: scripting differences between hpux and linux

Court Campbell — Thu, 23 Jul 2009 13:19:56 GMT

Once you put this line at the top

#!/usr/ksh

That is what the script is going to run under. If you have pdksh on the linux box, then it will run under the korn shell.

Re: scripting differences between hpux and linux

James R. Ferguson — Thu, 23 Jul 2009 13:21:39 GMT

Hi Pete:

I guess I have to ask why do you care, given that the differences are only in the trace?

Using '/usr/bin/ksh' [or for that matter '/usr/bin/sh'] on an Itanium 11.23 server:

+ DN="cn=Directory Manager"
+ echo "cn=Directory Manager"
"cn=Directory Manager"

Using '/bin/bash' on an OpenSUSE 11 server:

+ DN='"cn=Directory Manager"'
+ echo '"cn=Directory' 'Manager"'
"cn=Directory Manager"

Regards!

...JRF...

Re: scripting differences between hpux and linux

Pete Des Moulins — Thu, 23 Jul 2009 13:28:13 GMT