Calling subscript with sh vs. ksh Post: 303008766

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Top Forums UNIX for Beginners Questions & Answers Calling subscript with sh vs. ksh Post 303008766 by derndingle on Tuesday 5th of December 2017 04:00:22 PM

12-05-2017

Registered User

Calling subscript with sh vs. ksh

I ran into an issue today that I was able to resolve, but I don't quite understand why the resolution worked. I'm wondering if anyone can help me make sense of it.

I have a "kicker" script that calls 4 subscripts on a RHEL 6.9 server. It calls the scripts in sequence checking for a 0 exit code from each before running the next.

Both the kicker script and each of the subscripts were written in kornshell and all start with #!/bin/ksh as the first line.

Code:

 #!/bin/ksh 
 sh /opt/scripts/script1.ksh
 rc=$?
 if [[ ${rc} -gt 0 ]]; then
   exit
fi
sh /opt/scripts/script2.ksh
 etc.

This worked fine and as expected when running it from the command line, but generated syntax errors from the subscripts when run via a scheduler (Control-M). The syntax errors were like the following:

Code:

 /opt/scripts/script2.ksh: line 252: [: -eq: unary operator expected
 /opt/scripts/script2.ksh: command substitution: line 288: unexpected EOF while looking for matching `''
 /opt/scripts/script2.ksh: command substitution: line 289: syntax error: unexpected end of file
 /opt/scripts/script2.ksh: command substitution: line 291: unexpected EOF while looking for matching `''
 /opt/scripts/script2.ksh: command substitution: line 292: syntax error: unexpected end of file

The errors made me suspect that it was running using the wrong shell, so I changed the kicker script to call the subscripts using "ksh /opt/scripts/script2.ksh" instead of "sh /opt/scripts/script2.ksh".

The next time the job ran, it ran successfully (both from the command line and through the job scheduler.)

So, while I'm glad my issue is fixed, I'm trying to understand why what I did fixed it.

script2.ksh has #!/bin/ksh at the top. How does that interact with invoking the script using "sh script" vs "ksh script"? Does one override the other? Am I barking up the wrong tree entirely?

Thanks!

Last edited by rbatte1; 12-06-2017 at 05:56 AM..

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LEARN ABOUT OPENSOLARIS

times

times(1)							   User Commands							  times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

	   1.	  Variable assignment lists preceding the command remain in effect when the command completes.

	   2.	  I/O redirections are processed after variable assignments.

	   3.	  Errors cause a script that contains them to abort.

	   4.	  Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a
		  variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file  name  genera-
		  tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.11							    15 Apr 1994 							  times(1)

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