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Top Forums Shell Programming and Scripting Core dump in a simple shell script! Post 302931859 by nsinha on Friday 16th of January 2015 04:18:36 AM
Old 01-16-2015
Core dump in a simple shell script!

Hi

I have a very simple shell script that is dumping core -

testScript -

Code:
#!/bin/ksh
PROG=${0##*/}   # basename
if [ $# -ne 1 ]; then
        print -u2 "Usage: $PROG filename"
        exit 1
fi
MDY=$(date '+%m%d%y')
if [ -f ${1}.${MDY} ]; then
        cat ${1}.out >>${1}.${MDY}
else
        cp -p ${1}.out ${1}.${MDY}
fi

Code:
gdb testScript core.11632
Core was generated by `/bin/ksh /bin/testScript /data/SREF'.
Program terminated with signal 11, Segmentation fault.
#0  0x00000000004c16e7 in ?? ()

Here we are passing another file, named /data/SREF as the only argument.

I have tested the code several times and it is working without any issue. So why it's dumping core in the customer's machine?

I read somewhere that when a shell script dumps core, then the issue should be related to the shell binary itself and not with the code. The shell binary is corrupted and we should install Linux patches to solve the problem.

Is the above statement true? Why this simple shell script is dumping core?

Thanks
 

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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 vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation 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 5.10 15 Apr 1994 times(1)
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