File: ex12.sh

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#!/bin/bash

filename=sys.log

cat /dev/null > $filename; echo "Creating / cleaning out file."
#  Creates the file if it does not already exist,
#+ and truncates it to zero length if it does.
#  : > filename   and   > filename also work.

tail /var/log/messages > $filename  
# /var/log/messages must have world read permission for this to work.

echo "$filename contains tail end of system log."

exit 0