dmesg

$ set +o noclobber
$ echo something > my.file
$ echo some more > my.file
$ set -o noclobber
$ echo something > my.file
bash: my.file: cannot overwrite existing file
$ echo some more >> my.file
$

$ echo something > my.file
$ set -o noclobber
$ echo some more >| my.file
$ cat my.file
some more
$ echo once again > my.file
bash: my.file: cannot overwrite existing file
$

#!/sbin/sh
size=0
        for i in `UNIX95= ps -e -o comm,vsz,user| grep oracle| awk '{print $2}'`
        do
                tmp=$i
                size=$(($tmp+$size))
        done
 
echo "scale=1;$size/1024"| bc -l