Clean Up Old Archived Logs

The following script cleans up old archive logs if the log file system  reaches 90-percent capacity:
$ df -k | grep arch
Filesystem                kbytes   used     avail    capacity  Mounted on
/dev/vx/dsk/proddg/archive 71123968 30210248 40594232   43%  /u08/archive
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## clean_arch.ksh                                                    ##
#######################################################################
#!/bin/ksh
df -k | grep arch > dfk.result
archive_filesystem=`awk  -F" "  '{ print $6 }' dfk.result`
archive_capacity=`awk  -F" "  '{ print $5 }' dfk.result`

if [[ $archive_capacity > 90% ] ]
then
    echo "Filesystem ${archive_filesystem} is ${archive_capacity} filled"
    # try one of the following option depend on your need
    find $archive_filesystem -type f -mtime +2 -exec rm -r {} \;   
    tar
    rman
fi