Shell Programming and Scripting

#!/bin/bash

#JAN skipped because all files are being kept
FEB=(01 10 11 12)
MAR=(02 "${FEB[@]}")
APR=(03 "${MAR[@]}")
MAY=(01 02 03 04)
JUN=(05 "${MAY[@]}")
JUL=(06 "${JUN[@]}")
AUG=(04 05 06 07)
SEP=(08 "${AUG[@]}")
OCT=(09 "${SEP[@]}")
NOV=(07 08 09 10)
DEC=(11 "${NOV[@]}")

process_date () {
    a=$1[@]

    #assembling appropriate find command (prefix + center + suffix)
    prefix="find . -maxdepth 1 -type f -name '*_*_*.xml' "

     for month in "${!a}"; do
      center="$center! -name '*_*_"$month"_*.xml' "
     done
    
    suffix="-delete"

    findcmd="$prefix$center$suffix"

    echo; echo "$findcmd"
    echo; echo -n "Execute above command?  Y/N "; read yesno

    case "$yesno" in
        [yY]) eval "$findcmd";;
        [nN]) exit;;
           *) echo "Invalid reply."; exit;;
    esac
}

#get abbreviated month name, e.g. NOV
DATE=$(date '+%b' | tr '[:lower:]' '[:upper:]')

case "$DATE" in
        JAN)    echo "It's January!"; exit;;
          *)    process_date $DATE;;
esac

$ ls
abc_2013_11_222.xml  abc_2014_02_056.xml  abc_2014_05_569.xml  abc_2014_08_432.xml  delxml.sh
abc_2013_12_111.xml  abc_2014_03_235.xml  abc_2014_06_098.xml  abc_2014_09_345.xml
abc_2014_01_450.xml  abc_2014_04_430.xml  abc_2014_07_123.xml  abc_2014_10_121.xml
$ ./delxml.sh 

find . -maxdepth 1 -type f -name '*_*_*.xml' ! -name '*_*_07_*.xml' ! -name '*_*_08_*.xml' ! -name '*_*_09_*.xml' ! -name '*_*_10_*.xml' -delete

Execute above command?  Y/N y
$ ls
abc_2014_07_123.xml  abc_2014_08_432.xml  abc_2014_09_345.xml  abc_2014_10_121.xml  delxml.sh
$

PREFIX="something"
(10,000 lines)
SUFFIX="somethingelse"
$PREFIX $MIDDLE $SUFFIX

     set --
     for month in "${!a}"; do
        set -- "$@" -name "*_*_${month}_*.xml"
     done

     # Change the "-print" to "-delete" once you've tested that it's deleting
     # the right files.
     find . -maxdepth 1 -type f -name '*_*_*.xml' "$@" -print