Emergency UNIX and Linux Support

# List relevant files in the current directory
ls Daily_report_[0-9][0-9][0-9][0-9]_[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]_[0-9] |
# Feed it into the AWK programming language.
# splits each line apart $1,$2,...$NF on the _ character.
# Then puts it back together into STR, minus the _1,_2, etc on the end.
# Then stores it in T.
# Once it's read all lines, prints all unique combinations it found.
        awk -F_ '{ STR=$1; for(N=2; N<NF; N++) STR=STR"_"$N;  T[STR]=1 } END { for(K in T) print K; }' |
# Reads unique combinations from awk, like Daily_report_2222_20111115
# and puts them in the variable LINE.
# feed all files matching ${LINE}_* into cat, writing to the file $LINE.
        while read LINE
        do
                cat ${LINE}_* > $LINE
                rm -f ${LINE}_*
        done

Daily_report_[0-9][0-9][0-9][0-9]_[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]_[0-9][0-9]*