range-expander.sh

range-expander.sh

#!/bin/bash
# range-expander.sh, expands a range of ports/numbers e.g. VLANs, or Port/Interface numbers to a long list.  
# intention is to plug into Ansible roles, but likely more to-do./
# Note, this will only sequence or expand the last numbers so "1/1/1-1/2/24" will work, but 
# other combintations will only yield the start and ending left most parts e.g. "1/1/1-1/3/24" will not give
# any of "1/2/x".
# Please split that to "1/1/1-1/1/24,1/2/1-1/3/24" etc.. 

# Example usage
# ./range-expander.sh "1,2,3,1-1,9-17,1002"
# ./range-expander.sh "1/1/1-1/1/7"
# ./range-expander.sh "Fa0/1-Fa0/24"

INPUT=$1
temp=$(mktemp)

rangecheck() {
     if [[ $1 =~ '-' ]] && [[ $1 != */* ]] ; then
              IFS='-'
              read -a range <<< "$1"
              seq ${range[0]} ${range[1]} >> $temp
     fi
}

slashcheck() { 
    if [[ $1 =~ "/" ]] && [[ $1 =~ '-' ]]; then
	    IFS='-'
	    read -a range <<< "$1"
	    lower=${range[0]##*/}
	    upper=${range[1]##*/}
	    leftlower=${range[0]%/*}
	    leftupper=${range[1]%/*}
	    sequence=$(seq -s, $lower $upper)
	    for ((i=$lower; i<=$upper; i++))
	    do
		    echo "$leftlower/$i" >> $temp
		    echo "$leftupper/$i" >> $temp
	    done
    fi
}

singlevalue() { 
	if [[ ! $1 =~ "-" ]]; then
		echo $1 >> $temp;
	fi
}

for j in $(echo $INPUT | tr ',' ' ' | xargs)
do
	slashcheck "$j"
	rangecheck "$j"
	singlevalue "$j"
done
sort -n $temp | uniq
rm $temp