How can I fill the gaps and then continue this sequence? - bash

Question

The code I have looks at the last active device used in the sequence and then continues it. If there is a gap in the sequence that is not currently being used I would like to fill it. How can I build that into the code?
Script works as expected as written for next in sequence. I'm not sure where to begin with adding a feature to fill in the gaps.
Input:
bash script WABEL8499IPM 3
Script:
SRCFILE="~/Desktop/deviceinfo.csv"
LOGDIR="~/Desktop/"
LOGFILE="$LOGDIR/DeviceNames.csv"
# base name, such as "WABEL8499IPM"
device_name=$1
# quantity, such as "2"
quantityNum=$2
# the largest in sequence, such as "WABEL8499IPM108"
max_sequence_name=$(cat $SRCFILE | grep -o -e "$device_name[0-9]*" | sort --reverse | head -n 1)
# extract the last 3digit number (such as "108") from max_sequence_name
max_sequence_num=$(echo $max_sequence_name | rev | cut -c 1-3 | rev)
# create a sequence of files starting from "WABEL8499IPM101" if there is not any "WABEL8499IPM".
if [ -z "$max_sequence_name" ]; then
max_sequence_name=device_name
max_sequence_num=100
fi
# Fill In Sequence If Any Spots are Available If 101, 102, 104,
# 105, 106, 107 and 108 are used I want to output 103 (to fill in),
# 109 and 110 (to continue sequence).
# create new sequence_name
# such as ["WABEL8499IPM109", "WABEL8499IPM110"]
array_new_sequence_name=()
for i in $(seq 1 $quantityNum); do
cnum=$((max_sequence_num + i))
array_new_sequence_name+=($(echo $device_name$cnum))
done
#CODE FOR CREATING OUTPUT FILE HERE
#for fn in ${array_new_sequence_name[#]}; do touch $fn; done;
# write log
for sqn in ${array_new_sequence_name[#]};
do
echo $sqn >> $LOGFILE
done
Actual result as written:
#OUTPUT FROM WABEL8499IPM, 3
#IF WABEL8499IPM101,102,104,105 ARE USED THEN OUTPUT IS THIS:
WABEL8499IPM106
WABEL8499IPM107
WABEL8499IPM108
Desired/Expected Result:
#OUTPUT FROM WABEL8499IPM, 3
#IF WABEL8499IPM101,102,104,105 ARE USED THEN OUTPUT IS THIS:
WABEL8499IPM103
WABEL8499IPM106
WABEL8499IPM107
Basically in my current script I'm making an API call to see what is currently enrolled into an MDM and then looking at the highest number in the sequence and outputting the next number in the sequence. The goal is to fill in the sequence if there are any gaps where the sequence isn't completed.

Answer 1

This might work for you:
# create a test source file
$ cat > src_file <<-EOF
foo WABEL8499IPM102 bar WABEL8499IPM108 foo bar
WABEL8499IPM106
foo WABEL8499IPM104
foo bar
WABEL8499IPM105 WAbel8499IPM110 bar
EOF
# the actual code
$ cat script
#!/usr/bin/env bash
pre=$1
num=$2
f=src_file
s=101
((num==0)) && exit
grep -oP "$pre\K[0-9]+" "$f" | sort -n > tmp
comm -13 tmp <(seq $s $((s+num+$(wc -l < tmp)))) | awk -v n=$num -v p="$pre" '{print p $0}NR>=n{exit}'
# execute the script
$ ./script WABEL8499IPM 5
WABEL8499IPM101
WABEL8499IPM103
WABEL8499IPM107
WABEL8499IPM109
WABEL8499IPM110