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awk '!($2 in f2) { f2[$2]=$3; f1[$2]=$1;next} f2[$1] != $3{ print f1[$2] " & " $1 " are not matching for " $2}' myFile

Thank you for testing it for various inputs and posting the Perl version.
I could not find a working Perl 5.10 version to test it, so am unable to reproduce the bug.
However, after searching on...

I noticed a slight error in my original script.

today=$(date +%Y%m%d)
while read quarter start end
do if [ $start -ge $today ]
then
exit
fi
if [ $today -gt $end ]
then
let...

Would this come close to what you need:
for X in 20170805 20170830 20170915 20171005 20171112 20180522
do END=$(date +"%Y%m%d" -d"$X - $(date +"%d" -d$X) days")
for Q in 1 2 3 4
...

Try this function with variable "start of fiscal year" in the first argument, the quarter in the second:
QUARTER() { TMP=$(($1 %10000/100+($2 -1)*3))
printf "%d %d " $2 $((...

# GNU only
# find . -type d -mindepth 1 -maxdepth 1 -mtime +10 -print
# portable
find . -type d \! -name . -prune -mtime +10 -print | sort |
while read dir
do
n=$(
find "$dir" -type f...

Good catch, but still not complete. We also have to worry about quotes in the last field:
awk '{gsub(/^\"|\"$/, ""); gsub(/\"[|]/, "|"); gsub(/[|]\"/, "|"); gsub(/\"\"/, "\""); print}' input
sed...

Another replace is needed if first field can be quoted:

awk '{gsub(/^"/,"");gsub(/\"[|]/, "|"); gsub(/[|]\"/, "|"); gsub(/\"\"/, "\""); print}' input

sed -e 's/^"//' -e 's/"|/|/g' -e 's/|"/|/g'...

With awk:
awk '{gsub(/\"[|]/, "|"); gsub(/[|]\"/, "|"); gsub(/\"\"/, "\""); print}' input
With sed:
sed -e 's/"|/|/g' -e 's/|"/|/g' -e 's/""/"/g' input

sed 's/""|/|/g' < input > output

The skeleton of a different approach:

paste ... | while read ...; do
nohup ... &
nohup ... &
wait
done

Regards,
Alister

---------- Post updated at 07:10 PM ----------...

typeset -i counter=0
typeset prev_param
typeset curr_param

while read in
do
counter=`expr $counter + 1`
modulus=`expr $counter % 2`

if [ $modulus -eq 0 ]
...

What about this different approach?
The example below is for 4 total instances, 2 of them run simultaneously.
i=0; while((i<=4)); do while (( $(pgrep -c myscript) < 2 )); do let i++ ; nohup...

To know on which unix plateform you are, use the command
uname -a

1) Which OS do you run ?
2) So you want your script to take 2 input arguments in format YYYYMMDD, and then, for every day in between these date, it check whether it can find an existing file with...