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Thank u very much!
these is an other problem for me,
I don't know the method of gensub' means

How can I printout the result with format "###,###,###"

how can i group by same columns by another columns in Bash

Eq. this is a csv file
Co1 Co2 Co3 Co4
A A 1,000 1,000
A B 2,000 1,250
A A 2,000 3,002
A C ...

rajendar2020 thank you.
I try it(date -d "-1 month -$(($(date +%d)-1)) days"),
but it don't work.and those messages was responsed.
date: illegal option -- d
date: illegal option -- 1
date:...

I mean the second work day .the day except the saturday and sunday and except the public holiday.
for example, the Apr of this year .the first day of Apr is friday,the second day is saturday,the...

how can i get the first day of the pre month in Bash

I want to decide is that today is larger than the second business day of this month,
who can i find second business day of this month?