Shell Programming and Scripting

#!/bin/bash
var_d=$1
months=$2

sh invoke_script var_d

sh invoke_script 170101
sh invoke_script 170102
sh invoke_script 170103
.
.
.
.
sh invoke_script 171231

sh main_script 170101 12

sh main_script <date in YYMMDD> <No.of Months>

#!/bin/bash
var_d=$1
months=$2
dt=$(date -d "$1 - 12 month" +"%Y%m%d")

for i in $(months)
do
sh invoke_script $dt
done

main_script 170101 12

This means starting from 170101 need to iterate for 365 days since 12 is passed. If i pass 2 then starting from 170101 61 days i.e. 2 months

sh invoke_script 170101
sh invoke_script 170102
.
.
sh invoke_script 171231

eval echo ${1:0:2}{${1:2:2}..$((${1:2:2}+$2-1))}{${1:4:2}..31} | tr ' ' '\n' | date -f- +'invoke_script %y%m%d' 2>/dev/null
invoke_script 170101
invoke_script 170102
invoke_script 170103
invoke_script 170104
invoke_script 170105
.
.
.
invoke_script 170227
invoke_script 170228
invoke_script 170301
invoke_script 170302
.
.
.
invoke_script 171229
invoke_script 171230
invoke_script 171231

var_d=$1
months=$2

for i in {0..$months}
do
   inc_date=$(date +%y%m%d -d "$var_d + $i day")
 
done