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Try this,

 last_day=20190426
 date -d "$last_day +$( if [ `date -d $last_day +%w` == 5 ]; then echo 3; elif [ `date -d $last_day +%w` == 6 ]; then echo 2; else echo 1; fi ) days" +"%Y%m%d"

The input may be of any day. so

• if input falls on 5th(friday) day of the week will add 3.
• if input falls on 6th(saturday) day of the week will add 2.
• else add 1 for all other days of the week

Try this,

 last_day=20190426
 date -d "$last_day +$( if [ `date -d $last_day +%w` == 5 ]; then echo 3; elif [ `date -d $last_day +%w` == 6 ]; then echo 2; else echo 1; fi ) days" +"%Y%m%d"

The input may be of any day. so

• if input fall on 5th(Friday) day of the week will add 3.
• if input fall on 6th(Saturday) day of the week will add 2.
• else add 1 for all other days of the week

Try this,

 date -d "$last_day +$( if [ `date -d $last_day +%w` == 5 ]; then echo 3; elif [ `date -d $last_day +%w` == 6 ]; then echo 2; else echo 1; fi ) days" +"%Y%m%d"

The input may be of any day. so

• if input falls on 5th(friday) day of the week will add 3.
• if input falls on 6th(saturday) day of the week will add 2.
• else add 1 for all other days of the week

Try this,

 last_day=20190426
 date -d "$last_day +$( if [ `date -d $last_day +%w` == 5 ]; then echo 3; elif [ `date -d $last_day +%w` == 6 ]; then echo 2; else echo 1; fi ) days" +"%Y%m%d"

The input may be of any day. so

• if input falls on 5th(friday) day of the week will add 3.
• if input falls on 6th(saturday) day of the week will add 2.
• else add 1 for all other days of the week

Try this,

 date -d "$last_day +$( if [ `date -d $last_day +%w` == 5 ]; then echo 3; elif [ `date -d $last_day +%w` == 6 ]; then echo 2; else echo 1; fi ) days" +"%Y%m%d"

Try this,

 date -d "$last_day +$( if [ `date -d $last_day +%w` == 5 ]; then echo 3; elif [ `date -d $last_day +%w` == 6 ]; then echo 2; else echo 1; fi ) days" +"%Y%m%d"

The input may be of any day. so

• if input falls on 5th(friday) day of the week will add 3.
• if input falls on 6th(saturday) day of the week will add 2.
• else add 1 for all other days of the week