Bangladesh, trailing by a huge 498-run margin on first innings, struggled to 150-6 in their second knock by lunch on the fourth day at the Sher-e-Bangla stadium.
Off-spinner Dilruwan Perera grabbed three wickets as the hosts lost five batsmen in the morning session after resuming at 35-1.
Opener Shamsur Rahim was dismissed off the second ball of the day, fending at a vicious short ball from Shaminda Eranga and edging a catch to wicket-keeper Dinesh Chandimal.
The hosts reached 102 before Perera broke through by trapping Shakib Al Hasan leg-before for 25.
Mominul Haque smashed eight boundaries in a fluent 50 off 57 balls, but the assault did not last long as he became Perera's second leg-before victim.
Skipper Mushfiqur Rahim was bowled by Perera for 14 off what became the last ball of the session, leaving Nasir Hossain unbeaten on 11.
With five sessions left in the match, Sri Lanka look certain to wrap up an emphatic win and take the lead in the two-Test series.
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