Police received a 999 call about an unknown man being in possession of the weapon near Buchanan Bus Station at 10.35pm on September 24 last year.
They arrived 10 minutes later and entered nearby pub The Atholl Arms. They finally traced David Hannah outside the premises.
Cops went up to the 21-year-old with their tasers drawn and ordered him to put his hands where they could be seen.
Hannah complied and revealed a lock-back knife from his left sock.
He was arrested and taken to Cathcart police station.
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The Blantyre resident appeared in the dock in Glasgow Sheriff Court after he pleaded guilty to having the knife.
Sheriff Patricia Pryce said at the hearing: “If this young man lived in the Glasgow area, I would have sent him to the young persons’ court.
“What I am prepared to do is defer sentence for him to be on good behaviour. The report is quite positive.”
She then turned to Hannah and told him: “You are a young man who has never been involved in any bother like this. You lived a pro-social life. I never expect you to be involved with this ever again.
“This is a really serious matter, make no mistake about it. Knife crime is a very serious problem in the city and we take it very seriously.”
Sentence was deferred for six months for good behaviour.
