"pocket-knife" - Translation from English to Arabic

The victim was tied to a tree and tortured with a pocket-knife while being told that that was how those who betrayed the revolution were punished.
وقد صُلب إلى جزع شجرة وتعرض للتعذيب بمدية وقيل لـه أن هـذا هـو جـزاء من يخون الثورة.

I killed a man in a trifling quarrel over a pocket-knife.
قتلتُ رجلاً في شجار تافهٍ من أجل مدية جيب