upd

labs/lab2/scripts/script226.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+[ "$#" -ne 3 ] && echo "usage: $0 file h|t N" && exit 1
+file=$1
+mode=$2
+num=$3
+case "$mode" in
+  h) head -n "$num" -- "$file" 2>/dev/null ;;
+  t) tail -n "$num" -- "$file" 2>/dev/null ;;
+  *) echo "mode must be h or t" ; exit 1 ;;
+esac
+