added comments

.local/bin/delete_certain_known_hosts

@@ -1,10 +1,14 @@
 #!/bin/bash
 # Deletes certain lines of ~/.ssh/known_hosts
+
+# Check if any args passed
 if [ $# -eq 0 ]; then
     echo "Usage: ./delete_certain_known_hosts 3 5 7 23"
     echo "Will catch duplicate line numbers"
     exit 1
 fi
+
+# Set loop variables
 known_hosts_path=~/.ssh/known_hosts
 lines_in_known_hosts=$(wc -l "$known_hosts_path" | awk '{print $1}')
 IFS=' '
@@ -18,6 +22,8 @@ else
 	lines_to_delete+="${var}d;"
 fi
 done
+
+# Output information to user about what happened
 if [[ -z "$lines_to_delete" ]]; then
   echo "All arguments passed were invalid lines in $known_hosts_path"
 elif [[ -n "$string" ]]; then