misc/useless

misc/useless/output.txt

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+$ ssh -p 51197 picoplayer@saturn.picoctf.net
+The authenticity of host '[saturn.picoctf.net]:51197 ([13.59.203.175]:51197)' can't be established.
+ED25519 key fingerprint is SHA256:DiJcS90U9QussLS8HLR6l6BGJb5eCA0vRmA18IvDvw8.
+This key is not known by any other names.
+Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
+Warning: Permanently added '[saturn.picoctf.net]:51197' (ED25519) to the list of known hosts.
+picoplayer@saturn.picoctf.net's password:
+Permission denied, please try again.
+picoplayer@saturn.picoctf.net's password:
+Welcome to Ubuntu 20.04.6 LTS (GNU/Linux 6.5.0-1023-aws x86_64)
+
+ * Documentation:  https://help.ubuntu.com
+ * Management:     https://landscape.canonical.com
+ * Support:        https://ubuntu.com/advantage
+
+The programs included with the Ubuntu system are free software;
+the exact distribution terms for each program are described in the
+individual files in /usr/share/doc/*/copyright.
+
+Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
+applicable law.
+
+picoplayer@challenge:~$ ls
+useless
+picoplayer@challenge:~$ ./useless
+Read the code first
+picoplayer@challenge:~$ cat useless
+#!/bin/bash
+# Basic mathematical operations via command-line arguments
+
+if [ $# != 3 ]
+then
+  echo "Read the code first"
+else
+        if [[ "$1" == "add" ]]
+        then
+          sum=$(( $2 + $3 ))
+          echo "The Sum is: $sum"
+
+        elif [[ "$1" == "sub" ]]
+        then
+          sub=$(( $2 - $3 ))
+          echo "The Substract is: $sub"
+
+        elif [[ "$1" == "div" ]]
+        then
+          div=$(( $2 / $3 ))
+          echo "The quotient is: $div"
+
+        elif [[ "$1" == "mul" ]]
+        then
+          mul=$(( $2 * $3 ))
+          echo "The product is: $mul"
+
+        else
+          echo "Read the manual"
+
+        fi
+fi
+picoplayer@challenge:~$ man useless
+
+useless
+     useless, -- This is a simple calculator script
+
+SYNOPSIS
+     useless, [add sub mul div] number1 number2
+
+DESCRIPTION
+     Use the useless, macro to make simple calulations like addition,subtraction,
+     multiplication and division.
+
+Examples
+     ./useless add 1 2
+       This will add 1 and 2 and return 3
+
+     ./useless mul 2 3
+       This will return 6 as a product of 2 and 3
+
+     ./useless div 6 3
+       This will return 2 as a quotient of 6 and 3
+
+     ./useless sub 6 5
+       This will return 1 as a remainder of substraction of 5 from 6
+
+Authors
+     This script was designed and developed by Cylab Africa
+
+     picoCTF{us3l3ss_ch4ll3ng3_3xpl0it3d_8504}