(IFS=" ";id|xargs -n1)
uid=53828(701567017)
gid=10545(mkgroup-l-d)
groups=0(root),544(Administrators),545(Users),10545(mkgroup-l-d)

# !/bin/bash
clear
times=0
guess=$[$RANDOM * 40 / 32767]
try=0

echo "You have 10 tries ..... good luck! "
echo
while [ $times -ne $guess ]
do
  echo
  echo -n "Please enter a number between 1 and 40 : "
  read input
  try=$[$try+1]
  if [ $try = 10 ]
  then
    echo "You have exhausted all tries"
    echo
    exit 0
  else
    echo $input | grep "^[1-9][0-9]*$" > /dev/null 2>&1
    if [ "$?" -ne 0 ]
    then
      echo "Please only integers (1-40) "
    else
      if [ $input -eq $guess ]
      then
        echo "Congratulation "
        echo
        exit 0
      else
        if [ $input -lt $guess ]
        then
          echo "Too small "
        else
          echo "Too big "
        fi
      fi
    fi
  fi
done

#!/bin/bash

function cando
{
  echo cando
  return 0
}

cando

if [ $? -ne "0" ]; then  echo this will never happen; exit 1; fi

function candomore
{
  echo function arguments = $*
}

candomore and more and more

# !/bin/bash
clear                         #just clear for me the screen 
times=0                       #a variable to help me check  the while loop
guess=$[$RANDOM * 40 / 32767] #my randomly generated number to  be guessed
try=0                         #this will set my counter to count number of guesses  

echo "You have 10 tries ..... good luck! "
echo
while [ $times -ne $guess ]   #while true; as long as everything is ok
do
  echo
  echo -n "Please enter a number between 1 and 40 : "
  read input
  try=$[$try+1]               #start counting number og guesses
  if [ $try = 10 ]            #if the guess was the tenth, then.....
  then
    echo "You have exhausted all tries"
    echo
    exit 0
  else
    echo $input | grep "^[1-9][0-9]*$" > /dev/null 2>&1 #check to see that only integers a used
    if [ "$?" -ne 0 ]         #if my special variable $? stored a value other than 0, it means a letter or #another character or combination of letters and characters were used. So tell the user to use 1-40       
    then
      echo "Please only integers (1-40) "
    else
      if [ $input -eq $guess ]#if the user used a number equal to that which was randomly generated
      then
        echo "Congratulation " #then the user has won
        echo
        exit 0
      else
        if [ $input -lt $guess ]#else the user used a smaller number
        then
          echo "Too small "
        else
          echo "Too big " #or the user used a greater number than the one needed
        fi
      fi
    fi
  fi
done

      if [ $input -eq $guess ] #if the user used a number equal to that which was randomly generated
      then
      [ $try -eq 10 ] && echo "And on the very last guess......."
        echo "Congratulation " #then the user has won
        echo
        exit 0
      else

if [ $try -eq 10 ]
then
  echo "And on the very last guess......."
fi

#just setting my variable returnchar to store the return key
retunchar=$'\r'
     echo $eingabe | grep "[1-9][0-9]*" > /dev/null 2>&1
	if [ "$?" -ne 0 ]
           then
               #here is where I get error "integer expression expected"
               ["$?" -eq $returnchar ] && echo "you didn't type anything(you only pressed the return key"
		echo " use only numbers please "
        fi

     #If the input is not a number this will return the empty string
     #If it is a number it will return the number
     raffiniert=$(echo $eingabe | grep '^[1-9][0-9]*$')
        # -z and -n test for empty and non-empty strings respectively
	if [ -z "$raffiniert" ]
           then
		echo " enter a number please "
        else
        # ... code as before
        fi

$ foo=""

$ [ -z $foo ] && echo "foo is not set ($foo)"
foo is not set ()

$ foo="bar"

$ [ -z $foo ] && echo "foo is not set ($foo)"

$ [ -n $foo ] && echo "foo is set ($foo)"
foo is set (bar)