special caracteres linux

$? gives you the return value of the last command / function, which can include an exit statement
0==> succes
130==> terminé avec ctrl+c
1==>fail (expl ifconfig gltkgtlg,tl) :p

#!/bin/bash

# Its a test script : test.sh

echo "First Parameter : \$1 = $1"
echo "Total passed parameters : \$# = $#"
echo "All parameters : \$* = $*"
echo "Process Id  : \$$ = $$" 
exit 0