./myscript file

cat file
15 server 21 2013-02-28
25 server 03 2013-02-10
01 server 60 2013-02-29
02 exploitation 21 2013-02-32
19 exploit 22 2013-03-13
18 serv 13 40 2013-02-24

Fatal, $1 = 'file', Time 2 digits between 00 and 23
Fatal, $2 = '', Type server OU exploitation.
Fatal, $3 = '', Minute in two digits between 00 and 59
Fatal, $4 = '', Date not conform OR absent
15 server 21 2013-02-28
25 server 03 2013-02-10
01 server 60 2013-02-29
02 exploitation 21 2013-02-31
19 exploit 22 2013-03-13
18 serv 13 40

g1()    {
EC=0
case "$1" in
([01][0-9] | 2[0-3])
  # nothing, OK !
  ;;
(*)
  echo 'Fatal, $1 = '"'$1'"', Time 2 digits between 00 and 23' >&2
  EC=1
  ;;
esac

case "$2" in
(server|exploitation)
  # nothing, OK !
   ;;
(*)
  echo 'Fatal, $2 = '"'$2'"', Type server OU exploitation.' >&2
  EC=1
  ;;
esac
return 1

case "$3" in
([01][0-9] | [2-5][0-9])
  # nothing, OK !
  ;;
(*)
  echo 'Fatal, $3 = '"'$3'"', Minute in two digits between 00 and 59' >&2
  EC=1
  ;;
esac

case "$4" in
([1-9][0-9][0-9][0-9]-0[1-9]-0[1-9] | [1-9][0-9][0-9][0-9]-0[1-9]-1[0-9] | [1-9][0-9][0-9][0-9]-0[1-9]-2[0-9] | [1-9][0-9][0-9][0-9]-0[1-9]-3[0-1] | [1-9][0-9][0-9][0-9]-1[0-2]-0[1-9] | [1-9][0-9][0-9][0-9]-1[0-2]-1[0-9] | [1-9][0-9][0-9][0-9]-1[0-2]-2[0-9] | [1-9][0-9][0-9][0-9]-1[0-2]-3[0-1])


#([1-9][0-9][0-9][0-9]-[0{1-9} | 1{0-2}]-[0{1-9} | 1{0-9} | 2{0-9} | 3{0-1}])
  # nothing, OK !
  ;;
(*)
  echo 'Fatal, $4 = '"'$4'"', Date not conform OR absent' >&2
  EC=1
  ;;
esac
[ "$EC" ]
}
f1()  {
echo $1 $2 $3 $4
}
case $# in
        0)      echo -e "# comment1\n# comment2" > list_file
                read -p "Please fill in this list_file: "
                echo $REPLY
                ;;
        1)
                        if [ ! -f "$1" ]
                         then  > $1 && echo -e "# comment1\n# comment1" > $1
                         read -p "Please fill in this file "$1": "
                         echo $REPLY
                        else
                                if [ -f "$1" -a $(grep -v '^#' "$1" | wc -l ) -ne 0 ]
                                 then
                                        if ! g1 $1 $2 $3 $4
                                         then
                                         echo "Errors found in date/time - exiting now" >&2
                                         exit 1
                                        fi
                                 grep -v '^#' "$1" |
                                 while read arg1 arg2 arg3 arg4
                                 do f1 $arg1 $arg2 $arg3 $arg4 
                                 done
                                 else
                                 read -p "Please fill in this file $1 : "
                                 echo $REPLY
                                fi
                        fi
               ;;
        4)      echo -e "# comment1\n# comment2" > list_file
                echo $1 $2 $3 $4 >> list_file
                ;;
        5)      echo -e "# comment1\n# comment2" > $1
                f1 $2 $3 $4 $5 $6 >> "$1"
                ;;
 *)      echo "error msg"; exit
esac