1 #!/bin/bash
  2
  3 #
  4 #
  5 #
  6
  7 if [ -z $1 ]
  8 then
  9         echo no argument
 10         exit 2
 11 elif [ ! -e $1 ]
 12 then
 13         echo unknown argument
 14         exit 3
 15 elif [ -d $1 ]
 16 then
 17         echo it\'s a directory
 18 # at this point it must be a file, let's find out what type of file
 19 elif [ ! -f $1 ]
 20 then
 21         echo some special file
 22 elif [ -x $1 ]
 23 then
 24         echo executable file
 25 elif grep '#!/bin/bash' $1
 26 then
 27         echo it\'s a bash file that is not executable yet
 28         chmod +x $1
 29 else
 30         echo this is a non-executable file it appears
 31 fi