First of all, there are many questions like this on AU. Still, none of them solved my problem.

I've compiled my C source using cc test.c, and it did generate a.out file.

However when I run it I get this error -

bash: ./a.out: Permission denied

My source is not in the home directory, it is on different FAT-32 partition, so I've mounted the drive in which the code is using the following command -

$ udisks --mount /dev/sda7 --mount-options umask=022
Mounted /org/freedesktop/UDisks/devices/sda7 at /media/48E9-FD53
$ cd /media/48E9-FD53/C

Then I compile my code using cc

I've also tried gcc. But still I get the same error.

Then I did - chmod +x a.out, still the same problem. Also with(chmod 755 a.out) and chmod u+x a.out.

I've also tried compiling and executing the program using sudo.

I've also tried - sudo chown sannidhya:sannidhya a.out.

I've tried every thing that I found on AU, still couldn't get it to work.

How can I run .out file (without moving it to home directory)?

Note - I am using Ubuntu 12.04 LTS.

But a weird thing here is, even after running chmod +x a.out, on running - ls -l a.out, I get-

-rw-r--r-- 1

also when I check the properties of a.out, under Permissions tab, there are only 2 modes available Read only and Read and Write.

  • Check you mount options with e.g. calling mount from command line without any further options. I assume the no exec bit is set
    – frlan
    Apr 13, 2017 at 12:30
  • Run strace a.out and post output either here or on paste.ubuntu.com and provide link Nov 30, 2017 at 23:40

1 Answer 1


If you copy the binary off of the FAT32 filesystem and onto your native ext* filesystem, the binary should run, when given the right permissions (+x).

It is possible that a filesystem is mounted with no execution rights. So in addition to chmod, you will want to also check your filesystems' mount options.

  • I've mounted my partition using - udisks --mount /dev/sda7 --mount-options umask=022... Apr 17, 2013 at 16:20
  • Have you tried copying the binary you compiled onto a different filesytem to attempt to run it? Apr 17, 2013 at 19:01

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