No, Mike is absolutely correct. dot's meaning in this context is current
directory, and slash is just a path modifier / separator. Putting the file
in ones $PATH would solve the "problem" of having to use dot slash I've
know this forever, I do not know why I was thinking that chmod +x would
solve that "issue", because it wont.
I do recall at some point perhaps not too long ago that changing file
permissions to executable was required. But now days this does not seem to
be the case . . . I've always in the last several years use ./executable
until I put the executable into my local path . . .
On Fri, Mar 25, 2016 at 2:19 PM, Mike <bellyac...@gmail.com> wrote:
> On 03/25/2016 02:03 PM, William Hermans wrote:
>
> No chmod needed *IF* you precede the command with a dot slash "./". So
> when you run a regular Linux command do you have to type this dot slash ?
> No because chmod +x is run on the executable at some point . . .
>
> So be nice to fellow group users who actually know what they're talking
> about, and have been on this list a lot longer than you.
>
> Maybe we need to learn what ./ does... It has absolutely nothing to do
> with a files permissions or whether it's executable or not. It's use is
> regarding the lack of the current directory "." in one's PATH variable.
> Umask is (largely) what controls what permissions a file is created with.
>
> mike@pride-n-joy:~/test.d$ ls -al
> total 12
> drwxr-xr-x 2 mike mike 4096 Mar 25 17:07 .
> drwxr-xr-x 37 mike mike 4096 Mar 25 16:46 ..
> -rw-r--r-- 1 mike mike 78 Mar 25 16:47 hello.c
> mike@pride-n-joy:~/test.d$ umask
> 0022
> mike@pride-n-joy:~/test.d$ gcc -Wall -o hello hello.c
> mike@pride-n-joy:~/test.d$ ls -l
> total 12
> -rwxr-xr-x 1 mike mike 6696 Mar 25 17:08 hello
> -rw-r--r-- 1 mike mike 78 Mar 25 16:47 hello.c
> mike@pride-n-joy:~/test.d$ hello
> bash: hello: command not found
> mike@pride-n-joy:~/test.d$ ./hello
> Hello, world!
> mike@pride-n-joy:~/test.d$ umask 0137
> mike@pride-n-joy:~/test.d$ gcc -Wall -o hello hello.c
> mike@pride-n-joy:~/test.d$ ls -l
> total 12
> -rw-r----- 1 mike mike 6696 Mar 25 17:09 hello
> -rw-r--r-- 1 mike mike 78 Mar 25 16:47 hello.c
> mike@pride-n-joy:~/test.d$ hello
> bash: hello: command not found
> mike@pride-n-joy:~/test.d$ ./hello
> bash: ./hello: Permission denied
> mike@pride-n-joy:~/test.d$ ls -l
> total 12
> -rw-r----- 1 mike mike 6696 Mar 25 17:09 hello
> -rw-r--r-- 1 mike mike 78 Mar 25 16:47 hello.c
> mike@pride-n-joy:~/test.d$ chmod 0750 hello
> mike@pride-n-joy:~/test.d$ ls -l
> total 12
> -rwxr-x--- 1 mike mike 6696 Mar 25 17:09 hello
> -rw-r--r-- 1 mike mike 78 Mar 25 16:47 hello.c
> mike@pride-n-joy:~/test.d$ ./hello
> Hello, world!
> mike@pride-n-joy:~/test.d$ umask 022
> mike@pride-n-joy:~/test.d$ umask
> 0022
> mike@pride-n-joy:~/test.d$
>
> Mike
>
>
> On Fri, Mar 25, 2016 at 8:53 AM, Dieter Wirz <didi.w...@gmail.com> wrote:
>
>> On Fri, Mar 25, 2016 at 3:57 PM, Graham Haddock <gra...@flexradio.com>
>> wrote:
>> > Yes.
>> > sudo chmod 755 myprogram
>> > or
>> > sudo chmod 755 myprogram.o
>> >
>> Graham, please do not tell fairy tails on this list!
>>
>> $ echo '#include <stdio.h>' > hello.c
>> $ echo 'int main (void) { printf ("Hello, world!\n"); return 0; }' >>
>> hello.c
>> $ cat hello.c
>> #include <stdio.h>
>> int main (void) { printf ("Hello, world!\n"); return 0; }
>> $ gcc -Wall -o hello hello.c
>> $ ./hello
>> Hello, world!
>> $ ls -l
>> total 12
>> -rwxrwxr-x 1 dw dw 7332 Mar 25 16:32 hello
>> -rw-rw-r-- 1 dw dw 80 Mar 25 16:31 hello.c
>> $
>>
>> No chmod needed, no myprogram.o there, why the sudo????
>>
>
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