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I have installed GCC compiler using

Install the build-essential command. after the installation I wrote a simple c prgm. I tried to run with following command:

gcc First.c

but I'm getting " bash: ./a.out: Permission denied " message. I don't know what to do now.

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give that program (I mean a.out) the permission to "be executed" by this command:

chmod +x ./a.out

then execute it ;-)

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Execute the command

ls -l a.out

This will show the permissions granted to the file like below.

-rw-r--r-- 1 js js 0 2011-03-27 19:45 a.out

The first set is permissions and to execute it as such you need permission 'execute' Grant the execute permission using chmod +x a.out or chmod 755 a.out

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sh ./a.out is not going to work. This is a binary, not a shell script. – Adam Byrtek Mar 27 '11 at 15:29
Thanks.. for correction Adam – Jamess Mar 27 '11 at 15:38

Looks like the executable file a.out doesn't have the execute (+x) mode set.

Run the command chmod a+x a.out to give the user the right to run the file. After that you can execute the file by running ./a.out in a terminal.

There's another way to achieve the same thing:

1) Right-click the a.out file in the file browser.

2) Select Properties from the drop-down menu

3) Open up the Permissions tab

4) Check the box Allow to execute this file as a program.

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