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This may sound silly, but I have a file/ script that need to run and in order to do it I must change it to become executable. I would want to use either chmod a+x or chmod 755. But is there a difference between using chmod a+x and chmod 755?
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When you perform chmod 755 filename command you allow everyone to read and execute the file, the owner is allowed to write to the file as well. So, there should be no permission to everyone else other than the owner to write to the file, 755 permission is required.
The number defined after chmod represents the permissions. The chmod 775 is an essential command that assigns read, write, and execute permission to a specific user, group, or others.
This added execute permission for group. $ chmod g=x test_file -rw---xr-- 1 eric users. The = operators set group's permissions to execute, and in doing so removed read and write permission. While + and - set or unset the permissions specified, = will set exactly the mode specified and remove any others.
Use chmod -R 755 /opt/lampp/htdocs if you want to change permissions of all files and directories at once. Use find /opt/lampp/htdocs -type d -exec chmod 755 {} \; if the number of files you are using is very large.
chmod a+x modifies the argument's mode while chmod 755 sets it. Try both variants on something that has full or no permissions and you will notice the difference.
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Yes - different
chmod a+x will add the exec bits to the file but will not touch other bits. For example file might be still unreadable to others and group.
chmod 755 will always make the file with perms 755 no matter what initial permissions were.
This may or may not matter for your script.
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