After migrating Current website to Debian 6, PHP calls exec and system stopped working.
The reason for it is debian package dash which modifies behaviour of system default shell:
# ls -l /bin/sh lrwxrwxrwx 1 root root 4 Dec 9 20:25 /bin/sh -> dash
To revert this this behaviour to standard, execute
# dpkg-reconfigure dash
Select “No” and default shell will be changed to standard bash.
You can check it with following command:
# ls -l /bin/sh lrwxrwxrwx 1 root root 4 Dec 9 20:26 /bin/sh -> bash
