antirez/redis — pull request #1148 by nsabine (2013-06-07 16:14:22+00:00)
Title: Correct syntax error in install_server.sh

Shell ! operator requires a space. In the current script, all defaults are accepted automatically because the "if" statements silently error.

RedHat Enterprise 6.4
```
sh-4.1$ which chkconfig
/sbin/chkconfig
```

example:
```
sh-4.1$ if [ !`which chkconfig` ]; then echo "won't get here"; fi
sh: !`which: event not found
```

corrected:
```
sh-4.1$ if [ ! `which chkconfig` ]; then echo "not found"; else echo "found"; fi
found
```