Mac doesn't boot after running this code [closed] - macos

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I know this is kinda off-topic, but since I've found the code I'm talking about here on SO I hope that someone can help me.
I was dealing with a POSTGRES error and read here: Can not connect to local PostgreSQL an answer, the one from vvdpzz that lead me to run that code in my terminal.
After that, my mac stopped working and since then it doens't reboot, it comes till the apple logo that keeps flashing and switching with a folder with a question mark.
I've checked the code that curl execute and it's the following:
#!/bin/sh
BREW_POSTGRES_DIR=`brew info postgres | awk '{print $1"/bin"}' | grep "/postgresql/"`
LION_POSTGRES_DIR=`which postgres | xargs dirname`
LION_PSQL_DIR=`which psql | xargs dirname`
sudo mkdir -p $LION_POSTGRES_DIR/archive
sudo mkdir -p $LION_PSQL_DIR/archive
for i in `ls $BREW_POSTGRES_DIR`
do
if [ -f $LION_POSTGRES_DIR/$i ]
then
sudo mv $LION_POSTGRES_DIR/$i $LION_POSTGRES_DIR/archive/$i
sudo ln -s $BREW_POSTGRES_DIR/$i $LION_POSTGRES_DIR/$i
fi
if [ -f $LION_PSQL_DIR/$i ]
then
sudo mv $LION_PSQL_DIR/$i $LION_PSQL_DIR/archive/$i
sudo ln -s $BREW_POSTGRES_DIR/$i $LION_PSQL_DIR/$i
fi
done
What happened? I'm not an expert. How can I solve this. I've tried to start in secure mode by pressing the shift key while booting but it doesn't work.

Answer 1

This is a good example of why you shouldn't run scripts without understanding what they do. My guess is that one or both of LION_PSQL_DIR and LION_POSTGRES_DIR came out as empty and the script ended up moving things around in your root directory. You should be able to recover your system by following these steps:
Boot your OS X installation disc by putting it in the drive and holding the C key while booting.
From the Utilities menu, choose Terminal
Run the command cd /Volumes
Run the command ls which should show an entry corresponding to the name of your Mac's hard drive
Run the command cd "<name of your hard drive>"
Run the command ls. If the problem is that things got moved from the root of your drive, there will be an archive entry, if there isn't then stop since this will not fix your problem.
Run the command cd archive to enter the archive directory
Run the command mv * .. to move everything in the archive directory back to the root of your harddrive
Close the terminal
Run Disk Utility from the Utilities menu and use repair permissions on your drive.
Reboot your computer and hopefully it will work right now
Never run random scripts like that again.
The 10th step might not be strictly necessary. I haven't tried to do these steps myself, but they should be pretty close to correct. If you get any errors during them stop and put a comment and I will try and figure out how to proceed.