Reinstall/repair Apache Installation from base system

Question

Hi,
I use Snow Leopard and I was not aware of the fact that php and apache2 comes with the base installation. I delete now some .so files like /usr/libexec/apache/modauthnfile.so, so I'm not able to start apache anymore.
How can I reinstall apache so that the deleted files will be restored?
Thanks for help,
Matthias

Answer 1

Hello,
Option 3 (advanced): Use the command line and the fsck_hfs -l command.
Start up your computer and log in as an administrator.
Open Terminal (/Applications/Utilities).
At the prompt, type the following command and then press Return to determine your filesytem ID:
df -hl
Look for some lines of text that look like this:
Filesystem     Size   Used  Avail Capacity  Mounted on
/dev/disk0s3    37G    20G    17G    55%    /
/dev/disk0s5    37G    37G   641M    98%    /Volumes/Storage
Make a note of the first "disk" name that appears after /dev/, such as "disk0s3." This is your filesystem ID for your startup volume.
At the prompt, type the following command and then press Return:
df -hl
Then type the following command, where "disk0s3" is your filesystem ID you noted in step 4, then press Return:
sudo fsck_hfs -l /dev/disk0s3
When prompted, enter your admin password, then press Return to begin the verification.
You should see messages like these during the disk check:
** /dev/rdisk0s3 (NO WRITE)
** Root file system
** Checking HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
** Checking multi-linked files.
** Checking Catalog hierarchy.
** Checking Extended Attributes file.
** Checking volume bitmap.
** Checking volume information.
** The volume Macintosh HD appears to be OK.
http://support.apple.com/kb/ts1417