osx - Hosts file missing on Mac OS X - Xcode Failing to compile code -


i've tried run first objective-c code in xcode... compilation process successfully, error returns " invalid host string: 'localhost' ".

after googling, found out , connected points might had hosts file deleted.

now cannot recreate /etc/hosts through terminal using:

sudo cat >/etc/hosts <

#

host database

#

localhost used configure loopback interface

when system booting. not change entry.

#

127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%1o0 localhost eod sudo: /private/etc/sudoers mode 0666, should 0440

thanks in advance workaround.

you have broken system making inappropriate changes.

first, need fix permissions on /etc/sudoers. might try opening disk utility, selecting system volume, , clicking repair disk permissions. not sure change sudoers permissions. if not, reboot system , press , hold command , s keys. boots single-user mode. when command prompt appears, enter these commands:

mount -uw / chmod 0666 /etc/sudoers reboot

when system boots, sudo command might working again, if have not otherwise broken it. @ point, may able recreate /etc/hosts. in addition restoring contents, may need set ownership , permissions:

sudo chown root:wheel /etc/hosts sudo chmod u=rw,go=r /etc/hosts

you restore /etc/hosts while in single-user mode, rather booting , using sudo command. before reboot command, use cat (or cp copy file prepared previously) recreate /etc/hosts, execute chown , chmod commands (without sudo), reboot.

i cannot guarantee these commands suffice or there no errors; diagnosing problems such remotely troublesome.

stop tinkering system without making backups know work or taking other steps able revert changes.


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