Useful commands for OS X

• ioreg shows I/O Kit registry. I usually use this to check the capacity of a battery in my powerbook

ioreg -p IODeviceTree -n "battery" -w 0 | grep IOBatteryInfo

• hdiutil manipulates disk images: I usually use this to merge several dmg files to one iso file.

hdiutil makehybrid -iso -o /path/to/make/your/iso/file.iso /directory/of/the/source/dmg/files/

• chflags change file flags: I usually use this to unlock files with uchg, nodump, some other flags.

sudo find . -flags uchg -exec chflags nouchg {} \;
  or
sudo chflags -R nouchg .

• fsaclctl controls the ACL on the specific path.

usage:  fsaclctl -p path | -a  [-e enable] [-d disable] [-v]
                -p              path to filesystem mount point
                -a              operate on all relevant volumes
                -e              enable access control lists on this filesystem
                -d              disable access control lists on this filesystem
                -v              print version