Darwin (Mac OS X)

• Darwin docs: [fink] [apple]
• Darwin releases
• to make use of usual unix config files (/etc/{passwd,fstab, etc, etc.}): niload fstab . < /etc/fstab
  to see the actually used file content: nidump fstab .
• substitute for ldd: otool -L
• substitute of strace/truss: ktrace and kdump
• instead of LD_LIBRARY_PATH, use DYLD_LIBRARY_PATH
• frameworks
• *.dmg files are disk images; to mount them, issue hdid <file>.dmg. After that, it is possible just to umount it.
• to change default boot partition on multi-boot machine, issue something like: bless --verbose --setBoot --device /dev/disk0s3
• how to compile "universal binaries" (those containing inside two binaries for powerpc and i386 architectures)

FreeBSD

• old releases
• to setup dhcp, add to /etc/rc.conf:

  hostname=<hostname>
  ifconfig_lnc0="DHCP"
  

  (where lnc0 is a name of network interface)

NetBSD

• to set system-wide maximum number of open files: sysctl -w kern.maxfiles=<number>
• to set per-user maximum number of open files: ulimit -n <number>