Like the subtitle says, these should be obvious, but I’m forever looking them up.

#1:  Find files in a perforce checkout that are not checked in or are modified:
for file in `p4 diff -f -sa`; do p4 diff -f $file; done

#2 Crosscompile FreeBSDi386 on amd64, its stupid simple, but I can never remember:
TARGET=i386 TARGET_ARCH=i386 MAKEOBJDIRPREFIX=/var/tmp make -s -j16 buildworld
TARGET=i386 TARGET_ARCH=i386 MAKEOBJDIRPREFIX=/var/tmp make -s -j16 buildkernel KERNCONF=PAE