Not a bad list of “10 Linux Commands You’ve Never Used“. Obviously most of these are application to any nix variant, so are worth checking out.
My personal favourite tool –
ldd, want to know which Linux thread library java is linked to?
# ldd /usr/java/jre1.5.0_11/bin/java
libpthread.so.0 => /lib/tls/libpthread.so.0 (0x00bd4000)
libdl.so.2 => /lib/libdl.so.2 (0x00b87000)
libc.so.6 => /lib/tls/libc.so.6 (0x00a5a000)
/lib/ld-linux.so.2 (0x00a3c000)
