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Problem: A program might have few dependencies and might have a small disk size, but how many libraries and sub-libraries does it use? How much memory does it and all its libraries actually take?

Learning about actual memory usage ∞

ps -ao comm,size,rss,vsize

COMMAND            SZ   RSS    VSZ
zsh               532  1504   5556
geany           14320 17136  47980
zsh               552  1612   5576
geany           12832 15316  46140
ruby            11536 12080  17600
sleep             292   492   4012
ps                636   772   4484

Learning about the libraries ∞

ldd firefox-bin

          linux-gate.so.1 =>  (0xffffe000)
          libpthread.so.0 => /lib/i686/libpthread.so.0 (0xb786c000)
          libxul.so => not found
          libxpcom.so => not found
          libmozalloc.so => not found
          libplds4.so => /lib/libplds4.so (0xb7866000)
          libplc4.so => /lib/libplc4.so (0xb7860000)
          libnspr4.so => /lib/libnspr4.so (0xb7823000)
          libdl.so.2 => /lib/libdl.so.2 (0xb781e000)
          libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb7735000)
          libm.so.6 => /lib/i686/libm.so.6 (0xb770a000)
          libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0xb76ec000)
          libc.so.6 => /lib/i686/libc.so.6 (0xb756e000)
          /lib/ld-linux.so.2 (0xb7897000)

Counting the number of libraries ∞

ldd firefox-bin | wc -l
14