One Quickie

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Using awk to extract the n'th column (Unix->General)

nm outputs a three-column format. I needed to get the set of defined symbols (in particular those that start with __, in tracking down a C++ linking problem), which is the third column. awk is good for that. Use $N to get the nth column (zero-index). This pipeline did the trick:

 nm ./oopack.o | awk '{print $2}' | sort | grep __

(Thanks to DougEDoug for the pointer)