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Merge pull request #491 from mkwardakov/awk-dup
Fix #67: remove awk example duplicate
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- You can set a specific command's environment by prefixing its invocation with the environment variable settings, as in `TZ=Pacific/Fiji date`.
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- You can set a specific command's environment by prefixing its invocation with the environment variable settings, as in `TZ=Pacific/Fiji date`.
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- Know basic `awk` and `sed` for simple data munging. For example, summing all numbers in the third column of a text file: `awk '{ x += $3 } END { print x }'`. This is probably 3X faster and 3X shorter than equivalent Python.
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- Know basic `awk` and `sed` for simple data munging. See [One-liners](#one-liners) for examples.
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- To replace all occurrences of a string in place, in one or more files:
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- To replace all occurrences of a string in place, in one or more files:
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```sh
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```sh
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