Is grep part of coreutils? (If not, why?)

coreutilsgrep

I have read in a few websites that grep comes with coreutils (e.g. https://wiki.archlinux.org/index.php/Core_Utilities)

However, after building them, I noticed that grep is missing. I wonder if I built coreutils incorrectly. If grep is not part of coreutils, what is the rationale behind excluding it?

Best Answer

The authoritative source would be http://www.gnu.org/software/software.html from the Free Software Foundation rather than the Wiki page cited in the accepted answer. On that page grep is listed as a separate piece of software.

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Grep – How to Display Lines 2-4 After Each Grep Result

The simplest way to solve it using grep only, is to pipe one more inverted grep at the end. For example:

grep -A 4 "The mail system" temp.txt | grep -v "The mail system" | grep -v '^\d*$'

Python – Why is coreutils sort slower than Python

Izkata's comment revealed the answer: locale-specific comparisons. The sort command uses the locale indicated by the environment, whereas Python defaults to a byte order comparison. Comparing UTF-8 strings is harder than comparing byte strings.

$ time (LC_ALL=C sort <numbers.txt >s2.txt)
real    0m5.485s
user    0m14.028s
sys     0m0.404s

How about that.

Best Answer

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Grep – How to Display Lines 2-4 After Each Grep Result

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