3-3-12-3 tail　ログ、設定の調べ方

# for i in $(seq 1 20); do echo $i; done | tail -5
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# for i in $(seq 1 20); do echo $i; done | tail -n 5
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# for i in $(seq 1 20); do echo $i; done | tail -n +5
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# for i in $(seq 1 20); do echo $i; done | tail -n -5
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# tail --version
tail (GNU coreutils) 8.22
Copyright (C) 2013 Free Software Foundation, Inc.
ライセンス GPLv3+: GNU GPL version 3 or later .
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

作者 Paul Rubin、 David MacKenzie、 Ian Lance Taylor、
および Jim Meyering。