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http://ru.wikipedia.org/wiki/Less
http://ru.wikipedia.org/wiki/Tail
$ tail -n 5 /var/log/messages $ kubectl -n portal get po | tail -n +2 | grep -v "postg" | awk '{print $1}' | xargs kubectl -n portal delete po $ sudo tail -fn0 /var/log/auth.log | stdbuf -o0 grep abcd | while read L; do echo $L | mail -s abcd userX@isp.un; done # stdbuf -i0 -o0 u2spewfoo <(tail -c +1 -f /var/log/snort/snort.alert) > /var/log/snort/snort.alert.txt.log