ls -l ./ | sed -n 's~^-.*\(\..*\)$~\1~p' | sort | uniq

grep "/test/" ./log.log | cut -d ' ' -f 1 | sort | uniq -c | sort -n | tail -n 30

iptables -A INPUT -s 192.168.10.10 -j DROP

cat access.log | cut -d'"' -f 6 | grep bot | sort | uniq

SetEnvIfNoCase User-Agent "AhrefsBot|DotBot|SemrushBot|PetalBot" bad_bot
<Limit GET POST HEAD>
Order Allow,Deny
Allow from all
Deny from env=bad_bot
</Limit>

find . -printf "%h\n" | cut -d/ -f-2 | sort | uniq -c | sort -rn

du -a . | cut -d/ -f2 | sort | uniq -c | sort -rn

curl -I https://securepayments.sberbank.ru/

wget --no-check-certificate https://securepayments.sberbank.ru/wiki/lib/exe/fetch.php/certificates:add:cert.rar

yum install unar
unar certificates:add:cert.rar

yum install unrar
unrar x certificates:add:cert.rar

update-ca-trust enable
cp Cert_CA.pem /etc/pki/ca-trust/source/anchors/
update-ca-trust extract

wget --no-check-certificate https://www.rarlab.com/rar/rarlinux-x64-5.7.1.tar.gz
tar -xvzf rarlinux-x64-5.7.1.tar.gz
~/rar/unrar x public_html.rar