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Disk Usage
du -hs /home/*df -h -
RAM monitoring
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RAM monitoring
Lister les ip bannies :
`iptables -L f2b-SSH`Débannir l’ip correspondante à la ligne :
`iptables -D f2b-SSH 2` -
Search a string in multiple files
find . -name "*.log" | xargs grep -nRi "root" -
Delete shell history line
history | tail -n 10history -d xxx -
System installation date
ls -lct /etc | tail -1 | awk '{print $6, $7, $8}'lsb_release -atail -f -n 100 /var/log/nginx/error.log -
Recursively chmod only files
find . -type f -exec chmod 644 {} \; -
List TCP ports that are being listened on, and the name of each listener’s daemon and its PID
netstat -plnt
service php7.4-fpm restart
service php7.4-fpm status
systemctl restart mariadb
mysql -e "show variables like 'pid_file'"
+---------------+------------------------+
| Variable_name | Value |
+---------------+------------------------+
| pid_file | /run/mysqld/mysqld.pid |
+---------------+------------------------+
mysql -e "show variables like 'log_error'"
+---------------+--------------------------+
| Variable_name | Value |
+---------------+--------------------------+
| log_error | /var/log/mysql/error.log |
+---------------+--------------------------+
mysql -e "show variables like 'max_allowed_packet'"
+--------------------+----------+
| Variable_name | Value |
+--------------------+----------+
| max_allowed_packet | 67108864 |
+--------------------+----------+
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Certbot challenges
certbot certonly --standalone -d my-domain.comcertbot certonly --manual --preferred-challenges dns -d my-domain.comcertbot certonly --manual --expand --preferred-challenges dns -d my-domain.comcertbot certonly --webroot --webroot-path /home/prodUD/www/ -d my-domain.comcertbot-auto certonly --manual --manual-public-ip-logging-ok --manual-auth-hook "/etc/letsencrypt/lexicon-ovh.sh create" --manual-cleanup-hook "/etc/letsencrypt/lexicon-ovh.sh delete" --preferred-challenges dns -d my-domain.com
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Search replace
:g/str_Search/s//str_Replace/g
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list email
mailq -
delete all emails
postsuper -d ALLpostqueue -f -
find an email with complex ID
cat /var/log/mail.log.1 | grep "IrKhhvilgRYJyI8JbSbAyn8PAftverkXSbla8YRM@luxeol.com" Feb 20 10:05:37 s02 postfix/cleanup[14016]: 4CCDE197F: message-id=<IrKhhvilgRYJyI8JbSbAyn8PAftverkXSbla8YRM@luxeol.com> -
read an email by ID
postcat -q F10EB4254