Linux Handbook

This is simple unsorted various commands to quick remember useful Linux operation. You also can see hundred various recipes in this page - Linux.

1. Ubuntu server

• Open Firewall for WebServer


• Firewall rules order



• PermitRootLogin SSHD (sudo nano /etc/ssh/sshd_config,PertitLogin=yes,Service sshd restart, sudo passwd root)


• SCP Copy Over SSH


• Add Second User With The Same Home Contents


• List all service


• File permission - everyone can write file (-R recursive) sudo chmod u+rw,g+rw,o+rw tst1


• Ifconfig set IP anf gateway


• Ubuntu second IP


• Ubuntu 20 IP configuration (sudo nano /etc/netplan/00-installer-config.yaml)



• Disk manipulating - lsblk, fdisk, mkfs, /etc/fstab, mount, raid



• Increase swap



• IO monitoring (sudo apt install sysstat, watch iostat -x)



• Network monitoring iftop, Iptraf-ng, cat /proc/net/vlan, bmon, dstat

2. CentOS server

• List device and mount cdrom

• List device and mount cdrom


• Network diagnostic (nslookup, wget, mtr, route, ifconfig, resolv.config, etc/hosts, ethtool, ftp upload)


• SSL diagnostic (openssl s_client -debug -cipher ALL -servername github.com -connect github.com:443), github, generate ssh key, add key yo ssh client

3. OpenSuse desktop

• Switch Suse repository by Yast


• Zypper list (history and by repository) and remove packages.


• XfsDump


• Fdisk And Boot Partition Flag


• Check Disk Performance


• ProtonVpn


• Switch for mounting SMB shares


• DD over FTP with Gzip


• List all hardware


• Desktop link to application


• Open SSH


• Map /home to another drive (mkdir -p /srv/home, mount /dev/sdb1 /srv/home, cp -aR /home/* /srv/home/, blkid /dev/sdb1, sudo nano /etc/fstab)


• Perform boot from HD and map /home to /dev/nvme0n1


• Find project file count and find code string count

3. Other

• Allow Ftp transfer Special Chars to filenames


• mRemoteNG ShowPass


• FF PortBlocked

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