Some notes on the EX200 exam.
makewhatis is gone, use mandb.-h -x -? --help
> Redirect output, target is truncated before writing starts.» Redirect output, append to target.| Connect standard output to standard input (a pipe).2> redirect stderr.# or empty space: grep ^[^#] file
grep -F <string> <file> #or fgrep
grep -v.~/.ssh/config.ssh -vvv <host>.ssh -L8080:host:80 host.ssh -X <host.sudo -i or sudo su -.visudo or add to /etc/sudoers.d/.su -s /bin/bash user.c.v.f.z.j.gzip <file>, gunzip <file>.vi or vim.echo “hi” > filename.touch.rm file.-f.-r.cp source destination.-p.-r.mv source destinationln target link-name.ln -s target link-name.ls -i.ls -l or stat file.chmod 755 or chmod o+rw etc.chown user:group target.man command.man -k command.man -K text.info command./usr/share/doc directories.reboot or shutdown -r now or systemctl isolate reboot.targetshutdown -h now or systemctl isolate poweroff.target.systemctl get-default or ls -lh /etc/systemd/system/default.targetsystemctl list-units --type target --all
systemctl rescue.systemctl emergencysingle. Boot the system.# press 'e' in the grub menu, # change add: rd.break enforcing=0 # press ctrl-x mount -o remount,rw /sysroot chroot /sysroot passwd root touch /.autorelabel mount -o remount,ro / exit exit
top.nice command -n <number -20 - 19> and renice -n <priority> <PID>. A higher number is more nice. ps -efl.journalctl.-f.-x.journalctl /usr/sbin/sshd.virsh console <vm>.virsh stop <vm>.virsh start <vm>.nmcli c shownmcli c up eth0nmcli c down eth0nmcli c edit eth0scp <file> <target-host>fdisk -l /dev/vda or fdisk /dev/vdafdisk or partedpvcreate /dev/vda2.vgextend <VGname> <PhysicalDevicePath>.lvcreate -L 5GB -n <lvname> <vgname>.lvremove /dev/<vgname>/<lvname>.blkid.UUID=7c2eaf53-ae5b-4b81-a539-b5f5d34c60c5 /boot xfs defaults,noatime 0 0e2label /dev/mapper/testV testlv/etc/fstab use: LABEL=testlv as device.partx -a /dev/vdc.partprobe.mkswap /dev/vdc1.swapon -v /dev/vdc1.swapon -s.dd if=/dev/zero of=/var/tmp/swapfile1 bs=1024 count=524288.chown root:root /var/tmp/swapfile1 chmod 0600 /var/tmp/swapfile1.mkswap /var/tmp/swapfile1.swapon /var/tmp/swapfile1.swapon -s.mkfs.<fstype>.mount -t <vfstype> <device> <directory>.showmount -e.mount <server>:mountoint <directory>.smbclient -L diskstation -U user.mount -t cifs //server/share /mnt -o user=username
pvs, vgslvresize -r -l+100%FREE <lvname>.chmod g+s /data/team.chmod g+w /data/team.chmod +t /data/teammount. But ext4 is already acl aware.mount -o remount /varls -l will show a plus sign next to the rwx modes.setfacl -m u:user:rw- <filename>ls -l, getfacl, lsattr.chmod, chown, setfacl, chattr.nmcli/etc/hosts.hostnamectl set-hostname <hostname>./etc/crontab and below directories /etc/cron.d, /etc/cron.daily, etc.min hour daymonth month dayweek(0=sun)30 4 1,15 * 5 would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday.systemctl list-unit-files --type service
systemctl start sshd.service.systemctl stop sshd.service.systemctl restart sshd.service.systemctl enable sshd.service.systemctl disable sshd.service.systemctl list-units --type target --all
systemctl get-default #or ls -lh /etc/systemd/system/default.target
systemctl get-default multi-user.target
yum -y install httpd system-config-kickstart./var/www/html/pubks=http://192.168.122.35/ks.cfgyum groupinstall Virtualization “Virtualization Tools”.virsh or virt-manager.virsh autostart <vm>nmcli above.yum-config-managerrpm or yum./etc/default/grub./etc/default/grub.grub2-mkconfig -o /boot/grub2/grub.cfggrub2-editenv listgrub2-set-defaultuseradd.usermod.userdel.passwd.chage.chage -l <username>.groupadd.groupmod.groupdel.SSSd or PAM-LDAP.authconfig-tui.firewall-cmd –get-active-zones.firewall-cmd –zone public –list-all.firewall-cmd –zone public –add-service httpd –permanent.firewall-cmd –zone public –add-source 10.1.2.3 –permanent.firewall-cmd –reload.ssh-keygen -t <type>.~/.ssh/authorized_keys on remote server.setenforce 1.setenforce 0./etc/selinux/config for permanent configuration.ls -lZ.ps -efZ.restorecon -Rv /var/www/html.getsebool -a.setsebool <boolean> <value>, use -P for permanent (at boot time)./var/log/audit/audit.log.audit2allow.