Siedemnaste_21
0 21 Datenblatt michalesq
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Delete the last line
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sed '$d' file. txt
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Print only lines with three consecutive digits
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sed '/[0-9]\{3\}/p' file. txt
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Unless boom is found replace aaa with bb
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sed '/boom/! s/aaa/bb/' file. txt
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Delete all lines from line 17 to 'disk'
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sed '17,/disk/d' file. txt
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How to install software for firewall and firewall-conf
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yum install firewall firewall-config
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Display firewall zones
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firewall-cmd --get-zones
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Display display default zone
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firewall-cmd --get-default-zone
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List services in default zone (public)
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firewall-cmd --list-all
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List services in home zone
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firewall-cmd --zone=home --list-all
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Not persistently add source IP to zone home, all services will be allowed for this source (disappaear after a reload/restart)
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firewall-cmd --zone=home --add-source=192.168.1.0/24
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How to reload firewalld
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firewall-cmd --reload
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Persistently add source IP to zone home, all services will be allowed for this source (needs reload/restart to appear)
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firewall-cmd --zone=home -- permanent --add-source=192.168.1.0/24
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Not persistently add port 80/tcp to zone public
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firewall-cmd --zone=public --add-port=80/tcp
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Persistently add port 80/tcp to zone public
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firewall-cmd --zone=public --permanent --add-port=80/tcp
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opens a GUI firewall config if you use graphical interface
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firewall-config
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how to generate public and private key for authentication
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ssh-keygen -t rsa
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display state of selinux
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getenforce
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changing state to permissive
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setenforce 0
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changing state to enforcing
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setenforce 1
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disable selinux
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/etc/selinux/config SELINUX=disabled
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Display full SElinux context (user, role and type)
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ls -Z
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