September 2023 - ILUG-D - lists.fsci.in

1D1C - avcstat
by Dhanasekar 08 Sep '23

08 Sep '23

avcstat - Display SELinux AVC statistics To print short output of the access vector cache statistics since boot $ sudo avcstat To show output at one second interval $ sudo avcstat 1 To show output at 5 seconds interval $ sudo avcstat 5 regards, T.Dhanasekar

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1D1C - chronyc
by Dhanasekar 07 Sep '23

07 Sep '23

chronyc - is a command-line utility for managing and monitoring the chrony daemon, which is a daemon that provides network time synchronization on Linux systems To display the status of the chrony daemon $ chronyc tracking To start chronyc in interactive mode $ chronyc chronyc> To print the time sources that Chrony is currently using $ chronyc sources To display stats for sources currently used by chrony daemon as a time source $ chronyc sourcestats To display verbose information about each NTP source $ sudo chronyc ntpdata regards, T.Dhanasekar

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1D1C - rpmquery
by Dhanasekar 06 Sep '23

06 Sep '23

rpmquery - is used to query package information from the RPM database To display information about a specific package $ sudo rpmquery vsftpd $ sudo rpmquery httpd To display information about multiple packages $ sudo rpmquery vsftpd httpd bind To display the version number of a package $ sudo rpmquery -q httpd To display the files that are included in a package $ sudo rpmquery --list bind $ sudo rpmquery --list httpd To display the architecture of a package $ sudo rpmquery --queryformat '%{ARCH}\n' httpd regards, T.Dhanasekar

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1D1C - rpmverify
by Dhanasekar 05 Sep '23

05 Sep '23

rpmverify - verifies the correctness of installed RPM packages To verify the correctness of the vsftpd , httpd package $ rpmverify vsftpd $ rpmverify httpd To verify all installed packages $ rpmverify -a regards, T.Dhanasekar

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1D1C - semodule
by Dhanasekar 04 Sep '23

04 Sep '23

semodule - Manage SELinux policy modules To view the policy module loaded by SELinux $ sudo semodule -l To view the apache policy module $ sudo semodule -l | grep apache To disable the zabbix policy module $ sudo semodule -d zabbix regards, T.Dhanasekar

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1D1C - firewall-offline-cmd
by Dhanasekar 03 Sep '23

03 Sep '23

firewall-offline-cmd - firewalld offline command line client It should be used only if the firewalld service is not running To add a port to firewall daemon when firewalld is offline $ sudo firewall-offline-cmd --port=80:tcp $ sudo firewall-offline-cmd --port=443:tcp $ sudo firewall-offline-cmd --port=3306:tcp To remove a port to firewall daemon when firewalld is offline $ sudo firewall-offline-cmd --remove-port=80:tcp $ sudo firewall-offline-cmd --remove-port=443:tcp $ sudo firewall-offline-cmd --remove-port=3306:tcp $ sudo firewall-offline-cmd --remove-port=53:tcp To list all the ports under all the zones $ sudo firewall-offline-cmd --list-all regards, T.Dhanasekar

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1D1C - PS1
by Dhanasekar 02 Sep '23

02 Sep '23

PS1 - is the current bash shell prompt To display current bash shell prompt setting $ echo $PS1 To print the current settings from your ~/.bashrc $ grep PS1 ~/.bashrc To customise the bash prompt to ilugc > temporarily $ PS1="\e[1;32milugc> \e[m" To display customised colours for bash prompt $ PS1="\e[1;32milugc> \e[m" $ PS1="\e[1;33milugc> \e[m" $ PS1="\e[1;35milugc> \e[m" $ PS1="\e[1;36milugc> \e[m" $ PS1="\e[1;37milugc> \e[m" $ PS1="\e[1;38milugc> \e[m" To make the above bash prompt permanently $ vim ~/.bashrc comment the old entries with PS1 then add the entry PS1="\e[1;32milugc> \e[m" : wq! save and exit then $ source ~/.bashrc To make system wide $ sudo vim /etc/profile comment the old entries with PS1 then add the entry PS1="\e[1;32milugc> \e[m" : wq! save and exit then # source /etc/profile To set emoji in bash prompt $ PS1="\e[1;32milugc🎄 \e[m" PS1="\e[1;32milugc🦌 \e[m" regards, T.Dhanasekar

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1D1C - set
by Dhanasekar 01 Sep '23

01 Sep '23

set - is used to set and unset certain flags or settings within the shell environment syntax $ set [options] To display a list of all system settings $ set To print help options $ set --help To turn on the debugging information in a shell script $ set -x To turn off the debugging information $ set +x To disable the default behavior of Bash $ set -C To stop a script immediately $ set -e regards, T.Dhanasekar

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ILUG-D September 2023