- ILUG-D - lists.fsci.in

1D1C - clockdiff
by Dhanasekar 20 Aug '23

20 Aug '23

clockdiff - measure clock difference between hosts To check the time difference between two hosts 192.168.122.10 192.168.122.20 $ sudo clockdiff 192.168.122.10 192.168.122.20 To check the time difference between the local host and a remote host $ sudo clockdiff localhost ilugc.in regards, T.Dhanasekar

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1D1C - mtr
by Dhanasekar 19 Aug '23

19 Aug '23

mtr - a network diagnostic tool To display mtr output without options $ mtr google.com To display numeric IP addresses $ mtr -n google.com To display both host names as well as numeric IP numbers $ mtr -b google.com To limit the number of pings to a specific value $ mtr -c5 ilugc.in To set it into report mode $ mtr -r -c 4 ilugc.in > mtr-report To enable wide report mode $ mtr -rw -c 4 ilugc.in > mtr-report To change the interval between ICMP ECHO requests to a specified value $ mtr -i 3 ilugc.in To use TCP SYN packets or UDP datagrams $ mtr --tcp ilugc.in $ mtr --udp ilugc.in regards, T.Dhanasekar

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1D1C - faillock
by Dhanasekar 18 Aug '23

18 Aug '23

faillock - Tool for displaying and modifying the authentication failure record files To list ssh login failures of all users $ sudo faillock To list login failures of the specified user $ sudo faillock --user <username> To reset the failure records of the specified user $ sudo faillock --user <user_name> reset regards, T.Dhanasekar

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1D1C - bootctl
by Dhanasekar 17 Aug '23

17 Aug '23

bootctl - it check the EFI firmware and boot loader status, list and manage available boot loaders and boot loader entries, and install, update, or remove the systemd-boot(7) boot loader on the current system To display information about the system firmware and the bootloaders $ bootctl status To set a flag to boot into the system firmware on the next boot $ bootctl reboot-to-firmware true To display all available bootloader entries $ bootctl list To Install systemd-boot into the EFI system partition $ bootctl install To remove all installed versions of systemd-boot from the EFI system partition $ bootctl remove regards, T.Dhanasekar

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1D1C - nmtui
by Dhanasekar 16 Aug '23

16 Aug '23

nmtui - Text User Interface for controlling NetworkManager To open the user interface $ nmtui To display a list of available connections, with the option to activate or deactivate $ nmtui connect To set the system hostname $ nmtui <hostname> To edit/add/delete a given network $ nmtui edit name or $ nmtui edit id To connect to a given network $ nmtui connect name $ nmtui connect uuid $ nmtui connect device $ nmtui connect SSID regards, T.Dhanasekar

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1D1C - sudoreplay
by Dhanasekar 15 Aug '23

15 Aug '23

sudoreplay - replay sudo session logs Before running this command add these lines to the end of the sudoers file $ sudo vim /etc/sudoers Defaults log_output Defaults!/usr/bin/sudoreplay !log_output Defaults!/sbin/reboot !log_output :wq! save and exit To list sessions run by user venus $ sudo sudoreplay -l user venus To list sessions run by user venus with a command containing the string vim $ sudo sudoreplay -l user venus command vim regards, T.Dhanasekar

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1D1C - mkinitrd
by Dhanasekar 14 Aug '23

14 Aug '23

mkinitrd - it is used to create an image file that is loaded into the RAM disk during the boot process syntax $ sudo mkinitrd [options] <initrd-image> <kernel-version> $ sudo apt install dracut-core To create a new image file $ sudo mkinitrd -f /boot/initrd.img-5.11.0-051100-generic 5.11.0-051100-generic To display verbose output during the creation of the image file $ sudo mkinitrd -v -f /boot/initrd.img-5.11.0-051100-generic 5.11.0-051100-generic regards, T.Dhanasekar

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1D1C - expr
by Dhanasekar 13 Aug '23

13 Aug '23

expr - evaluate expressions To add two numbers $ expr 11 + 5 To subtract two numbers $ expr 20 - 10 To divide two numbers $ expr 20 / 4 To divide two numbers and want to see the remainder $ expr 25 % 6 To multiply two numbers $ expr 6 \* 4 To find the length of a string $ expr length indianlinuxusergroupchennai To check the index of character x $ a=kanchilinuxusergroup $ b=`expr index $a x` $ echo $b To extract the substring $ a=indianlinuxusergroupchennai $ b=`expr substr $a 21 27` $ echo $b To get the index of a substring from a string $ expr substr indianlinuxusergroupchennai 21 27 To compare two expressions $ a=50 $ b=60 $ c=`expr $a = $b` $ echo $c To match the number of characters of two string $ expr linuxos : linux $ expr linuxos : linuxo regards, T.Dhanasekar

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1D1C - export
by Dhanasekar 12 Aug '23

12 Aug '23

export - It is used to mark variables and functions to be passed to child processes To display all exported variables $ export To view all exported variables on the current shell $ export -p The variable ‘community’ has been assigned the value ‘ilugc’ $ community=ilugc $ export community check with $ printenv community To export shell function $ name() { echo "ilugc"; } $ export -f name $ bash $ name regards, T.Dhanasekar

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1D1C - disown
by Dhanasekar 11 Aug '23

11 Aug '23

disown - it is used to remove jobs from the job table $ ping google.com ^Z To list all current jobs $ jobs -l To remove all jobs $ disown -a To remove specific jobs $ disown %1 To remove the last job on the job table $ disown To remove currently running jobs $ disown -r To keep jobs running after log out $ disown -h <job_ID> regards, T.Dhanasekar

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