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

1D1C - updatedb
by Dhanasekar 04 Aug '23

04 Aug '23

updatedb - update a database for plocate To refresh database content for locate command $ sudo updatedb To print paths of files as they are found $ sudo updatedb --verbose regards, T.Dhanasekar

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1D1C - mpstat
by Dhanasekar 31 Jul '23

31 Jul '23

mpstat - Report processors related statistics To report the processor stats $ mpstat 5 10 To report all processor stats $ mpstat -A 5 10 To get the processor number for which the stats are displaying $ mpstat -P 3 10 To display statistics for processor one (0) and processor two (1), and update at an interval of 2 seconds $ mpstat -P 0,1 3 To get the version info $ mpstat -V To report the CPU utilization stats $ mpstat -u 3 10 regards, T.Dhanasekar

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1D1C - mkhomedir_helper
by Dhanasekar 30 Jul '23

30 Jul '23

mkhomedir_helper - Helper binary that creates home directories To make user home folder after account creation $ sudo mkhomedir_helper <username> $ sudo mkhomedir_helper ilugc regards, T.Dhanasekar

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1D1C - nologin
by Dhanasekar 29 Jul '23

29 Jul '23

nologin - politely refuse a login First check nologin exists in /etc/shells $ cat /etc/shells if nologin is not found then append # echo "/usr/sbin/nologin" >> /etc/shells To set a user’s shell to nologin # usermod <username> -s /sbin/nologin # usermod ilugc -s /sbin/nologin regards, T.Dhanasekar

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1D1C - rename
by Dhanasekar 28 Jul '23

28 Jul '23

rename - renames multiple files $ touch a.jpg b.jpg c.jpg d.jpg $ ls a.jpg b.jpg c.jpg d.jpg To change .jpg to png $ rename -v 's/jpg/png/' *.jpg To change above files to uppercase $ rename 'y/a-z/A-Z/' *.png To change above upper case files to lowercase $ rename 'y/A-Z/a-z/' *.PNG regards, T.Dhanasekar

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kubernetes community day 2023 slides
by Dhanasekar 27 Jul '23

27 Jul '23

Hi The kubernetes community days 2023 was held on July 22, 2023 at chennai. Speaker slides of all the talks are available on Github https://github.com/kcdchennai/kcdchennai/tree/main/2023/Speaker%20Slides%20… videos of the event will be shared on Youtube soon regards, T.Dhanasekar

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1D1C - pinky
by Dhanasekar 27 Jul '23

27 Jul '23

Pinky - it prints the user information To display the information about the users $ pinky To produce the long format output $ pinky -l <username> To Omit Column Headings $ pinky -f To remove the name and where column $ pinky -i To remove the name, idle and where columns $ pinky -q regards, T.Dhanasekar

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1D1C - machinectl
by Dhanasekar 26 Jul '23

26 Jul '23

machinectl - used to execute operations on VM machines and images To List running VMs and containers $ machinectl list To Show VM/container details $ machinectl status <vm_name> To Show properties of one or more VMs/containers $ machinectl show <vmname> To power off the vm $ machinectl poweroff <vm_name> regards, T.Dhanasekar

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1D1C - lsscsi
by Dhanasekar 25 Jul '23

25 Jul '23

lsscsi - list SCSI devices (or hosts), list NVMe devices To list SCSi devices $ lsscsi To get classic output $ lsscsi -c To get the device name , device node major and minor numbers $ lsscsi -d To display scsi generic device file name $ lsscsi -g To list the SCSI hosts currently attached to the system $ lsscsi -H To display additional information in pairs $ lsscsi -L To display additional information for each SCSI device $ lsscsi -l regards, T.Dhanasekar

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1D1C - eval
by Dhanasekar 24 Jul '23

24 Jul '23

eval - built-in shell command used to evaluate and execute strings as a shell command eval is to interpret and execute dynamic or complex commands stored in strings or variables syntax $ eval [arguments] To Store Command in a Variable $ var="free -h" $ eval "$var" To substitute command $ command="echo \$(uptime)" $ eval "$command" To generate and execute commands inside a loop dynamically $ vim newscript.sh #!/bin/bash for i in {1..10}; do eval "echo 'Loop iteration $i'" done :x save and exit run $ bash newscript.sh regards, T.Dhanasekar

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ILUG-D July 2023