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

1D1C - iotop
by Dhanasekar 23 Jul '23

23 Jul '23

iotop - it allows the user to monitor I/O usage in the disk To print the details of disk I/O usage $ sudo iotop To print processes that are actually doing disk I/O $ sudo iotop -o To print the output in non-interactive or batch mode $ sudo iotop -b To display disk I/O details of a particular process $ sudo iotop -p <pid> To set the number of iterations $ sudo iotop -n 5 $ sudo iotop -n 10 To display the output with timestamp $ sudo iotop -t To display only the I/O usage by user home $ sudo iotop -u To get details of processes $ sudo iotop -P To display without header lines $ sudo iotop -q To display disk IO usage in KB $ sudo iotop -k regards, T.Dhanasekar

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1D1C - locate
by Dhanasekar 22 Jul '23

22 Jul '23

locate - find files by name, quickly To search for a file $ locate <file_name> $ locate sample.pdf $ locate sample.txt To search and show only the existing files in the system $ locate -e <file_name> To print the number of matched files $ locate -c <file_name> To limit the number of search $ locate *.txt -n 15 To Ignore case sensitive files $ locate -i test_file regards, T.Dhanasekar

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1D1C - iostat
by Dhanasekar 20 Jul '23

20 Jul '23

iostat - Report CPU statistics and i/o statistics for devices and partitions To display report for all CPU and devices $ iostat To display the CPU utilization report $ iostat -c To display continuous CPU utilization report at specific seconds interval $ iostat -c 5 $ iostat -c 10 To display the device utilization report $ iostat -d To display specific device utilization reports at specific second intervals $ iostat -d 5 5 $ iostat -d 3 10 To display the registered device mapper names $ iostat -N To display the report in human-readable format $ iostat -h To view the extended statistics $ iostat -x To display the timestamp for each report $ iostat -t To display statistics for a specific device and its partitions $ iostat -p sda $ iostat -p vda To display statistics for all the block devices and partitions $ iostat -p ALL To display statistics for a group of devices $ iostat -g docker $ iostat -g kvm $ iostat -g sudo To print output in JSON format $ iostat -c -o JSON regards, T.Dhanasekar

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1D1C - lsipc
by Dhanasekar 19 Jul '23

19 Jul '23

lsipc - show information on IPC facilities currently employed in the system To print output without options $ lsipc To view the information about shared memory $ lsipc --shmem To print output in json format $ lsipc -J $ lsipc --json -o resource,limit,used To display specific columns $ lsipc --shmem -o KEY,SIZE,PERMS To display help options $ lsipc -h regards, T.Dhanasekar

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1D1C - lnstat
by Dhanasekar 18 Jul '23

18 Jul '23

lnstat - unified linux network statistics To view the unified network statistics $ sudo lnstat To print the number of intervals $ sudo lnstat -c 15 To dump list of available files/keys $ sudo lnstat -d To set the interval to specified seconds $ sudo lnstat -i 20 To specify the width for every field $ sudo lnstat --width 3,3,3 To print help options $ sudo lnstat -h $ To print output in JSON format $ sudo lnstat -j To display statistics files supported by the command $ sudo lnstat -d regards, T.Dhanasekar

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1D1C - lid
by Dhanasekar 17 Jul '23

17 Jul '23

lid - Shows users belonging to a given group To view users in a group $ sudo libuser-lid -g sudo $ sudo libuser-lid -g kvm $ sudo libuser-lid -g docker To hide GID/UID $ sudo libuser-lid -ng sudo $ sudo libuser-lid -ng kvm regards, T.Dhanasekar

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1D1C - kexec
by Dhanasekar 16 Jul '23

16 Jul '23

kexec is a system call that enables you to load and boot into another kernel from the currently running kernel To load the new kernel # kexec -l path/to/kernel --initrd=path/to/initrd --command-line=arguments To load a new kernel with current boot parameters # kexec -l path/to/kernel --initrd=path/to/initrd --reuse-cmdline To execute a currently loaded kernel # kexec -e To unload current kexec target kernel # kexec -u regards, T.Dhanasekar

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1D1C - exec
by Dhanasekar 15 Jul '23

15 Jul '23

exec - is used to execute a command from the bash itself set hostname with $ hostnamectl set-hostname ilugc.hashlabs.in to make effect the hostname without rebooting $ exec bash exec with a command as an argument $ bash $ exec df -Th To change the permission of files $ sudo find /home/ilugc/Downloads -type f -exec chmod 755 {} \; regards, T.Dhanasekar

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1D1C - tracepath
by Dhanasekar 14 Jul '23

14 Jul '23

tracepath - traces path to a network host discovering Maximum transmission unit along this path To trace path to destination $ tracepath www.ilugc.in $ tracepath www.google.com To print primary IP addresses numerically $ tracepath -n www.ilugc.in To print both of host names and IP addresses $ tracepath -b www.ilugc.in To set maximum hops $ tracepath -m 31 www.ilugc.in regards, T.Dhanasekar

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1D1C - test
by Dhanasekar 13 Jul '23

13 Jul '23

test - check file types and compare values $ test EXPRESSION To test a value $ test 10 -gt 9 && echo "Yes, that's true." || echo "No, that's false." $ test 9 -gt 10 && echo "Yes, that's true." || echo "No, that's false." $ test 1000 -lt 999 && echo "Yes." || echo "No." $ test 999 -lt 1000 && echo "Yes." || echo "No." regards, T.Dhanasekar

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ILUG-D July 2023