- ILUG-D - lists.fsci.in

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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1D1C - acpi
by Dhanasekar 12 Jul '23

12 Jul '23

acpi - Shows battery status and other ACPI information from the /proc or the /sys filesystem To view battery info $ acpi To view the ac adapter information $ acpi -a To view cooling device information $ acpi -c To view all information $ acpi -V To display the non-operational devices $ acpi -s To show additional details if available $ acpi -i To view help options $ acpi -h regards, T.Dhanasekar

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1D1C - upower
by Dhanasekar 11 Jul '23

11 Jul '23

upower - it is a system utility that provides power and battery information and statistics To view power and battery information $ upower --dump To watch for and print power status changes $ upower --monitor $ upower --monitor-detail To list all power devices $ upower --enumerate To print version of daemon and client $ upower -v To get the wakeup data $ upower -w regards, T.Dhanasekar

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1D1C - sync
by Dhanasekar 10 Jul '23

10 Jul '23

sync - it allows users to synchronize cache data to permanent system memory to save important files and prevent data loss. To synchronize all cached data for the current user to the permanent memory $ sync To sync all mounted file systems $ sudo sync To sync Specific files $ sync ./file1 ./file2 To sync file1 from home and file3 from /opt $ sync ./file1 /opt/file3 To sync file data only $ sync -d ./file1 ./file2 ./file3 To sync a directory $ sync ./test_dir To sync a file system linked to a specific file $ sync -f test_file1 $ To view help options $ sync --help regards, T.Dhanasekar

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1D1C - xfs_info
by Dhanasekar 09 Jul '23

09 Jul '23

xfs_info command is used to view the specific information of the xfs file system To view the real-time range size of the device $ xfs_info -e device_name To view the size of the device $ xfs_info -l device_name To view geometry information about an existing XFS filesystem $ sudo xfs_info /data_backup/ regards, T.Dhanasekar

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1D1C - xmllint
by Dhanasekar 08 Jul '23

08 Jul '23

xmllint - command line XML tool , useful for detecting errors both in XML code and in the XML parser itself To verify if an XML document is corrupted or not $ xmllint sample.xml To suppress the xmllint from printing the content of XML file to standard output $ xmllint --noout sample.xml To format the unformatted xml file $ xmllint --format unformatted.xml To reformat XML document with an four-space indent $ export XMLLINT_INDENT=" " # (four space) To remove the indentation spaces and newlines using xmllint $ xmllint --noblanks sample.xml To remove Document Type Definition from output from xml $ xmllint --dropdtd sample.xml To get a time profile $ xmllint --noout --timing sample.xml regards, T.Dhanasekar

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