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

osinfo-query
by Dhanasekar 15 May '23

15 May '23

osinfo-query - Query information in the database syntax $ osinfo-query [OPTIONS...] TYPE [CONDITION-1 [CONDITION-2 ...]] To List all operating systems $ osinfo-query os To filter specific flavour os $ osinfo-query os vendor="Fedora Project" To filter by fields $ osinfo-query --fields=short-id,version os vendor="Fedora Project" regards, T.Dhanasekar

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1D1C - vimdiff
by Dhanasekar 14 May '23

14 May '23

vimdiff - edit two, three or four versions of a file with Vim and show differences $ cat a.txt this is line 1 this is line 2 this is line 3 this is line 4 $ cat b.txt this is line 1 this is line 2 this is line 3 this is line 5 this is line 6 $ vimdiff a.txt b.txt To split the screen horizontally $ vimdiff -o a.txt b.txt To apply changes from the left file to the right file :diffput To apply changes from the right file to the left file :diffget To undo changes :diffupdate To exit the diff window :qa to exit all the files without saving. :q to exit the files one by one without saving. :wq! to save and exit files one by one. regards, T.Dhanasekar

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1D1C - vim
by Dhanasekar 13 May '23

13 May '23

vim - Vi IMproved, a programmer's text editor To create a file $ vim filename To go Insert Mode press i Once the editor is in insert mode, start writing the content in the file. To Save the file and exit from the editor [Esc] + :wq or [Esc] + :x To save the file but do not exit. Esc + :w To quit from the file without saving Esc + :q! h- move the cursor to the left l- move the cursor to the right k- move the cursor to up one line j- moves the cursor to the down of one line H- moves the cursor to the beginning of the screen L- moves the cursor to the bottom of the screen M- moves the cursor to the middle of the screen G- moves the cursor to the end of the file gg- moves the cursor to the start of the file regards, T.Dhanasekar

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1D1C - uuidgen
by Dhanasekar 12 May '23

12 May '23

uuidgen - create a new UUID value syntax $ uuidgen [options] To create a random UUID $ uuidgen To generate time based UUID $ uuidgen -t To generate random UUID $ uuidgen -r To create a UUID based on the hash of a URL $ uuidgen --sha1 --namespace @url --name object_name $ uuidgen --md5 --namespace @url --name object_name To print help options $ uuidgen --help regards, T.Dhanasekar

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1D1C - uuidd
by Dhanasekar 11 May '23

11 May '23

uuidd - UUID generation daemon To kill running daemon $ sudo uuidd -k To turn on quiet mode $ sudo uuidd -q To test time-based generation $ sudo uuidd -t To test random-based generation $ sudo uuidd -r To run in debugging mode $ sudo uuidd -d To display help options $ sudo uuidd -h regards, T.Dhanasekar

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1D1C - users
by Dhanasekar 10 May '23

10 May '23

users - print the user names of users currently logged in to the current host To print the user name currently logged in the host $ users regards, T.Dhanasekar

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1D1C - usermod
by Dhanasekar 09 May '23

09 May '23

usermod - modify a user account syntax $ usermod [options] username To add Information to user account $ sudo usermod -c "This is test message" user1 To change user home directory $ sudo usermod -d /home/user3/ user2 To set user account expiry date $ sudo usermod -e 2025-04-04 user3 To change user primary group $ sudo usermod -g devops user4 To add group to an existing user $ sudo usermod -G web user5 To add supplementary and primary group to user $ sudo usermod -aG wheel user6 To change user login name $ sudo usermod -l new_username old_username $ sudo usermod -l user7 user6 To lock user account $ sudo usermod -L user7 To unlock user account $ sudo usermod -U user7 To move user home directory to new location from /home/user7 to /var/user7 $ sudo usermod -d /var/user7/ -m user7 To create unencrypted password for user $ sudo usermod -p passcode123 user7 To change user shell $ sudo usermod -s /bin/sh user1 To change user ID $ sudo usermod -u 666 user2 To modify the UID and GID. $ sudo usermod -u 555 -g 665 user3 regards, T.Dhanasekar

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1D1C - userdel
by Dhanasekar 08 May '23

08 May '23

userdel - delete a user account and related files syntax $ userdel [OPTIONS] USERNAME To delete a user account $ sudo userdel user1 To remove the user’s home directory and mail spool $ sudo userdel -r user2 To forcefully remove the user account $ sudo userdel -f user3 To display help options $ sudo userdel --help To remove any SELinux(Security-Enhanced Linux) user mapping for the user’s login. $ sudo userdel -Z user2 regards, T.Dhanasekar

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1D1C - useradd
by Dhanasekar 07 May '23

07 May '23

useradd - create a new user or update default new user information To add a new user $ sudo useradd user1 To create a user with a different home directory $ sudo useradd -d /home/klug user2 To create a user with a specific User ID $ sudo useradd -u 1004 user3 To create a user with a specific Group ID $ sudo -u 1004 -g admin user4 To add a user to multiple groups $ sudo useradd -G admin,devops,dev user5 To add a user without home directory $ sudo useradd -M user6 To create a user with an account expiry date $ sudo useradd -e 2024-04-04 user7 To create a user with password expiry date $ sudo -e 2024-04-04 -f 50 user1 To add a user with custom comments $ sudo useradd -c "welcome to user2" user2 To add a user without a login shell $ sudo useradd -s /sbin/nologin user3 To create user with home directory $ sudo useradd -m user4 regards, T.Dhanasekar

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1D1C - usb-devices
by Dhanasekar 06 May '23

06 May '23

usb-devices - print USB device details To print usb device details $ usb-devices regards, T.Dhanasekar

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ILUG-D May 2023