- ILUG-D - lists.fsci.in

1D1C - sort
by Dhanasekar 24 Feb '23

24 Feb '23

sort - is used to sort a file, arranging the records in a particular order. $ cat file.txt assam tamilnadu chattisgarh delhi gujarat himachal pradesh kerala bihar To sort arrange the file.txt $ sort file.txt To Save Output to File $ sort file.txt > sorted.txt To Check for Sorting in File $ sort -c file.txt To Sort Multiple Files $ sort file1.txt file2.txt To Sort in Reverse Order $ sort -r file.txt To Remove Duplicate Entries $ sort -u file.txt To Sort by Months $ ls -l > month.txt $ sort -Mk6 month.txt To Randomly Sort Data $ sort -R sorted.txt regards, T.Dhanasekar

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1D1C - snap
by Dhanasekar 23 Feb '23

23 Feb '23

snap - is used to install, configure, refresh and remove snaps $ sudo snap install snap-store To Install Snap Apps $ sudo snap install <package_name> To list Installed snaps $ snap list To Search for Snaps $ snap find <search_term> To update snaps $ snap refresh <package_name> To print which snap packages have available updates $ sudo snap refresh --list To downgrade Snaps $ sudo snap revert <package_name> To remove Snaps $ sudo snap remove <package_name> To remove a snap without generating a snapshot $ sudo snap remove <package_name> --purge To Disable Snaps $ sudo snap disable <package_name> To Enable a disabled snap $ sudo snap enable <package_name> To List All Running Services $ snap services To list the services of a single snap $ snap services <package_name> To Start, Restart, and Stop Snap Services $ sudo snap restart <package_name> $ sudo snap start <service_name> $ sudo snap stop <package_name> To prevent a snap service from starting on boot $ sudo snap stop --disable <service_name> To make a service to start on next boot $ sudo snap start --enable <service_name> To Download and Install Snap Apps Offline $ snap download <package_name> To display history of changes made to system $ snap changes To change to a different channel $ sudo snap refresh <package_name> --channel=<channel_name> $ sudo snap refresh youtube-dl --channel=stable regards, T.Dhanasekar

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1D1C - slogin
by Dhanasekar 22 Feb '23

22 Feb '23

slogin - is an alias for the ssh client, which is used to connect securely to a remote shell. To login to a remote server $ slogin 192.168.122.50 $ slogin user1(a)192.168.122.50 To login to remote server with port $ slogin -p 22 user1(a)192.168.122.50 To to login as user1 on the remote machine $ slogin -l user1 192.168.122.50 regards, T.Dhanasekar

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1D1C - sleep
by Dhanasekar 21 Feb '23

21 Feb '23

sleep - is used to delay for a fixed amount of time during the execution of any script syntax $ sleep number[suffix] To make sleep command without any suffix $ sleep 20s To display help options $ sleep --help $ cat sleep.sh #!/bin/bash echo "Waiting for 10 seconds..." sleep 10 echo "Task Completed" :x $ sh sleep.sh Waiting for 10 seconds... Task Completed sleep command in the terminal with other commands $ ll && sleep 20 && pwd && free -h regards, T.Dhanasekar

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1D1C - skill
by Dhanasekar 20 Feb '23

20 Feb '23

skill - is used to send signals to users and process To halt/stop user1 $ skill -STOP -u user1 To resume already halted user1 $ skill -CONT -u user1 To kill and logout user1 $ skill -KILL -u user1 To kill and logout all users $ skill -KILL -v /dev/pts/* To stop 3 users user1, user2, user3 $ skill -STOP user1 user2 user3 regards, T.Dhanasekar

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1D1C - size
by Dhanasekar 19 Feb '23

19 Feb '23

size - list section sizes and total size of binary files $ cat hello.c #include <stdio.h> int main() { // printf() displays the string inside quotation printf("Hello, World!"); return 0; } $ gcc hello.c -o hello.o $ size hello.o To display in octal $ size -o hello.o To display in hexadecimal $ size -x hello.o To display in system V format and hexadecimal values $ size -Ax hello.o regards, T.Dhanasekar

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1D1C - shutdown
by Dhanasekar 18 Feb '23

18 Feb '23

shutdown - is used to shutdown the system in a safe way syntax $ shutdown [OPTIONS] [TIME] [MESSAGE] To shutdown the system at a specified time 6 P.M $ sudo shutdown 18:00 To schedule a system shutdown in 30 minutes from now $ sudo shutdown +30 To shutdown the system immediately $ sudo shutdown now To shutdown the system in 30 minutes from now and notify the users with message “system upgrade” $ sudo shutdown +30 "system upgrade" To halt your system $ sudo shutdown -H To make shutdown power-off machine $ sudo shutdown -P To reboot using shutdown $ sudo shutdown -r To specify a time argument and a custom message $ sudo shutdown -r +10 "system upgrade" To cancel a scheduled shutdown $ sudo shutdown -c To cancel a scheduled shutdown, and to broadcast a message to all users $ sudo shutdown -c "reboot is cancelled" regards, T.Dhanasekar

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1D1C - showkey
by Dhanasekar 17 Feb '23

17 Feb '23

showkey - examine the codes sent by the keyboard To examine the codes sent by the keyboard $ sudo showkey To display print options $ sudo showkey -h To start showkey in scan code dump mode $ sudo showkey -s To start showkey in keycode dump mode $ sudo showkey -k To start showkey in `ascii‘ dump mode. $ sudo showkey -a regards, T.Dhanasekar

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1D1C - shuf
by Dhanasekar 16 Feb '23

16 Feb '23

shuf - writes a random permutation of the input lines to standard output shuf command without any option $ shuf 1 2 3 ctrl+d 3 1 2 $ cat file.txt msg1 msg2 msg3 msg4 msg5 msg6 To shuffle all the lines in the file $ shuf file.txt To add the number of lines to shuffle $ shuf -n 3 file.txt To make shuf as a range $ shuf -i 10-30 To get only one output from the randomized range $ shuf -i 10-100 -n 1 To shuffle a range and allow displaying three outputs which can be repetitive. $ shuf -i 10-100 -n 3 -r To use shuf as a List $ shuf -e a b c d $ shuf -e 1 2 3 4 To randomize a list and decide to only output two output lines $ shuf -e -n 2 1 2 3 4 $ shuf -e -n 2 a b c d To write output to a file $ shuf -i 10-20 -o file.txt $ cat file.txt regards, T.Dhanasekar

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1D1C - shred
by Dhanasekar 15 Feb '23

15 Feb '23

shred - overwrite a file to hide its contents, and optionally delete it syntax $ shred [filename] $ shred sample.txt To designate number of times to overwrite a file $ shred -n 2 example.txt To overwrite and delete a file $ shred -uv sample1.txt To selectively overwrite bytes of text $ shred -s [number_of_bytes] [filename] $ shred -s 10 password.txt To run shred with verbose mode $ shred -v file.txt To change permissions to allow writing if necessary $ shred -f [filename] $ shred -f file.txt To hide shredding from the file system. $ shred -z filename $ shred -z file.txt To Display shred Basic Details and Version and help options $ shred --version $ shred --help regards, T.Dhanasekar

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