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

1D1C - rdfind
by Dhanasekar 31 Aug '23

31 Aug '23

rdfind - finds duplicate files To install rdfind $ sudo apt install rdfind To find duplicate file in a directory testdir $ rdfind /home/venus/testdir it will create a results.txt file To print help options $ rdfind --help To delete duplicate files in a current directory $ rdfind -deleteduplicates true . regards, T.Dhanasekar

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1D1C - rmlint
by Dhanasekar 30 Aug '23

30 Aug '23

rmlint - find duplicate files and other space waste efficiently To find duplicate files in test dir $ pwd /home/venus/test create same content with 3 files test$ ls file1.txt file2.txt file3.txt $ rmlint /home/venus/test # Duplicate(s): ls '/home/venus/test/file1.txt' rm '/home/venus/test/file2.txt' rm '/home/venus/test/file3.txt' ==> Note: Please use the saved script below for removal, not the above output. ==> In total 3 files, whereof 2 are duplicates in 1 groups. ==> This equals 12 B of duplicates which could be removed. ==> Scanning took in total 0.146s. Wrote a sh file to: /home/venus/test/rmlint.sh Wrote a json file to: /home/venus/test/rmlint.json 2. To print help options $ rmlint --help 3. To open rmlint in GUI $ rmlint --gui /home/venus/test regards, T.Dhanasekar

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1D1D - fdupes
by Dhanasekar 29 Aug '23

29 Aug '23

fdupes - finds duplicate files in a given set of directories create file1.txt $ cat file1.txt i love linux i love python create file2.txt with same content as file1.txt $ cat file2.txt i love linux i love python To find duplicate contents with different file names in the current directory $ fdupes . To search for duplicates recursively under every directory $ fdupes -r /home To find the size of duplicates in the current dir $ fdupes -S . To find duplicates in more than one directory $ fdupes /home/<username>/Downloads /home/<username>/Documents To display a summary of all information related to duplicate files in the current directory $ fdupes -m . $ cat filea.txt hello $ cat fileb.txt hello $ cat filec.txt hello To remove duplicate files in the current directory $ fdupes -d . Set 1 of 1: 1 [ ] ./filea.txt 2 [ ] ./fileb.txt 3 [ ] ./filec.txt if we want to keep file 2 and delete 1 and 3 ( Preserve files [1 - 3, all, help] )=2 then ( Preserve files [1 - 3, all, help] ): prune and hit ENTER ( No duplicates remaining; type 'exit' to exit program ):exit To preserve the first instance of a file in every set of duplicate files and want to ignore the prompt $ fdupes -d -N . To display help options $ fdupes --help regards, T.Dhanasekar

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1D1C - sshpass
by Dhanasekar 28 Aug '23

28 Aug '23

sshpass - noninteractive ssh password provider To install sshpass $ sudo apt-get install sshpass To pass ssh passwords from a file .secret to ssh login $ echo 'myPassword' > .ssh_secrets $ chmod 0400 .secrets $ sshpass -f ".ssh_secrets" ssh user@remote_server_ip To pass ssh password direct to ssh login $ sshpass -p 'ssh_server_password' ssh username@remote_server_ip To make backup of all databases without password $ sshpass -f ".db_secrets" mysqldump -u root -p --all-databases > all-databases_`date +"%Y-%B-%d_%R"`.sql To make backup using rsync $ sshpass -f ".ssh_secrets" rsync -a backup/ user_name@remote_server_ip :/home/test/backup regards, T.Dhanasekar

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1D1C - identify
by Dhanasekar 27 Aug '23

27 Aug '23

identify - describes the format and characteristics of one or more image files. To get the details of images $ identify pic1.jpg $ identify pic2.jpeg $ identify pic3.png regards, T.Dhanasekar

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1D1C - at , atq , atrm
by Dhanasekar 26 Aug '23

26 Aug '23

at, batch, atq, atrm - queue, examine, or delete jobs for later execution To execute a command at 13.00 hours $ at 13.00 at> df -Th > df.txt at> CTRL+D The command $ df -Th will executed and stored in df.txt at 13.00 hours To list the jobs in queue with job numbers $ atq To cancel the jobs in queue $ atrm <job_number> To execute a command at 14.00 hours $ at 14.00 at> free -h > free.txt at> CTRL+D The command $ free -h will executed and stored in free.txt at 14.00 hours check with $ atq regards, T.Dhanasekar

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1D1C - mkvmerge
by Dhanasekar 25 Aug '23

25 Aug '23

mkvmerge - Merge multimedia streams into a Matroska file To install mkvmerge $ sudo apt install mkvtoolnix mkvtoolnix-gui To merge multiple .mkv files $ mkvmerge -o output.mkv input1.mkv +input2.mkv +input3.mkv To increase verbosity $ mkvmerge -o --verbose output.mkv input1.mkv +input2.mkv +input3.mkv To suppress status output $ mkvmerge -o -q output.mkv input1.mkv +input2.mkv +input3.mkv To get help info $ mkvmerge --help regards, T.Dhanasekar

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1D1C - zip
by Dhanasekar 24 Aug '23

24 Aug '23

zip - package and compress (archive) files To install zip $ sudo apt install zip To zip a single file file1.txt $ zip file1.zip file1.txt To zip multiple files $ zip file.zip file1.txt file2.txt file3.txt file4.txt To zip files based on wildcard $ zip txt_file,zip *.txt $ zip mp3_file.zip *.mp3 $ zip jpg_file.zip *.jpg To zip a file to a different directory $ zip /path/to/dir/file.zip file1.txt file2.txt file3.txt To add a file to a existing zip file $ zip -u file.zip file5.txt To remove a file from an already existing zip file $ zip -d files.zip file5.txt To delete the original files after creating the zipped file $ zip -m file.zip file1.txt file2.txt file3.txt To zip directories $ zip -r mydir.zip dir1/ To set the level of compression compression ranges from 0 to 9 level default is 6 files with compression value 9 is less in file as compared to compression value 0 To compress a file using compression value 9 $ zip -9 files9.zip *.txt To compress a file using compression value 0 $ zip -0 file0.zip *.txt To create password-protected zip files $ zip -e files.zip *.txt To set a password to a zip file at any time $ zipcloak file.zip To display details about the zipped file $ zipdetails file.zip To search files inside the zip file file.zip the word ipaddress $ zipgrep ipaddress file.zip To display information about the zip file $ zipinfo file.zip To split the zip file $ zipsplit -n <size> test.zip <size> is the maximum size for the split files To get help info $ zip --help regards, T.Dhanasekar

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1D1C - htop
by Dhanasekar 23 Aug '23

23 Aug '23

htop - interactive process viewer To install htop $ sudo apt instal htop To display all linux processes $ htop To filter by CPU , MEM usage , PID $ htop press F6 UP/DOWN key to select the choice to filter To search for a process by name $ htop press F3 type process name regards, T.Dhanasekar

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1D1C - top
by Dhanasekar 22 Aug '23

22 Aug '23

top - display Linux processes To list all running linux processes $ top To show processes by specific user $ top -u <username> To display the running process in color $ top press z To display the absolute path of the running process $ top press c To set desired interval time to refresh top command $ top press d set from default time 3.0 to any value in seconds ex. Change delay from 3.0 to 5.0 To kill a running process without closing the top window $ top press k find the process to be killed and enter the pid value and enter To display all running processes by CPU utilization $ top press SHIFT+ P To change the priority of the process $ top press r give the pid of process where we need to change the priority then give priority value To list the load information of your CPU cores $ top press 1 To display the list of idle/sleeping processes $ top press i To print specific number of refresh outputs of top command $ top -n <value> $ top -n 5 $ top -n 3 regards, T.Dhanasekar

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ILUG-D August 2023