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https://github.com/mboljen/howto

Collection of useful commands on a Debian system
https://github.com/mboljen/howto

bash commands debian

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Collection of useful commands on a Debian system

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README 

        
# Howto



## User administration



+ [Add an existing user to an existing group](01-users/01-add-existing-user-to-existing-group.md)

+ [Assign another primary group to an existing user](01-users/02-assign-another-primary-group-to-existing-user.md)

+ [Terminate all processes of a normal user](01-users/03-terminate-all-processes-of-a-normal-user.md)

+ [Change the UID of an existing user and the GID of an existing group](01-users/04-change-the-uid-of-an-existing-user-and-the-gid-of-an-existing-group.md)

+ [List all members of a Kerberos group](01-users/05-list-all-members-of-a-kerberos-group.md)

+ [Reset ACL permissions of an existing file structure](01-users/06-reset-acl-permissions-of-an-existing-file-structure.md)



## System administration



+ [Repair GRUB boot loader using Live USB Image](02-system/01-repair-grub-boot-loader-using-live-usb-image.md)

+ [Upgrade a running Debian system from stable to testing](02-system/02-upgrade-running-debian-system-from-stable-to-testing.md)

+ [Find package providing a specific file in software repository](02-system/03-find-package-providing-specific-file-in-software-repository.md)

+ [Monitor log messages of system service](02-system/04-monitor-log-messages-of-system-service.md)



## File system operations



+ [Change the label of a FAT file system](03-media/01-change-the-label-of-fat-file-system.md)

+ [Create an ISO image from an external media](03-media/02-create-iso-image-from-external-media.md)

+ [Create ISO image from folder](03-media/03-create-iso-image-from-folder.md)

+ [Mount ISO image](03-media/04-mount-iso-image.md)

+ [Record CD or DVD from ISO image](03-media/05-record-cd-or-dvd-from-iso-image.md)

+ [Create Live system on USB drive from ISO image](03-media/06-create-live-system-on-usb-drive-from-usb-image.md)

+ [Erase a rewritable CD+RW disk](03-media/07-erase-rewritable-cd+rw-disk.md)

+ [Format a rewritable DVD+RW disk](03-media/08-format-rewritable-dvd+rw-disk.md)

+ [Grep longest track on DVD disk](03-media/09-grep-longest-track-on-dvd-disk.md)

+ [Copy complete track of a DVD disk to a file](03-media/10-copy-complete-track-of-a-dvd-disk-to-a-file.md)



## Search operations



+ [Find all hard linked files in and below a directory](04-search/01-find-all-hard-linked-files-in-and-below-a-directory.md)

+ [Remove all duplicate files in and below a directory with hard links](04-search/02-remove-all-duplicate-files-in-and-below-a-directory-with-hard-links.md)

+ [Find all files and execute a certain command](04-search/03-find-all-files-and-execute-a-certain-command.md)

+ [Change all file extensions to lowercase characters](04-search/04-change-all-file-extensions-to-lowercase-letters.md)

+ [Find all files containing a specific text recursively](04-search/05-find-all-files-containing-a-specific-text-recursively.md)



## Audio file editing



+ [Convert MP3 file to ring tone for Apple iPhone](05-audio/01-convert-mp3-file-to-ring-tone-for-apple-iphone.md)

+ [Add cover art to all MP3 files in the current folder](05-audio/02-add-cover-art-to-all-mp3-files-in-the-current-folder.md)



## Photo editing



+ [Convert photos to PNG format](06-photo/01-convert-photos-to-png-format.md)

+ [Place logo in image file](06-photo/02-place-logo-in-an-image-file.md)

+ [Place text in image files](06-photo/03-place-text-in-image-files.md)

+ [Add or modify the original date and time of a JPEG image](06-photo/04-add-or-modify-the-original-date-and-time-of-a-jpeg-image.md)



## Video editing



+ [Concatenate multiple MTS video files](07-video/01-concatenate-multiple-mts-video-files.md)

+ [Convert Quicktime video to Matroska video](07-video/02-convert-quicktime-video-to-matroska-video.md)

+ [Concatenate multiple Matroska videos](07-video/03-concatenate-multiple-matroska-videos.md)

+ [Auto-detect black margins in a video](07-video/04-autodetect-black-margins-in-a-video.md)

+ [Crop video](07-video/05-crop-video.md)

+ [Convert video including all video and audio tracks to MP4 format](07-video/06-convert-video-including-all-video-and-audio-tracks-to-mp4-format.md)

+ [Create still at a certain time of a video file](07-video/07-create-still-at-a-certain-time-of-a-video-file.md)

+ [Extract a certain time range of an existing video](07-video/08-extract-a-certain-time-range-of-an-existing-video.md)

+ [Scale existing video maintaining the given aspect ratio](07-video/09-scale-existing-video-maintaining-the-given-aspect-ratio.md)

+ [Increase or decrease the speed of a video](07-video/10-increase-or-decrease-the-speed-of-a-video.md)

+ [Record screen sequence and save to video file](07-video/11-record-screen-sequence-and-save-video-file.md)

+ [Convert multiple PNG images to MP4 video](07-video/12-convert-multiple-png-images-to-mp4-video.md)

+ [Add a logo to a video file](07-video/13-add-a-logo-to-a-video-file.md)

+ [Create AVI video from PNG image files](07-video/14-convert-avi-video-from-png-image-files.md)

+ [Convert video to a Windows Media Video](07-video/15-convert-video-to-a-windows-media-video.md)



## PDF document editing



+ [Reduce the size of scanned PDF documents](08-documents/01-reduce-the-size-of-scanned-pdf-documents.md)

+ [Extract single pages of a PDF document](08-documents/02-extract-single-pages-of-a-pdf-document.md)

+ [Concatenate multiple PDF document to a single PDF document](08-documents/03-concatenate-multiple-pdf-documents-to-a-single-pdf-document.md)

+ [Rotate a PDF document](08-documents/04-rotate-a-pdf-document.md)

+ [Extend or reduce page margins of PDF documents](08-documents/05-extend-or-reduce-page-margins-of-pdf-documents.md)

+ [Scale PDF document to DIN A5](08-documents/06-scale-pdf-document-to-din-a5.md)

+ [Search for a text phrase in all PDF files of a certain directory](08-documents/07-search-for-a-text-phrase-in-all-pdf-documents-in-a-certain-directory.md)