List of Pre-Installed Tools

This is a curated list of utility tools that are pre-installed on all Ultra.cc servers, and therefore accessible to any user who connects to their slot terminal via Secure Shell (SSH).

This list will include a wide variety of utility tools with several use cases. Some are included in the default linux build, while others are pre-installed by staff as a complement to the official applications provided with your Ultra.cc slot.

Many of the tools will have a usage manual available by using man. For example, you can execute man curl, and you will see the usage manual for curl.

7z

7-Zip is a file archiver with a high compression ratio. It supports 7z (LZMA compression algorithm), ZIP, CAB, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format.

Below you will find two 7z usage examples.

List contents of archive: 7z l name-of-archive.7z
Extract contents of archive: 7z x name-of-archive.7z

For detailed usage instructions, follow this link.

aria2c

aria2c is a lightweight multi-protocol CLI download utility tool. Supported protocols are HTTP(S), FTP/SFTP, BitTorrent, and MetaLink.

Download torrent file and data: aria2c https://releases.ubuntu.com/22.04/ubuntu-22.04.2-desktop-amd64.iso.torrent
Limit Download speed: aria2c --max-download-limit=10M https://releases.ubuntu.com/22.04.2/ubuntu-22.04.2-desktop-amd64.iso
Download URLs from a text file: aria2c -i multiurl.txt

For detailed usage instructions, follow this link.

cat

Cat (concatenate) is a very useful tool that can output the contents of a file into your terminal, copy content to another file and a lot more.

Output file contents in your terminal: cat filename.txt
Copy content of file to another file: cat filename1.txt > filename2.txt

For detailed usage instructions, follow this link.

crontab

The crontab tool is useful for when you want to automate certain commands and execute them according to a schedule. It's available in most Linux distros by default and is can be accessed by executing crontab -e.

The scheduling format expressions can look daunting at first glance, but it is easily managed with crontab.guru.

Schedule a script to execute 1AM on Monday's: 0 1 * * 1 /home/user/path/to/script.sh

To disable Email being sent to the user account executing the cronjob, you can append > /dev/null 2>&1 to the crontab entry. The above would then be entered like this: 0 1 * * 1 /home/user/path/to/script.sh > /dev/null 2>&1

For detailed usage instructions, follow this link.

curl

curl is a tool to transfer data from or to a server. Supported protocols are HTTP(S), FTP(S)/SFTP, SCP, TFTP, DICT, TELNET, LDAP and FILE. This utility tool is highly flexible and preferred for automation since it is designed to work without user interaction.

Output content of a URL in the terminal: curl https://ultra.cc
Download and rename a file: curl -o hello.zip ftp://example.ftp.net/example.zip

For detailed usage instructions, follow this link

fdupes

fdupes is a utility tool that lets you search and find duplicate files in a given set of directories of your choice. It will compare file sizes and MD5 signatures, followed by a byte-by-byte comparison.

Recursively search and show duplicates in terminal: fdupes -Sr /path/to/directory
Recursively search and output duplicates in file: fdupes -SR /path/to/directory > /path/to/file.txt

For detailed usage instructions, follow this link

ffmpeg

FFmpeg is a video converter capable of encoding and decoding all kinds of video formats. It is a feature rich utility tool that can record, convert and stream audio and video.

Display information of media file: ffmpeg -i video.mkv
Convert media file: ffmpeg -i video_input.mkv video_output.mp4

For detailed usage instructions, follow this link

ffprobe

FFprobe gathers information from multimedia streams and outputs in a human-readable fashion. For example, it can be used to check the format of the container used by a multimedia stream and the format and type of each media stream contained in it.

Show media file information: ffprobe video.mp4
Inspect video stream: ffprobe -hide_banner -v panic -select_streams v:0 -show_entries stream=bit_rate video.mp4

For detailed usage instructions, follow this link

flac

flac is a command-line utility tool for encoding, decoding, testing and analyzing FLAC and other audio streams.

Encode WAV to FLAC: flac filename.wav

For detailed usage instructions, follow this link

Htop

Htop is an interactive process viewer for the Linux terminal, it's a highly useful utility tool as it will let you see all the processes running on the system. It is the equivalent to the task manager on Windows.

It can be accessed from the terminal by executing htop. Once Htop is open, you can use the mouse or arrow keys to navigate the process list. Shortcuts can be found on the F-row.

Setup and configure: F2
Tree view: F5
Kill process: F9
Exit: F10

For detailed usage instructions, follow this link

iostat

The iostat utility tool is used to show input/output statistics for devices, partitions and network filesystems (NFS). Within the Ultra.cc environment it is most commonly used to monitor the disk IO usage.

Show your disk's IO usage: iostat -xk 2 $(findmnt -T ~ | awk 'END {print $2}')

For detailed usage instructions, follow this link

LFTP

LFTP is a feature rich CLI FTP client that often is favored for its ability to handle multi-segmented transfers. Supported protocols are FTP(S), SFTP, HTTP(S), HFTP, FISH and FILE. It is also able to handle BitTorrent, though it is not recommended as there are better solutions for that.

A detailed setup guide can be found here.

Connect to a server: lftp sftp://username@servername.usbx.me
Download file in 5 segments: pget -n 5 ubuntu.iso
Download folder in 5 segments: mirror --use-pget-n=5 NameOfDirectory

For detailed usage instructions, follow this link

man

The Linux man utility tool is possibly one of the most important tools. The name man is a shortened version of manual pages and it holds the usage manual for basically all the usual Linux build tools and commands.

To access the usage manual, simply execute man <name-of-tool>. For example, should you want to read the usage manual for Htop, you can execute man htop. Once inside the usage manual, press h for help and q to quit.

Access usage manual for man: man man
Search within a usage manual: /<keyword>. For example, to search for the word get, type /get and press ENTER.
Repeat previous search forward: Press n to search previous word forward.
Repeat previous search backwards: Press N to search previous word backwards.

For detailed usage instructions, follow this link

md5sum

The md5sum utility tool is designed to verify data integrity using the MD5 algorithm. This tool is useful if you have downloaded a file and want to make sure it is the correct file, and not some malicious virus that can corrupt your system.

Store MD5 checksum in file: md5sum /path/to/file.iso > checksum.md5
Verify checksum of file: md5sum -c checksum.md5

For detailed usage instructions, follow this link

mediainfo

MediaInfo supplies technical and tag information about a video or audio file. Information can be viewed and exported in different formats, such as text, CSV and HTML.

Display media file information: mediainfo video.mkv
Display media file information with HTML tags: mediainfo --Output=HTML video.mkv

For detailed usage instructions, follow this link

metaflac

The metaflac utility tool can list, add, remove, or edit metadata in one or more FLAC files.

Show MD5 signature of file: metaflac --show-md5sum file1.flac
Remove tags from multiple files: metaflac --remove-tag=DESCRIPTION --remove-tag=COMMENT file1.flac file2.flac file3.flac

For detailed usage instructions, follow this link

mktorrent

The mktorrent utility tool is used to create BitTorrent metainfo files used by trackers and torrent clients. It can create metainfo files for single files or complete directories.

Set private flag: mktorrent -p filename.torrent
Add comment to metainfo: mktorrent -c <add-comment-here> filename.torrent

For detailed usage instructions, follow this link

mkvtoolnix-gui

mkvtoolnix-gui is a set of utility tools used to create, alter and inspect Matroska (MKV) files. This toolset is very useful for those who create encodes or need to extract information from media files.

As your Ultra.cc slot doesn't have access to an X server, the mkvtoolnix-gui cannot be used. However, the utility tools that are included can be used from a terminal. See below for more information about the individual tools.

mkvextract

mkvextract is included in mkvtoolnix-gui, and as the name suggests, this utility tool can extract tracks from Matroska (MKV) media containers. At the time of writing this, it can extract tracks, tags, attachments, chapters, CUE sheets and timecodes.

Extract tracks: mkvextract tracks source.mkv --raw 1:destination.raw
Extract tags into a XML file: mkvextract tags source.mkv > tags.xml

For detailed usage instructions, follow this link

mkvinfo

The mkvinfo utility tool can be used to print information about elements in Matroska (MKV) files. The output can be limited to a list of tracks in the file, including information about the codecs used.

Save info to file: mkvinfo -v media.mkv -r info.txt

For detailed usage instructions, follow this link

mkvmerge

The mkvmerge utility tool can be used to merge streams from several media files into a Matroska (MKV) file.

Merge two media files into one: mkvmerge -o full.mkv file1.mkv + file2.mkv

For detailed usage instructions, follow this link

mkvpropedit

The mkvpropedit utility tool can be used to modify properties of Matroska (MKV) files without having to do a complete remux.

Name specific track: mkvpropedit media.mkv --edit track:a2 --set name=Comments

For detailed usage instructions, follow this link

ncdu

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The NCurses Disk Usage, or the more common shortened version ncdu, is a utility tool that is based on the more basic du. It provides a fast way to see what files and directories are using your disk space.

We have written a guide ~~exists)~~with basic usage instructions, and it can be found here.

Scan and show file tree: ncdu -x

For detailed usage instructions, follow this link

pidstat

The pidstat utility tool is used for monitoring individual tasks that are being managed by the kernel. It can also be used to monitor child processes of selected tasks.

Show disk IO per process: pidstat -dl 2

For detailed usage instructions, follow this link

pip

This is not so much a utility tool, but more of a package manager for Python packages. Python is a very versatile language and with pip you have access to a lot of Python packages.

Install Python package: pip install <package-name>

Install Python 3 package: pip3 install <package-name>

List installed packages: pip list

For detailed usage instructions, follow this link

pwd

This utility tool was made with one goal in mind, to print the name of the current/working directory.

Show absolute path without symlinks: pwd -P

Show absolute path with symlinks: pwd -L

For detailed usage instructions, follow this link

rsync

The rsync utility tool is a fast and versatile file-copying tool that can handle both local and remote connections. It is one of the most popular file-copying tools and praised for its ease of use and stability.

Initial Setup

Rsync Backup Script

For detailed usage instructions, follow this link

screen

The screen utility tool is a window manager that multiplexes a physical terminal between several processes. This is very useful when you are handling SSH connections as they will be dropped and close when you exit the session. With screen you can set up a virtual terminal within the remote machine you have connected to via SSH.

Once the screen session is set up, you can then detach from the screen session and close your SSH connection. The screen session will continue to run while you are disconnected. This allows you to reconnect to your remote machine at a later point in time, and then reattach to the screen session to continue working where you left off.

Reattach if possible, otherwise start a new session: screen -R <session-name>

Detach from session: Press CTRL + a and then d

For detailed usage instructions, follow this link

systemctl

This is not so much a utility tool, but more of a system tool. But, as it is present in most Linux distros and used to manage services on your Ultra.cc slot, we decided to include it on the list. Below we will use nginx.service as an example, but this can be replaced with other services.

Show status of systemd service: systemctl --user status nginx.service

Stop systemd service: systemctl --user stop nginx.service

Start systemd service: systemctl --user start nginx.service

Restart systemd service: systemctl --user restart nginx.service

Reload systemd daemon: systemctl --user daemon-reload

For detailed usage instructions, follow this link

tail

The tail utility tool lets you "tail" the latest output of a file. This is useful for when you have a log file that is updating in real-time and you only want to see the latest output of the log file.

Show output of log file in real-time: tail -f filename.log

Show 50 last lines of a file: tail -n 50 filename.txt

For detailed usage instructions, follow this link

tar

The tar utility tool is a simple archiving tool used to save multiple files together into a single file archive. This is useful for when you need to transfer a lot of files as you can archive them all and then restore them once you have transferred the single archived tar file.

Create file archive: tar -cf archive.tar file1 file2

List all files in archive: tar -tvf archive.tar

Extract all files from archive: tar -xvf archive.tar

For detailed usage instructions, follow this link

tmux

The tmux utility tool is a terminal multiplexer and it enables a number of terminals to be created, accessed, and controlled from a single screen. tmux may be detached from a screen and continue running in the background, then later reattached.

When tmux is started it creates a new session with a single window and displays it on screen. A status line at the bottom of the screen shows information on the current session and is used to enter interactive commands.

This utility tool is very useful when you are handling SSH connections as they will be dropped and close when you exit the session. With tmux you can set up a virtual terminal within the remote machine you have connected to via SSH.

Once the tmux session is set up, you can then detach from the tmux session and close your SSH connection. The tmux session will continue to run while you are disconnected. This allows you to reconnect to your remote machine at a later point in time, and then reattach to the tmux session to continue working where you left off. Should you need a tmux cheatsheet, you can find it here.

Create tmux session: tmux new -s <session-name>

Attach to a session: tmux attach -t <session-name>

List sessions: tmux ls

New session window: Press CTRL + b and then c

New vertical pane: Press CTRL + b and then %

New horizontal pane: Press CTRL + b and then "

Close pane: Press CTRL + b and then x

Detach from session: Press CTRL + b and then d

For detailed usage instructions, follow this link

tree

The tree utility tool is a simple yet effective tool. It is used to list contents of a directory in a tree-like format.

List content recursively, hidden files included: tree -a

List only directories: tree -d

List content with full path prefix: tree -f

For detailed usage instructions, follow this link

unzip

As the name suggests, the unzip utility tool can list, test and extract compressed files in a ZIP archive. This tool work in conjunction with the utility tool called zip, which you can read about here.

List of Pre-Installed Tools

7z

aria2c

cat

crontab

curl

fdupes

ffmpeg

ffprobe

flac

Htop

iostat

LFTP

man

md5sum

mediainfo

metaflac

mktorrent

mkvtoolnix-gui

mkvextract

mkvinfo

mkvmerge

mkvpropedit

ncdu

pidstat

pip

pwd

rsync

screen

systemctl

tail

tar

tmux

tree

unzip

unrar

wget

which

zip