Installation / Upgrade

Linux Terminal Commands

In this article we will learn commonly used terminal commands for linux.

Having some familiarity with these commands will help you in manage a linux based server. Which will help you understand how to host your services on cloud.

Prerequisite Knowledge

To understand this guide you dont need to be an expert but having some basic familiarity with linux will help you.

Let us begin the step by step guide to learn systemctl commands

Access a remote computer

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    ssh root@0.0.0.0

If you want to access and login to a remote system you need to use SSH command. You have to provide a username and Ip address of the service. After you hit enter it will ask your user password. When you enter correct password. You can access a remote system.

Unzip a zip file

If the unzip command isn’t already installed on your system, then run: 

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    sudo apt-get install unzip

After installing the unzip utility, if you want to extract to a particular destination folder, you can use: 

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    unzip file.zip -d destination_folder

Download a File from internet

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    wget [File-URL]

This command downloads the file with the given link

Print working directory

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    pwd

see the full path of current directory

Show hidden files

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    ls -a

Normal ls command will not show you hidden files. Use this command to see hidden files.

Show Files with their file Size

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    ls -lh

Move files from one folder to another and Rename files 

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    mv /path_to_source_folder/filename /path_to_destination_folder/

This commands moves file from one folder to another folder. It is also used for renaming files. When you want to rename a file make sure the source path and destination path is same.

See disk folder data usage

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    du -hs /path/to/directory

Copy files and directory

scp command is used to copy files from one system to another system. 

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    scp -r root@139.59.79.32:/local/storage/directory /home/user/localfolder

Copy directory from local storage to Server

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    scp -r /path/to/jar/filename.jar root@0.0.0.0:/nearbyshops

Copies files in directory of local server to remote server with ip and path on remote server

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    scp -r /path/to/my/files root@0.0.0.0:/path/on/remote/system

See a log

Just use the journalctl command, as in:

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    journalctl -u service-name.service

See the most recent logs ... logs sorted in reverse with recent logs appearing first:

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    journalctl -u service-name.service -r

Or, to see only log messages for the current boot:

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    journalctl -u service-name.service -b

You can omit the .service prefix and it will just be fine

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    journalctl -u service-name

SystemD

See full log using systemD

https://unix.stackexchange.com/questions/225401/how-to-see-full-log-from-systemctl-status-service