Linux Learning

[DevShivmohan]

Reseting Network Manager command

• sudo NetworkManager reset

Having the wireless card engage into monitor mode--

• Type iwconfig command now you have see the managed mode and also default value is managed.
• Type sudo airmon-ng check kill then kill the network interface card
• Type sudo airmon-ng start wlp1s0 interface in monitor mode.
• Type sudo iwconfig to verify.

To revert interface in managed mode--

• Type sudo airmon-ng stop wlp1s0mon and it will be in managed mode.

Deauth packets in LAN network--

• Type airodump-ng wlp1s0mon to scan all networks.
• Type airodump-ng --bssid [BSSID] --channel [CH] wlp1s0mon where BSSID is targeted and CH are channel no.
• Type aireplay-ng -0 0 -a [BSSID] -c [STATION] wlp1s0mon where STATION are single client Mac address, this attack applicable for single client.
• Type aireplay-ng -0 0 -a [BSSID] wlp1s0mon this is applicable for all clients.

[DevShivmohan]

To show recently used commands in LINUX

• Type command - history .
• Its show's all the used commands recently.

[DevShivmohan]

To delete specific line from recently used history in Linux

• Specific line.
  • Type command - history -d <line number>;
• Entire content.
  • Type command - history -c;

[DevShivmohan]

Zip/Unzip files

• Zip files
  • Syntax zip zip_file_name_without_extension file1 file2 file3......
  • Example zip SpectrumBackend Spectrum_Backend.jar info.txt *.class
• Unzip file
  • Syntax unzip unzip_file_name_with_extension
  • Example unzip SpectrumBackend.zip

[DevShivmohan]

OS [Linux] file permissions

• When execute command ls -l
• Looks like this.
• .
• Descriptions of the permissions.
• 
• 

Change permission of a directory/file

• Syntax chmod <permission> directory/file
• i.e. chmod 777 spectrum-backend

Change ownership of a directory/file

• Syntax sudo chown <user_name> directory/file
• i.e. sudo chown root spectrum-backend
• If want to see the changed permission then type ls -l then shows

[DevShivmohan]

For Linux dir/file permissions refer - Link

[DevShivmohan]

Configure Java in Linux

• Type command update-alternatives --config java and then type selection number and then press enter.
• Install java 17 LTS sudo apt install openjdk-17-jdk openjdk-17-jre for more Refer

[DevShivmohan]

Format bootable pendrive in linux

• Type df command, The terminal prints out a list of all mounted partitions and relevant information: used space, available space, used space percentage, and the path. Locate the USB in the list and find the corresponding device. In this example, the USB drive is /dev/sdb1.
• Unmount the USB drives before formatting. To do so, run this command: sudo umount /dev/sdb1.
• After unmounting, format the USB drive using the preferred file system (replace sdb1 with the name of your device).
  • To format a USB drive with FAT32 file system, use. sudo mkfs.vfat /dev/sdb1.
  • To format a USB drive using the NTFS file system run. sudo mkfs.ntfs /dev/sdb1.
  • To format a USB drive in accordance with the exFAT file system use. sudo mkfs.exfat /dev/sdb1.
• Confirm the formatting process has completed successfully. sudo fsck /dev/sdb1.
• .
• A USB drive with no files indicates successful formatting.
• Now Pendrive has successfully formatted.
• For more information please refer this Link.

[DevShivmohan]

Set installed software path in environment variable Ubuntu

For example I'm setting Gradle path

• Open Terminal: Open a terminal on your Ubuntu system.
• Edit .bashrc File: You can set the Gradle path by adding it to your shell's configuration file, such as .bashrc. Open the .bashrc file using a text editor like nano or vim.
• Type the command nano ~/.bashrc.
• Add Gradle Path: Scroll to the end of the .bashrc file and add the following line, replacing /path/to/gradle with the actual path to your Gradle installation directory:
• Syntax export PATH=$PATH:/path/to/gradle/bin.
• Example export PATH=$PATH:/opt/gradle/gradle-8.3/bin This is in our system, in case your may be different.
• Reload the .bashrc file by typing the command source ~/.bashrc.
• Now everything is done you can access your software via terminal.

[DevShivmohan]

Set timezone in UTC on ubuntu