Dev {Tricks}

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How to check your Linux version?

Easy ways to view the distribution and version number of Linux OS.

Distribution version number

cat /etc/*release

For OS release details

cat /etc/os-release

For name and version number of your current distribution

lsb_release -d

To show additional information of current distribution version

lsb_release -a

Linux kernel version number

To shows the version of the Linux kernel that you’re currently using.

uname -r

For more information

uname -a

View everything at once

You have to install Inxi for this

apt-get -y install inxi

Once installed, you can view hardware, host, Linux kernel, desktop environment, and distribution with this simple command:

Inxi -Sz

 

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Move files in the Linux terminal

The mv command moves file(s) from one location to another.

To move a file from one directory to another with mv, remember the syntax below

mv <source> <destination>

For example,

mv example.zip /home

Check whether, it moves example.zip

ls /home

Rename the file as you move it

mv example.zip /home/newexample.zip

Rename a file without moving it to another location

mv example.zip renameexample.zip

Moving a directory

mv exampledir /home

Moving a file safely

mv --interactive example.zip /home

This will ask

mv: overwrite '/home/example.zip'?

If you do not want to manually intervene, use –no-clobber or -n instead.

mv --no-clobber example.zip /home

 

 

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How to disable functions using the PHP disable_functions directive in php ini

  • PHP disable_functions Executable Handling

The disable_function is used to stop certain dangerous PHP functions from executing.

Example of disable_function.

disable_functions = "exec, system"

Use the disable_functions directive in php.ini file to disable specific functions.
At least disable exec(), shell_exec() and system(). (If using WordPress).

disable_functions = "exec, passthru, shell_exec, system, proc_open, popen, curl_exec, curl_multi_exec, parse_ini_file, show_source"

 

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How to Install Zip/Unzip

How to Install Zip/Unzip in Debian/Ubuntu/Mint

apt install zip
apt install unzip

How to Install Zip/Unzip in RedHa/CentOS/Fedora

dnf install zip
dnf install unzip

How to Install Zip/Unzip in Arch/Manjaro Linux

pacman -S zip
pacman -S unzip

How to Install Zip/Unzip in OpenSUSE

zypper install zip
zypper install unzip

 

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How to change Time Zone in Debian 11 / Debian 10

  • Changing Time Zone in Debian 11 / Debian 10

We can do the change timezone in two ways,

  1. Using /etc/localtime file
  2. Using timedatectl command

1. Using /etc/localtime File

Check current timezone

date

The /etc/localtime is a link to the original timezone file. Check the symbolic link using the following command.

ls -al /etc/localtime

Output

lrwxrwxrwx 1 root root 32 Oct 8 13:58 /etc/localtime -> ../usr/share/zoneinfo/Asia/Dhaka

The /usr/share/zoneinfo/ directory contains all the timezones.

You can check your zone info. For example, America, Chicago, Los_Angeles, Dhaka etc

ls /usr/share/zoneinfo/America/

Now, create a link with the desired timezone file. America/Chicago

ln -sf /usr/share/zoneinfo/America/Chicago /etc/localtime

Verify the timezone using the date command.

date

That’s All.

2. Using timedatectl command

Check current timezone

date

Use the following command to list all time zones.

timedatectl list-timezones

You can filter the output with the city nearer to you.

timedatectl list-timezones | grep -i Los_Angeles

Set the timezone using the following command.

timedatectl set-timezone America/Los_Angeles

Verify the timezone using the date command.

date

That’s All.