To set environment variables in Linux, open the terminal and type the following command:

export VARIABLE_NAME=value

where VARIABLE_NAME is the name of the environment variable and value is the value to be assigned to it.

For example, if you want to set the environment variable PATH, you would type the following command:

export PATH=/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin

You can also use the command line to set multiple environment variables at once. To do so, you would type:

export VARIABLE_NAME_1=value_1 VARIABLE_NAME_2=value_2 VARIABLE_NAME_3=value_3

You can also set environment variables permanently in Linux by adding them to the .bashrc file in your home directory. To do so, open the .bashrc file in a text editor and add the following line:

export VARIABLE_NAME=value

1. Establish Your Network Requirements:
Before setting up a business network, you need to determine your exact requirements. Consider the size of the network, the number of users, the type of applications you will use and the type of hardware you will need.

2. Choose Your Hardware:
The hardware you choose will depend on your requirements. Consider the type of server, the type of router and switch, the type of firewall and the type of cabling you will need.

3. Install the Hardware:
Once you have chosen the hardware you need, you can start installing it. This may require specialized knowledge and experience, so consider hiring a professional to do the work for you.

4. Set Up Your Network:
Once all the hardware is installed, you can now set up the network. This includes configuring the server, the router, the switch, the firewall and the cabling.

5. Configure User Accounts and Permissions:
Once the hardware is set up and the network is running, you need to set up user accounts and configure user permissions. This includes defining user roles, granting access to files and applications and setting up passwords.

6. Install Network Applications:
Once the users are set up, install any network applications you need. This includes setting up email and collaboration tools, database applications and other business applications.

7. Monitor and Maintain the Network:
Once the network is up and running, you need to monitor it and make sure it is running optimally. This may include regular maintenance and software updates, as well as troubleshooting any issues that may arise.

1. Open the Task Manager.

2. Click the Performance tab.

3. Click the Open Files tab.

4. Select the User or Computer field to view all open files by user or computer.

5. Select the File Path field to view open files by location.

6. Select the User or Computer field to view open file sessions by user or computer.

7. Select the Activity field to view the process, application, or service associated with the open file session.

8. Select the Date/Time field to view the date and time when the open file session began.

To convert a number into binary, you can use the following steps:

1. Divide the number by two.
2. Get the integer quotient for the next iteration.
3. Get the remainder for the binary digit.
4. Repeat the steps until the quotient is equal to 0.
5. The binary digits obtained in the remainders will be in the reverse order of the actual binary number.

For example, if you want to convert the number 25 into binary, you can follow the steps given below.

Step 1: 25/2 = 12 (Quotient) 1 (Remainder)
Step 2: 12/2 = 6 (Quotient) 0 (Remainder)
Step 3: 6/2 = 3 (Quotient) 0 (Remainder)
Step 4: 3/2 = 1 (Quotient) 1 (Remainder)
Step 5: 1/2 = 0 (Quotient) 1 (Remainder)

Therefore, the binary representation of 25 is 11001.