How to run an executable in Linux?

Running Executables in Linux: A Comprehensive Guide

Introduction

Running executables in Linux is a fundamental aspect of operating system administration. Executables are programs that can be run directly from the command line, and Linux provides a variety of tools and techniques for managing and executing these programs. In this article, we will cover the basics of running executables in Linux, including how to create and manage executables, how to run executables, and how to troubleshoot common issues.

Creating Executables in Linux

To create an executable in Linux, you will need to use a command-line tool such as gcc or make. Here are the steps to create a simple executable:

• Using gcc: The gcc command is used to compile C and C++ programs into object files, which can then be linked together to create an executable.
• Example: gcc -o hello hello.c
• Using make: The make command is used to build and install software packages. It can also be used to create executables.
• Example: make hello

Managing Executables in Linux

Once you have created an executable, you can manage it using various tools and techniques. Here are some of the most common methods:

• Running an Executable: To run an executable, simply type its name followed by the command to execute it.
• Using ./: To run an executable, you can use the ./ command followed by the name of the executable.
• Using ./<executable>: To run an executable with arguments, you can use the ./<executable> syntax.

Troubleshooting Common Issues

Here are some common issues that you may encounter when running executables in Linux, along with solutions:

• No executable found: This error occurs when the gcc or make command is not found on the system.

  • Solution: Check that the gcc or make command is installed and available on the system.

• Executable not found: This error occurs when the executable is not found in the system’s PATH.

  • Solution: Check the system’s PATH and add the executable’s directory to it.

• Executable not running: This error occurs when the executable is not running correctly.

  • Solution: Check the executable’s permissions and ensure that it has execute permissions.

Using chmod and chown

To manage the permissions and ownership of executables, you can use the chmod and chown commands.

• Using chmod: The chmod command is used to change the permissions of a file or directory.
• Example: chmod 755 hello
• Using chown: The chown command is used to change the ownership of a file or directory.
• Example: chown root:root hello

Using sudo

To run an executable with elevated privileges, you can use the sudo command.

• Using sudo: The sudo command is used to run a command with elevated privileges.
• Example: sudo ./hello

Using systemd

To manage the execution of executables using systemd, you can use the systemctl command.

• Using systemctl: The systemctl command is used to manage the execution of executables using systemd.
• Example: systemctl start hello

Conclusion

Running executables in Linux is a fundamental aspect of operating system administration. By following the steps outlined in this article, you can create and manage executables, troubleshoot common issues, and use various tools and techniques to manage the execution of executables. Whether you are a beginner or an experienced administrator, this guide provides a comprehensive overview of the basics of running executables in Linux.

Table: Common Executable Commands

Command	Description
gcc	Compile C and C++ programs into object files
make	Build and install software packages
./hello	Run the hello executable
./hello <arguments>	Run the hello executable with arguments
chmod 755 hello	Change the permissions of the hello executable
chown root:root hello	Change the ownership of the hello executable
sudo ./hello	Run the hello executable with elevated privileges
systemctl start hello	Start the hello service using systemd