'not found' error message when parsing Linux execution program

Title: Linux prompts not found when executing a program. Problem analysis and solutions

When using a Linux system, we often encounter the error message "not found" when executing a program. This problem is usually caused by the system being unable to find the required executable file. This article details the cause of this issue and provides specific code examples to resolve the issue.

1. Find the required executable file path

When we enter the name of an executable file in the terminal, the system will automatically set the path in the PATH (environment variable) Search each directory for an executable file matching the file name. So the first step is to make sure the executable exists in a directory in your PATH.

We can use the echo $PATH command to view the value of the current PATH environment variable. This command displays a list of paths in order, separated by colons.

If the required executable file path is not found in PATH, you need to add the path to the PATH environment variable. For example, we can add /usr/local/bin to PATH using the following command:

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

2. Check file permissions

In Linux, In order to execute a file, you need to give it execute permission. If the file does not have execution permission, a "not found" error will occur when executing.

We can use the ls -l command to view the file permissions. For example, the following is an example of permissions for an executable file my_program:

-rwxr-xr-x 1 user group 1234 Jan 1 10:00 my_program

In the above example, the file owner (user), user group (group) and other users have different permissions. permissions. Among them, r represents read permission, w represents write permission, and x represents execution permission.

If the file lacks execution permission, you can use the chmod command to modify the file permissions. For example, the following command will grant execution permissions to all users:

chmod +x my_program

3. Check whether the file exists in the correct location

If you get a "not found" error when executing the program, also Need to ensure that the file actually exists in the specified location. This is because in some cases the file may have been moved, deleted, or had its name changed.

We can use the ls command to check whether the file exists. For example, the following command will display all files and directories in the current directory:

ls

If the file does exist in the specified location, you should check that the file name is correct. Sometimes, we may enter the wrong file name, causing the system to be unable to find the required executable file.

4. Ensure that the libraries used are installed correctly

Some executables may depend on specific library files. "not found" errors can also occur when executing a program if the required library files are not installed correctly.

We can use the ldd command to view the library files that the executable file depends on. For example, the following command will display the library files that the executable my_program depends on:

ldd my_program

If a library file is missing, you will need to use a package manager to install the required library.

To sum up, when a "not found" error occurs when executing a program in Linux, we need to check the path of the executable file, file permissions, file existence, and the installation of dependent library files in order. By troubleshooting these possible causes one by one and taking appropriate repair actions as needed, we can resolve these types of issues so that the program can execute successfully.

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