exec command is a Linux command that is used to execute a command in the current process. When
exec is used, the current process is replaced with a new process that is created by executing the specified command. This means that the new process inherits the environment variables, file descriptors, and current working directory of the calling process.
exec command is used to execute a command in the current process. The syntax for the
exec command is as follows:
exec command [arguments]
command argument specifies the command to be executed, and the optional
arguments argument specifies any arguments to be passed to the command.
For example, to run the
ls command using
exec, you would enter the following command:
This would replace the current process with a new process that runs the
- Replacing the current shell with a new program:
execcan be used to replace the current shell with a new program. For example, if you want to replace the current shell with the
vitext editor, you would enter the following command:
- Running a command with elevated privileges:
execcan be used to run a command with elevated privileges. For example, if you want to run the
passwdcommand with elevated privileges, you would enter the following command:
exec sudo passwd.
- Running a command in the background:
execcan be used to run a command in the background. For example, to run the
topcommand in the background, you would enter the following command:
exec top &.
The following table lists the available options for the
||Clear the environment before executing the command.|
||Exit the shell if the command cannot be executed.|
||Place a dash (
||Do not read the
||Run the command as the specified user.|
- If you receive an error message that says “command not found”, make sure that the command is installed on your system and that it is in your
- If you receive an error message that says “permission denied”, make sure that you have permission to execute the command. You may need to run the command with elevated privileges using
execcommand is often used in shell scripts to replace the current shell with a new program. This can be useful for running commands that require elevated privileges or for running commands in the background.
- When using
execto run a command with elevated privileges, it is important to be careful and only run commands that you trust. Running arbitrary commands with elevated privileges can be dangerous and can potentially harm your system.