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Which is the zeroth argument in Bash command?
Pass the string name as the zeroth argument to command. This option is available in bash versions 4.2 and above. When used, it will execute command, and set the special shell variable $0 to the value name, instead of command.
What happens when an exec command is not executed?
The -c option causes command to be executed with an empty environment. If -a is supplied, the shell passes name as the zeroth argument to the executed command. If command cannot be executed for some reason, a non-interactive shell exits, unless the execfail shell option is enabled. In that case, it returns failure.
What are the arguments for Bash exec builtin?
Options and arguments. The exec builtin command takes the following options and arguments: -a name. Pass the string name as the zeroth argument to command. This option is available in bash versions 4.2 and above. When used, it will execute command, and set the special shell variable $0 to the value name, instead of command.
When to use Exec to replace a shell?
exec [-cl] [-a name] [command [arguments]] If command is specified, it replaces the shell. No new process is created. The arguments become the arguments to command. If the -l option is supplied, the shell places a dash at the beginning of the zeroth argument passed to command.
How to use exec with a command as an argument?
Exec with a command as an argument: In the first mode, the exec tries to execute it as a command passing the remaining arguments, if any, to that command and managing the redirections, if any. Example 1: Example 2: The exec command searches the path mentioned in the $PATH variable to find a command to be executed.
What happens if there is no command in Exec?
The command to be executed. If you do not specify a command, exec can still provide redirection. The arguments for the command you’d like to execute. Any redirection for the command. If no command is specified, redirection applies to the current shell.