Which of the following commands adds the directory /new/dir to the PATH environment variable?
export PATH=/new/dir:$PATH
This command correctly adds the directory /new/dir to the PATH environment variable while ensuring that this change is available to any child processes initiated from the current shell session. The 'export' command is essential for making the updated PATH accessible system-wide.
This command attempts to modify the PATH variable but lacks the 'export' keyword, which is necessary for the changes to be recognized by child processes. Additionally, the use of the dollar sign ($) before PATH is incorrect, as it should not be included when assigning a value.
Similar to option A, this command sets the PATH variable but does not include 'export,' meaning that the change will only persist in the current shell and not be passed on to any subprocesses. This makes it ineffective for ensuring that all subsequent commands can access the new directory.
This is the correct command, as it both assigns the new value to the PATH variable and includes the 'export' keyword, allowing all child processes to inherit the updated PATH. This ensures that any executables in /new/dir can be run from anywhere in the shell.
This command is incorrect because it mistakenly uses the '$' sign before PATH in the export statement. The correct syntax should be 'export PATH=...' without the dollar sign. This error would prevent the command from executing as intended.
While this command attempts to export a new PATH, the use of a semicolon followed by '$PATH' does not correctly append the existing PATH to the new directory. The syntax is incorrect, as it would not achieve the intended effect of adding /new/dir to the PATH.
The command that effectively adds the directory /new/dir to the PATH environment variable while ensuring it is available for all child processes is 'export PATH=/new/dir:$PATH.' Other options fail either due to syntax errors or the absence of the 'export' keyword, which is crucial for the visibility of the changes across subprocesses. Understanding these nuances is essential for effective shell command usage and environment management.
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