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LabReport1.md

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Lab Report 1

  1. cd with no arguments
[user@sahara ~/lecture1/messages]$ cd
[user@sahara ~]$

The working directory is /home/lecture1/messages. cd changes directory, and when I provide no arguments, it changes to the home directory, /home by default. This output is expected and not an error.

  1. cd with path to directory
[user@sahara ~]$ cd lecture1
[user@sahara ~/lecture1]$

The working directory is /home. In this case, I passed in the path to the directory lecture1. This changed my directory to /home/lecture1. This output is expected and not an error.

  1. cd with path to file
[user@sahara ~/lecture1]$ cd Hello.java
bash: cd: Hello.java: Not a directory

The working directory is /home/lecture1. I passed in the path to the file Hello.java. The terminal printed out an error message that Hello.java is not a directory. This is an error that occurred because cd changes directories. If you pass in an argument to cd, it should be a directory, not a file name.

  1. ls with no arguments
[user@sahara ~]$ ls
lecture1

The working directory is /home. ls lists the files and directories under the working directory. /home contains the folder lecture1, so it printed out 'lecture1'. This output is expected and not an error.

  1. ls with path to directory
[user@sahara ~]$ ls lecture1
Hello.class  Hello.java  messages  README

The working directory is /home. I passed in the folder lecture1, which is contained in /home. ls then printed all the files and the folder messages in the lecture1 folder. This output is expected and not an error.

  1. ls with path to file
[user@sahara ~/lecture1]$ ls Hello.java
Hello.java

The working directory is /home/lecture1. I passed in the file name Hello.java, which is contained in /home/lecture1. ls then printed out Hello.java, because the file has no subfiles or subfolders. This output is expected and not an error.

  1. cat with no arguments
[user@sahara ~]$ cat

hi
hi

The working directory is /home. This produced no output and clicking Enter just created a new line. This is because no arguments are passed so the terminal just waits for input. I then typed in 'hi' and it printed 'hi' back. This is because it now just echoes input until you interrupt the terminal. This output is not an error, although I did not expect this behavior since it is different from the command's original function.

  1. cat with path to directory
[user@sahara ~]$ cat lecture1
cat: lecture1: Is a directory

The working directory is /home. Passing in one directory name caused cat to print that lecture1 is a directory. Therefore, after passing in a directory name to cat, the terminal informs the user that it is a directory. This output is expected and not an error.

  1. cat with path to file
[user@sahara ~/lecture1]$ cat Hello.java
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;

public class Hello {
  public static void main(String[] args) throws IOException {
    String content = Files.readString(Path.of(args[0]), StandardCharsets.UTF_8);    
    System.out.println(content);
  }
}

The working directory is /lecture1. Passing in the file name Hello.java caused cat to print the contents of the file. cat will print the contents of a file if it is passed in. This output is expected and not an error.