labreport1.md

Lab Report 1 - Remote Access and FileSystem

All commands in this lab will be run from the /home directory. The file structure for this is shown in the image below.

The cd command

1. No arguments

[user@sahara ~]$ cd
[user@sahara ~]$ 

• Before the cd command was run, the working directory was /home.
• Since an argument was not given, the cd command changed into the root directory, which was /home. Since we were already in the /home directory, nothing happened.
• There is no output, so no error occurs.

2. Path to a directory

[user@sahara ~]$ cd lecture1
[user@sahara ~/lecture1]$ 

• Before the cd command was run, the working directory was /home.
• The only directory contained directly inside of /home was lecture1. When lecture1 is passed as the argument for the cd command, the working address changes to /home/lecture1.
• No error occurs when this command is run.

3. Path to a file

[user@sahara ~]$ cd lecture1/Hello.java 
bash: cd: lecture1/Hello.java: Not a directory
[user@sahara ~]$

• Before the cd command was run, the working directory was /home.
• There is no file contained directly inside of /home, so I used the path to Hello.java, which was lecture1/Hello.java. This did not work because the cd command can only receive directories as an input, not file names.
• This output shows an error because I cannot cd into Hello.java, as it is a file.

The ls command

1. No arguments

[user@sahara ~]$ ls
lecture1
[user@sahara ~]$ 

• The ls command is run from the /home directory.
• The ls command shows an overview of all the files and directories directly inside the working directory. No input is given, so the command works from the /home directory. Since the only item directly inside of /home is lecture1, the ls command outputs lecture1.
• No error occurs with this command.

2. Path to a directory

[user@sahara ~]$ ls lecture1
Hello.class  Hello.java  messages  README
[user@sahara ~]$ 

• The ls command is run from the /home directory.
• Since ls lists all the files within the given directory, this command lists all the directories and files in /lecture1 because that is the input given.
• No error occurs on this command.

3. Path to a file

[user@sahara ~]$ ls lecture1/Hello.java
lecture1/Hello.java
[user@sahara ~]$ 

• The ls command is run from the /home directory.
• There are no files directly within /home, so I use lecture1/Hello.java to access the Hello.java file. This outputs the path for Hello.java.
• No error occurs here, but this command is ideally used to access files inside directories (not for files).

The cat command

1. No arguments

   [user@sahara ~]$ cat
   f
   f
   
   

• The cat command is run from the /home directory.
• When cat is run with no input, the terminal freezes and runs infinitely. This is because cat provides a preview of files and directories, but nothing was given as an argument. When I typed something in the terminal while the command was running, the terminal provided an output of the copy of whatever I typed.
• An error occurs because no input is given, so cat cannot provide a preview of any file or directory.

2. Path to a directory

   [user@sahara ~]$ cat lecture1
   cat: lecture1: Is a directory
   [user@sahara ~]$ 
   

• The cat command is run from the /home directory.
• The input given is lecture1, which is a directory located inside /home. Therefore, running cat provides the information for lecture1 by saying that it is a directory.
• An error occurs because cat is meant to provide the data stored in a file. Since a directory is given instead, cat cannot provide a file preview.

3. Path to a file

   [user@sahara ~]$ cat lecture1/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) t
   hrows IOException {
       String content = Files.readString(Path
   .of(args[0]), StandardCharsets.UTF_8);    
       System.out.println(content);
   }
   }
   [user@sahara ~]$ 
   

• The cat command is run from the /home directory.
• No file is located directly inside /home, so the path provided is /lecture1/Hello.java. This command outputs the code written in Hello.java.
• No error occurs on this command.