$)$ How can you create a file named $-$i$?$ Which techniques do not work, and why do they not work? How can you remove the file named $-$i$?$ b$)$ Explain the following error message. Which filenames would a subsequent ls display? $ ls abc abd abe abf abg abh $ rm abc ab$*$ rm: cannot remove 'abc': No such file or directory c$)$ Explain the error messages displayed in the following sequence of commands: $ ls $-$l total $1$ drwxrwxr$-$x $2$ max pubs $10242010-03-0217$:$57$ dirt $ ls dirt $ rmdir dirt rmdir: dirtmp: Directory not empty $ rm dirt$/*$ rm: No match. d$)$ Directory permission i$.$ Make sure you are NOT the $$root$$ user for this exercise. Why? ii$.$ Create a new directory. What is the default permission for this directory? iii. Create a new file in the new directory. What is the default permission for this file? iv$.$ Set the directory permission to $400.$ What does it mean? v$.$ Set the directory permission to $100.$ What does it mean? vi$.$ Set the directory permission to $200.$ What does it mean? e$)$ How to set permissions for the following scenarios? i$.$ You can modify a file but cannot delete it$.$ ii$.$ You can see the files names $($directory content$)$ but you cannot read their contents or modify them