Как удалить файл без команды "удалить" в Linux

[ruslan@localhost]$

touch file1 # regural file

touch file2 # we will remove this file by a hint

echo "This is first file" > file1

echo "This is second file" > file2

cat file1

"This is first file"

cat file2

"This is second file"

ls

file1 file2

mv file1 file2

ls

file2

cat file2

"This is first file"

#Where is the second file? Thoughts?