Explain what the following statements do:

1. ls mydir > foo.txt
2. ls mydir > foo.txt 2>&1
3. cat file1 file2 > file3
4. cat file1 file2 >> file3

Write the Bash statements to:

1. Create a new file called banana-file-names.txt with the concatenated contents of every file in the current directory that starts with "banana"
2. Create a new file called banana-file-content.txt with the concatenated contents of every file in the current directory that contains the word "banana"

Write the Bash statements to:

1. Count the number of files ending in .java, in the current directory that have the string "pumpkin" in the file contents?
2. Do the same, including files in any sub-directory (recursively)
3. Replace every occurrence of "pumpkin" with "banana" in each of the files

Explain what each of the following Bash statements does and the overall result:

$ (date ; ps -ef | awk ‘{print $1}’ | sort | uniq | wc -l ) >> processes.log

Explain what the following Bash command does:

find . -type f -atime -7 > /tmp/recent_files