Getting ready

Let's get ready for the exercise by creating a few text files and directories, and adding some content:

$ cd ~/
$ mkdir -p fileops
$ touch fileops/empty.txt
$ echo "abcd1234!!" > fileops/string.txt
$ echo "yieldswordinthestone" > fileops/swordinthestone.txt
$ touch fileops/read.txt fileops/write.txt fileops/exec.txt fileops/all.txt
$ chmod 111 fileops/exec.txt; chmod 222 fileops/write.txt; chmod 444 fileops/read.txt; fileops/all.txt;chmod 777 fileops/all.txt
$ sudo useradd bob
$ echo "s the name" > fileops/bobs.txt
$ sudo chown bob.bob fileops/bobs.txt

This recipe is about performing some simple file tests and to combine some of the other knowledge from earlier recipes on conditional logic, but with a twist—using user input from the CLI and file permissions.