Linux Shell Scripting Bootcamp

Chapter 7. Working with Files

This chapter will show how to read from and write to text files. It will also cover file encryption and checksums.

The topics covered in this chapter are as follows:

• Show how to write out a file using the redirection operator
• Show how to read a file
• Explain how the output from a command can be captured and used in a script
• Go over cat and other important commands
• Cover file encryption and checksum programs such as sum and OpenSSL

Writing files

We showed in some of the previous chapters how to create and write files by using the redirection operator. To recap, this command will create the file ifconfig.txt (or overwrite the file if it already exists):

  ifconfig  >  ifconfig.txt

The following command will append to any previous ...