Unix Shell Programming, Third Edition

2. A Quick Review of the Basics

In This Chapter

• Some Basic Commands

• Working with Files

• Working with Directories

• Filename Substitution

• Standard Input/Output and I/O Redirection

• Pipes

• Standard Error

• More on Commands

• Command Summary

• Exercises

This chapter provides a review of the Unix system, including the file system, basic commands, filename substitution, I/O redirection, and pipes.

Some Basic Commands

Displaying the Date and Time: The date Command

The date command tells the system to print the date and time:

$ dateSat Jul 20 14:42:56 EDT 2002$

date prints the day of the week, month, day, time (24-hour clock, the system’s time zone), and year. Throughout this book, whenever we use boldface type like this, it’s to indicate ...