UNIX Shells by Example (4th Edition)

What are the names of the three file streams associated with your terminal?

What is a file descriptor?

What command would you use to do the following:

1. Redirect the output of the ls command to a file called lsfile ?

2. Redirect and append the output of the date command to lsfile ?

3. Redirect the output of the who command to lsfile ? What happened ?

Perform the following:

1. Type cp all by itself. What happens?

2. Save the error message from the above example to a file.

3. Use the find command to find all files, starting from the parent directory, of type directory . Save the standard output in a file called found and any errors in a file called found.errs .

4. Take the output of three commands and redirect the output to a file called gottem_all .

5. Use a pipe(s) with the ps and wc commands to find out how many processes you are currently running.