Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth Edition

Running the New Shell Program

You can run your new shell program in several ways. Each method produces the same results, which is a testament to the flexibility of using the shell with Linux. One way to run your shell program is to execute the file myenv from the command line as if it were a Linux command:

matthew@seymour:~$ ./myenv

A second way to execute myenv under a particular shell, such as pdksh, is as follows:

matthew@seymour:~$ pdksh myenv

This invokes a new pdksh shell and passes the filename myenv as a parameter to execute the file. A third way requires you to create a directory named bin in your home directory and to then copy the new shell program into this directory. You can then run the program without the need to specify a specific ...