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9.3 Editing Source Files

To edit the lines in a source file, use the edit command. The editing program of your choice is invoked with the current line set to the active line in the program. Alternatively, there are several ways to specify what part of the file you want to print if you want to see other parts of the program:

edit location

Edit the source file specified by location. Editing starts at that location, e.g., at the specified source line of the specified file. See Specify Location, for all the possible forms of the location argument; here are the forms of the edit command most commonly used:

edit number

Edit the current source file with number as the active line number.

edit function

Edit the file containing function at the beginning of its definition.

9.3.1 Choosing your Editor

You can customize GDB to use any editor you want 9. By default, it is /bin/ex, but you can change this by setting the environment variable EDITOR before using GDB. For example, to configure GDB to use the vi editor, you could use these commands with the sh shell:

export EDITOR
gdb …

or in the csh shell,

setenv EDITOR /usr/bin/vi
gdb …



The only restriction is that your editor (say ex), recognizes the following command-line syntax:

ex +number file

The optional numeric value +number specifies the number of the line in the file where to start editing.