show commands | Display the last ten commands in the command |
| history. |
show commands n | Print ten commands centered on command |
| number n. |
show commands + | Print ten commands just after the commands last |
| printed. |
17.4 Setting the GDB Screen Size
Certain commands to GDB may produce large amounts of information output to the screen. To help you read all of it, GDB pauses and asks you for input at the end of each page of output. Type RET when you want to continue the output, or q to discard the remaining output. Also, the screen width setting determines when to wrap lines of output. Depending on what is being printed, GDB tries to break the line at a readable place, rather than simply letting it over flow onto the following line.
Normally GDB knows the size of the screen from the terminal driver software. For example, on Unix, GDB uses the termcap data base together with the value of the TERM environment variable and the stty rows and stty cols settings. If this is not correct, you can override it with the set height and set width commands:
set height lpp, show height se, set width cpl, show width
These set commands specify a screen height of lpp lines and a screen width of cpl characters. The associated show commands display the current settings.
If you specify a height of zero lines, GDB does not pause during output no matter how long the output is. This is useful if output is to a file or to an editor buffer.
Likewise, you can specify set width 0 to prevent GDB from wrapping its output.
17.5 Supported Number Formats
You can always enter numbers in octal, decimal, or hexadecimal in GDB by the usual conventions: octal numbers begin with `0', decimal numbers end with `.', and hexadecimal numbers begin with `0x'. Numbers that begin with none of these are, by default, entered in base 10; likewise, the default display for numberswhen no particular format is specified is base 10. You can change the default base for both input and output with the set radix command.
set | Set the default base for numeric input. Supported |
| choices for base are decimal 8, 10, or 16. base must |
| itself be specified either unambiguously or using the |
| current default radix; for example, any of |
| set radix 012 |
| set radix 10 |
17.4 Setting the GDB Screen Size 283