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Commands Reference, Volume 1

capture Command


Allows terminal screens to be dumped to a file.


capture [ -a ] [ File ]


The capture command allows a user to dump everything printed on the user's terminal to a file. The screen is printed to the file specified by the File parameter or to the screen.out file if no file is specified. If the -a flag is specified, the capture command appends the contents of the screen to the file.

In order to dump the screen to a file, the capture command creates a shell that emulates a VT100 terminal and maintains a record of what is being displayed on the screen. The SHELL environment variable determines the shell created. If the SHELL environment variable is not set, the /usr/bin/bsh shell is the default. The TERM environment variable is set to TERM=vt100. If, while running the capture command, the program asks for the terminal type in use, the user must enter vt100.

The Ctrl-P key sequence is the default keystroke to cause a screen dump to be performed. This can be changed by setting the SCREENDUMP environment variable to the 3-digit octal value of the desired screen dump key. For example, setting:


changes the screen dump keystroke to Ctrl-L. Trying to set the SCREENDUMP environment variable by entering ^L or '\014' results in an error message.

To stop the screen capture process, use the Ctrl-D key sequence or type exit. The system displays the message, You are NO LONGER emulating a vt100 terminal.


-a Appends the screen contents to the specified file or, if no file is specified, to the screen.out file.


/usr/bin/capture Contains the capture command.

Related Information

The bsh command, csh command, ksh command, script command.

The Input and Output Redirection Overview in AIX 5L Version 5.2 System User's Guide: Operating System and Devices describes how the operating system processes input and output and how to use redirect and pipe symbols.

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