command line editing

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Command line editing and history

If the readline library compiles on your system then the default prompt will be ga-> as opposed to ga>. This indicates that command line editing is active. The library defaults toemacs mode but can be set up to run using vi syntax.

Here's a list of the commands which may typically be used:

ctrl-a go to beginning of line


	
		ctrl-e   go to end of line


	
		ctrl-f   go forward one char


	
		ctrl-b   go backward one char


	
		ctrl-d   delete the char


	
		ctrl-p   recall previous line


	
		ctrl-n   recall next line


	
		ctrl-r   reverse search

You also get file name completion using the tab key. If there is more than one option, then double tab will list the available completions.

For example, suppose you are running grads on div40-2 at FNMOC and want to start looking for files to open...

Type open /h and get,

ga-> open /h and hit two tabs and get:

h home home1 home2

then type ome1 and tab tab and get,

ga-> open /home1/


		
			GCC bogus603 gnu iqpops nmcobs roesserd 
		
		
			GRIB cstrey grads lost+found pacek tsai 
		
		
			Mosaic dh hamilton mendhall picardr witt 
		
		
			NEWDBS dolan hout nicholso qcops

then type GR, tab to go to GRIB dir, followed by d, tab to go to the dat dir and then n, tab tab gives,

ga-> open /home1/GRIB/dat/nogaps.25.


		
			nogaps.25.95021600.grb    nogaps.25.95021912.grb 
		
		
			nogaps.25.95021600.gribmap    nogaps.25.95021912.gribmap 
		
		
			nogaps.25.95021612.anal.grb    nogaps.25.anal.ctl 
		
		
			nogaps.25.95021612.ctl    nogaps.25.anal.gribmap 
		
		
			nogaps.25.95021612.grb    nogaps.25.ls.mask.ctl 
		
		
			nogaps.25.95021612.gribmap    nogaps.25.ls.mask.dat 
		
		
			nogaps.25.95021700.anal.grb    nogaps.25.95021700.ctl

and type 950217 to get

ga-> open /home1/GRIB/dat/nogaps.25.950217


		
			nogaps.25.95021700.anal.grb    nogaps.25.95021712.ctl
		
		
			nogaps.25.95021700.ctl    nogaps.25.95021712.grb
		
		
			nogaps.25.95021700.grb    nogaps.25.95021712.gribmap
		
		
			nogaps.25.95021700.gribmap    nogaps.25.95021712.anal.grb

and finally open the 12Z data with 12.c, tab, return to open the file

nogaps.25.95021712.ctl

WARNING

There is no guarantee that these readline routines will always work, so the -h option has been added to the invocation of grads to turn them off.

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