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Full Discussion: Having a terrible problem with quotes/single quotes!
Top Forums Shell Programming and Scripting Having a terrible problem with quotes/single quotes! Post 302542130 by jondecker76 on Tuesday 26th of July 2011 08:22:41 PM
Old 07-26-2011
Having a terrible problem with quotes/single quotes!
Hello. I'm trying to write a bash script that uses GNU screen and have hit a brick wall that has cost me many hours... (I'm sure it has something to do with quoting/globbing, which is why I post it here)

I can make a script that does the following just fine:

test.sh:
Code:
#!/bin/bash

# make a screen session named blah with a window named "dummy"
screen -dmS blah -t dummy
# and give it a specific hardstatus line
screen -r blah -X hardstatus on
screen -r blah -X hardstatus alwayslastline
screen -r blah -X hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{= kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B} %m/%d/%y %{W}%c %{g}]'

# lastly, add a window, dummy2
screen -d -r blah -X screen -t dummy2

A simple `screen -r blah` will show it worked well! I have a pretty hardstatus line that shows the hostname, windownames, and dates.


Now I want to wrap the screen commands into a Launch command...

test2.sh:
Code:
#!/bin/bash

Launch()
{
     local cmd=$1
     local res
 
     res=$($cmd)


    echo $res
}



# make a screen session named blah with a window named "dummy"
Launch "screen -dmS blah -t dummy"
# and give it a specific hardstatus line
Launch "screen -r blah -X hardstatus on"
Launch "screen -r blah -X hardstatus alwayslastline"
Launch "screen -r blah -X hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{=  kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B}  %m/%d/%y %{W}%c %{g}]'"

# lastly, add a window, dummy2
Launch "screen -d -r blah -X screen -t dummy2"

if you do a `screen -r blah`now...
Most everything worked - it created the "blah" screen session, and even created the "dummy" and "dummy 2" windows.. But look at the status line, its just a blank white bar!

what am I doing wrong? This is killing me!
 

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LEARN ABOUT ULTRIX

defaultvisualofscreen

BlackPixelOfScreen(3X11)					     MIT X11R4						  BlackPixelOfScreen(3X11)

Name
       BlackPixelOfScreen, WhitePixelOfScreen, CellsOfScreen, DefaultColormapOfScreen, DefaultDepthOfScreen, DefaultGCOfScreen, DefaultVisualOf-
       Screen, DoesBackingStore, DoesSaveUnders, DisplayOfScreen, XScreenNumberOfScreen, EventMaskOfScreen, HeightOfScreen, HeightMMOfScreen, Max-
       CmapsOfScreen, MinCmapsOfScreen, PlanesOfScreen, RootWindowOfScreen, WidthOfScreen, WidthMMOfScreen - screen information functions and
       macros

Syntax
       BlackPixelOfScreen(screen)

       WhitePixelOfScreen(screen)

       CellsOfScreen(screen)

       DefaultColormapOfScreen(screen)

       DefaultDepthOfScreen(screen)

       DefaultGCOfScreen(screen)

       DefaultVisualOfScreen(screen)

       DoesBackingStore(screen)

       DoesSaveUnders(screen)

       DisplayOfScreen(screen)

       int XScreenNumberOfScreen(screen)
	  Screen *screen;

       EventMaskOfScreen(screen)

       HeightOfScreen(screen)

       HeightMMOfScreen(screen)

       MaxCmapsOfScreen(screen)

       MinCmapsOfScreen(screen)

       PlanesOfScreen(screen)

       RootWindowOfScreen(screen)

       WidthOfScreen(screen)

       WidthMMOfScreen(screen)

Arguments
       screen	 Specifies a pointer to the appropriate structure.

Description
       The macro returns the black pixel value of the specified screen.

       The macro returns the white pixel value of the specified screen.

       The macro returns the number of colormap cells in the default colormap of the specified screen.

       The macro returns the default colormap of the specified screen.

       The macro returns the default depth of the root window of the specified screen.

       The macro returns the default GC of the specified screen, which has the same depth as the root window of the screen.

       The macro returns the default visual of the specified screen.

       The macro returns or which indicate whether the screen supports backing stores.

       The macro returns a Boolean value indicating whether the screen supports save unders.

       The macro returns the display of the specified screen.

       The function returns the screen index number of the specified screen.

       The macro returns the root event mask of the root window for the specified screen at connection setup.

       The macro returns the height of the specified screen.

       The macro returns the height of the specified screen in millimeters.

       The macro returns the maximum number of installed colormaps supported by the specified screen.

       The macro returns the minimum number of installed colormaps supported by the specified screen.

       The macro returns the number of planes in the root window of the specified screen.

       The macro returns the root window of the specified screen.

       The macro returns the width of the specified screen.

       The macro returns the width of the specified screen in millimeters.

See Also
       AllPlanes(3X11), ImageByteOrder(3X11), IsCursorKey(3X11)
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

															  BlackPixelOfScreen(3X11)
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