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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 DEBIAN

gluster

Gluster(8)							   Gluster Inc. 							Gluster(8)

NAME

       gluster - Gluster Console Manager (command line utility)

SYNOPSIS

       gluster

       To run the program and display gluster prompt:

       gluster

       (or)

       To specify a command directly:

       gluster [commands] [options]

DESCRIPTION

       The  Gluster Console Manager is a command line utility for elastic volume management. You can run the gluster command on any export server.
       The command enables administrators to perform cloud operations, such as creating, expanding, shrinking, rebalancing, and migrating  volumes
       without needing to schedule server downtime.

COMMANDS

   Volume Commands
	volume info [all|<VOLNAME>]
	      Display information about all volumes, or the specified volume.

	volume create <NEW-VOLNAME> [stripe <COUNT>] [replica <COUNT>] [transport <tcp|rdma|tcp,rdma>] <NEW-BRICK> ...
	      Create  a  new  volume  of the specified type using the specified bricks and transport type (the default transport type is tcp).	To
	      create a volume with both transports (tcp and rdma), give 'transport tcp,rdma' as an option.

	volume delete <VOLNAME>
	      Delete the specified volume.

	volume start <VOLNAME>
	      Start the specified volume.

	volume stop <VOLNAME> [force]
	      Stop the specified volume.

	volume rename <VOLNAME> <NEW-VOLNAME>
	      Rename the specified volume.

	volume set <VOLNAME> <OPTION> <PARAMETER> [<OPTION> <PARAMETER>] ...
	      Set the volume options.

	volume help
	      Display help for the volume command.

   Brick Commands
	volume add-brick <VOLNAME> <NEW-BRICK> ...
	      Add the specified brick to the specified volume.

	volume remove-brick <VOLNAME> <BRICK> ...
	      Remove the specified brick from the specified volume.

	      Note: If you remove the brick, the data stored in that brick will not be available. You can migrate data from one brick  to  another
	      using replace-brick option.

	volume rebalance-brick <VOLNAME>(<BRICK> <NEW-BRICK>) start
	      Start rebalancing the specified volume.

	volume rebalance <VOLNAME> stop
	      Stop rebalancing the specified volume.

	volume rebalance <VOLNAME> status
	      Display the rebalance status of the specified volume.

	volume replace-brick <VOLNAME> (<BRICK> <NEW-BRICK>) start|pause|abort|status|commit
	      Replace the specified brick.

   Log Commands
	volume log filename <VOLNAME> [BRICK] <DIRECTORY>
	      Set the log directory for the corresponding volume/brick.

	volume log locate <VOLNAME> [BRICK]
	      Locate the log file for corresponding volume/brick.

	volume log rotate <VOLNAME> [BRICK]
	      Rotate the log file for corresponding volume/brick.

   Peer Commands
	peer probe <HOSTNAME>
	      Probe the specified peer.

	peer detach <HOSTNAME>
	      Detach the specified peer.

	peer status
	      Display the status of peers.

	peer help
	      Display help for the peer command.

   Other Commands
	help  Display the command options.

	quit  Exit the gluster command line interface.

FILES

       /etc/glusterd/*

SEE ALSO

       fusermount(1), mount.glusterfs(8), glusterfs(8), glusterd(8)

COPYRIGHT

       Copyright(c) 2006-2011  Gluster, Inc.  <http://www.gluster.com>

07 March 2011						   Gluster command line utility 						Gluster(8)
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