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Top Forums Shell Programming and Scripting pipe to grep doesn't work in bash script Post 302597684 by kcstrom on Saturday 11th of February 2012 11:28:23 AM
Old 02-11-2012
pipe to grep not working in bash script

Hi,

I'm trying to write a script that checks gvfs to see if a mount exists so I can run it from network-manager's status hooks. I thought I'd pipe the output of gvfs-mount -l to grep for the particular mounts I care about. When I do this in a bash script:

Code:
cmnd="gvfs-mount -l | grep -i '${mount}'"
dastring=`${cmnd}` #remove me
ret=$?
echo "Output from ${cmnd}" #remove me
echo "$dastring"

$dastring looks like the output from gvfs-mount (although it's detailed as if I gave it the -i option in addition to -l).

If I copy and paste the ${cmnd} (from where I echo it) and run it directly from the terminal, it display the line of text I'm looking for with grep.

Can anyone help me figure out why the pipe works directly in the terminal but does not appear to be doing so in the script?

Thanks in advance.

Last edited by kcstrom; 02-11-2012 at 12:39 PM..
 

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gvfs-mkdir(1)							   User Commands						     gvfs-mkdir(1)

NAME
gvfs-mkdir - make a directory using the VFS system SYNOPSIS
gvfs-mkdir URI DESCRIPTION
gvfs-mkdir makes a directory specified by an URI using the VFS system. OPERANDS
The following operands are supported: URI Specifies the file location in standard URI format. EXAMPLES
Example 1: Create a local directory example% gvfs-mkdir file:///tmp/example Example 2: Create a remote directory example% gvfs-mkdir ftp://example.com/dir ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables: NLSPATH. EXIT STATUS
The exit value 0 is returned regardless of success or failure. FILES
The following files are used by this application: /usr/bin/gvfs-mkdir Executable to make a directory using the VFS system ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWgnome-gvfs | +-----------------------------+-----------------------------+ |Interface stability |Volatile | +-----------------------------+-----------------------------+ SEE ALSO
gvfs-copy(1), gvfs-info(1), gvfs-less(1), gvfs-ls(1), gvfs-cat(1) gvfs-monitor-dir(1), gvfs-monitor-file(1), gvfs-mount(1), gvfs-move(1), gvfs-open(1), gvfs-rm(1), gvfs-save(1), gvfs-trash(1), gvfs-tree(1), attributes(5), environ(5) NOTES
Written by Alvaro Lopez Ortega, Sun Microsystems Inc., 2008. SunOS 5.11 25 Mar 2008 gvfs-mkdir(1)
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