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Top Forums Shell Programming and Scripting assigning SED output to a variable = trouble! Post 302233953 by hungryd on Monday 8th of September 2008 08:54:42 PM
Old 09-08-2008
assigning SED output to a variable = trouble!

i'm on a Mac running BSD unix.

i have a script in which i ask the user to input the name of a mounted volume. i then call SED to substitute backslashes and spaces in place of the spaces. that looks like this:

echo "Enter the name of the volume"
read Volume
echo "You've chosen \"$Volume\""
# remove spaces from name of Volume
echo $Volume | sed 's/ /\\ /g'

if i enter "old mac hd" for the volume name when prompted, it returns with:
"old/ mac/ hd" which is perfect!

but... if i then want to assign this output to a variable for later use, it doesn't work:

uVolume=`echo "$Volume" | sed 's/ /\\ /g'`
echo $uVolume

this returns:
"old mac hd" and NOT "old/ mac/ hd" as i'd like. and, as i'll be using the full directory path in a later portion of the script, i kinda need those backslashes!

i'm assuming that i'm missing simple syntax here. thoughts/comments/questions?
 

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media_getid(3VOLMGT)					Volume Management Library Functions				      media_getid(3VOLMGT)

NAME
media_getid - return the id of a piece of media SYNOPSIS
cc [flag ...] file ...-lvolgmt [library ...] #include <volmgt.h> ulonglong_t media_getid(char *vol_path); DESCRIPTION
media_getid() returns the id of a piece of media. Volume Management must be running. See volmgt_running(3VOLMGT). PARAMETERS
vol_path Path to the block or character special device. RETURN VALUES
media_getid() returns the id of the volume. This value is unique for each volume. If media_getid() returns 0, the path provided is not valid, for example, it is a block or char device. EXAMPLES
Example 1: Using media_getid() The following example first checks if Volume Management is running, then checks the volume management name space for path, and then returns the id for the piece of media. char *path; ... if (volmgt_running()) { if (volmgt_ownspath(path)) { (void) printf("id of %s is %lld ", path, media_getid(path)); } } If a program using media_getid() does not check whether or not Volume Management is running, then any NULL return value will be ambiguous, as it could mean that either Volume Management does not have path in its name space, or Volume Management is not running. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT Level |Safe | +-----------------------------+-----------------------------+ |Commitment Level |Public | +-----------------------------+-----------------------------+ SEE ALSO
volmgt_ownspath(3VOLMGT),volmgt_running(3VOLMGT),attributes(5) SunOS 5.10 29 Apr1998 media_getid(3VOLMGT)
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