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Full Discussion: Script returning 0
Top Forums Shell Programming and Scripting Script returning 0 Post 302769964 by RudiC on Thursday 14th of February 2013 04:09:29 AM
Old 02-14-2013
I have to revise my comment: I've taken the backtics for single quotes due to sloppy reading - sorry for that.
So, OUTPUT will contain the desired info from df -lP line by line, which you can and do read into several variables to compute with - in a subshell! You can't have subshell variables returned to the calling script except by echoing them there and reading them here.
If I read your script correctly (now, finally!), all you want is the overall available size in MB. Why don't you try to get that in an one-liner:
Code:
df -lP | awk 'NR>1 {sum+=$4/1024} END {print sum}'
30569.2

 

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sum(1B) 					     SunOS/BSD Compatibility Package Commands						   sum(1B)

NAME
sum - calculate a checksum for a file SYNOPSIS
/usr/ucb/sum file... DESCRIPTION
sum calculates and displays a 16-bit checksum for the named file and displays the size of the file in kilobytes. It is typically used to look for bad spots, or to validate a file communicated over some transmission line. The checksum is calculated by an algorithm which may yield different results on machines with 16-bit ints and machines with 32-bit ints, so it cannot always be used to validate that a file has been transferred between machines with different-sized ints. USAGE
See largefile(5) for the description of the behavior of sum when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
sum(1), wc(1), attributes(5), largefile(5) DIAGNOSTICS
Read error is indistinguishable from EOF on most devices; check the block count. NOTES
sum and /usr/bin/sum (see sum(1)) return different checksums. This utility is obsolete. SunOS 5.10 8 Nov 1995 sum(1B)
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