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Full Discussion: Bash variable assignment failure/unary operator expected
Top Forums Shell Programming and Scripting Bash variable assignment failure/unary operator expected Post 303012604 by port43 on Tuesday 6th of February 2018 02:47:26 PM
Old 02-06-2018
Bash variable assignment failure/unary operator expected
I have a little code block (executing on AIX 7.1) that I cannot understand why the NOTFREE=0 does not appear to be assigned even though it goes through that block. This causes a unary operator issue.
Code:
#!/bin/bash
PLATFORM="AIX"
NEEDSPC=3000
set -x

if [ "${PLATFORM}" = "AIX" ]; then
    lsvg | grep -v rootvg | while read VGNAME
    do
        PPSTRG=$(lsvg ${VGNAME} | awk -F: '/PP SIZE/ {print $NF}')
        PPSIZE=$(echo ${PPSTRG} | awk '{print $1}')
        PPFREE=$(lsvg ${VGNAME} | awk -F: '/FREE PP/ {print $NF}' | awk '{print $1}')
        ((FREESPACE=${PPFREE}*${PPSIZE}))
        if [ ${FREESPACE} -gt ${NEEDSPC} ]; then
            printf "Sufficient free space for LV in ${VGNAME}\n"
            ((PPNEED=${NEEDSPC}/${PPSIZE}+1))
            NOTFREE=0
            break
        else
            printf "Insufficient space to create LV in ${VGNAME}\nFree space: ${FREESPACE} MB  Required: ${NEEDSPC} MB\nExpand ${VGNAME} and retry\n"
            NOTFREE=1
        fi
    done
    if [ ${NOTFREE} -eq 1 ]; then
        printf "nope\n"
        exit 64
    fi
else
    printf "Solaris\n"
fi
printf "NOTFREE: ${NOTFREE}\n"

yields:
Code:
prompt> ./dammit
+ '[' AIX = AIX ']'
+ lsvg
+ grep -v rootvg
+ read VGNAME
++ lsvg datavg
++ awk -F: '/PP SIZE/ {print $NF}'
+ PPSTRG='        256 megabyte(s)'
++ echo 256 'megabyte(s)'
++ awk '{print $1}'
+ PPSIZE=256
++ lsvg datavg
++ awk -F: '/FREE PP/ {print $NF}'
++ awk '{print $1}'
+ PPFREE=239
+ (( FREESPACE=239*256 ))
+ '[' 61184 -gt 3000 ']'
+ printf 'Sufficient free space for LV in datavg\n'
Sufficient free space for LV in datavg
+ NOTFREE=0
+ break
+ '[' -eq 1 ']'
./dammit: line 23: [: -eq: unary operator expected
+ printf 'NOTFREE: \n'
NOTFREE:

Yet if I strip out everything except the assignments and if blocks like:
Code:
#!/bin/bash
PLATFORM="AIX"
FREESPACE=4
NEEDSPC=3
set -x

if [ "${PLATFORM}" = "AIX" ]; then
    if [ ${FREESPACE} -gt ${NEEDSPC} ]; then
        NOTFREE=0
    else
        NOTFREE=1
    fi
    if [ ${NOTFREE} -eq 1 ]; then
        printf "nope\n"
    fi
fi
printf "NOTFREE: ${NOTFREE}\n"

The NOTFREE=0 assignment is made like:
Code:
prompt> ./test.sh
+ '[' AIX = AIX ']'
+ '[' 4 -gt 3 ']'
+ NOTFREE=0
+ '[' 0 -eq 1 ']'
+ printf 'NOTFREE: 0\n'
NOTFREE: 0

I'm being dragged, kicking and screaming, into bash from ksh due to SuSE gradually dropping ksh so I'm positive that I have some syntax issue going on but I have no idea what.


Also:
Code:
prompt> bash --version
GNU bash, version 4.2.50(1)-release (powerpc-ibm-aix6.1.2.0)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

 

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