Shell Programming and Scripting

# cat test.sh
#! /bin/sh
typeset -a arr

read_params()
{
#while read line
until [ -z "$1" ]
do
    if [ `expr index "$1" =` != 0 ] ; then
        var="${1%%=*}"
        for key in ${1//,/ }
        do
                val="${key#${var}=}"
                val="${val%=*}"
                if [ ! -z arr["$var"] ]
                then
                        arr["$var"]="${arr["$var"]} $val"
                else
                        arr["$var"]="$val"
                fi
        done
            eval $var=\"${arr["$var"]}\"
    fi
shift
done
#done < $1

for k in "${!arr[@]}"
do
        printf "%s %s\n" "$k" "${arr["$k"]}"
done

}

main()
{
read_params `cat file`

echo "$temp  and $lib and $"r.etc" "

}

main

# cat file
temp=/usr=25,/usr/lib=12
bin=12
r.etc=45
lib=12:6

# sh -x test.sh
+ typeset -a arr
+ main
++ cat file
+ read_params temp=/usr=25,/usr/lib=12 bin=12 r.etc=45 lib=12:6
+ '[' -z temp=/usr=25,/usr/lib=12 ']'
++ expr index temp=/usr=25,/usr/lib=12 =
+ '[' 5 '!=' 0 ']'
+ var=temp
+ for key in '${1//,/ }'
+ val=/usr=25
+ val=/usr
+ '[' '!' -z 'arr[temp]' ']'
+ arr["$var"]=' /usr'
+ for key in '${1//,/ }'
+ val=/usr/lib=12
+ val=/usr/lib
+ '[' '!' -z 'arr[temp]' ']'
+ arr["$var"]=' /usr /usr/lib'
+ eval 'temp="' /usr '/usr/lib"'
++ temp=' /usr /usr/lib'
+ shift
+ '[' -z bin=12 ']'
++ expr index bin=12 =
+ '[' 4 '!=' 0 ']'
+ var=bin
+ for key in '${1//,/ }'
+ val=12
+ val=12
+ '[' '!' -z 'arr[bin]' ']'
+ arr["$var"]=' /usr /usr/lib 12'
+ eval 'bin="' /usr /usr/lib '12"'
++ bin=' /usr /usr/lib 12'
+ shift
+ '[' -z r.etc=45 ']'
++ expr index r.etc=45 =
+ '[' 6 '!=' 0 ']'
+ var=r.etc
+ for key in '${1//,/ }'
+ val=45
+ val=45
+ '[' '!' -z 'arr[r.etc]' ']'
test.sh: line 17: r.etc: syntax error: invalid arithmetic operator (error token is ".etc")

echo "$temp  and $lib $"r.etc" "

/usr /usr/lib and 12:16 45

with out trailing spaces for each variable means "temp, lib and r.etc"

#!/bin/sh
typeset -a arr

. $file       # Setting environment here

echo "temp=\"$temp\", lib=\"$lib\" and r_etc=\"$r_etc\""

# Real processing continues here ....

temp=` grep "^temp=" file  | cut -f2 -d"=" | tr "," " "`
lib=`  grep "^lib=" file   | cut -f2 -d"="`
r_etc=`grep "^r.etc=" file | cut -f2 -d"="`

echo "temp=\"$temp\" lib=\"$lib\" r_etc=\"$r_etc\""

echo "$temp and $lib $r_etc"