Re: bash help setting variables

["Steven W. Orr" <steveo@xxxxxxxxxxx>]

On 10/17/09 14:58, quoth Donald Russell:
> I'm trying to write a bash script which makes an inquiry to an http
> service that replies with a series of keyword=value plain text data,
> one pair per line.
> I want to extract only a few of the lines, and make variables of them
> available to rest of my bash script.
> 
> I have this so far, and it works fine in terms of selecting the
> correct data items... but how can I get them into $1 $2, or other
> symbolic names?
> 
> wget -O - http://.../cgi-bin/dirent?ntid=$MYVAR \
>         | egrep '^(LastName)|(FirstName)|(Email)=' \
>         | sort \
>         | sed s/.*=//
> 
> The idea of sorting was because I was anticipating putting the results
> in an array, then I'd know array[0] is email... etc
> 
> I also tried using sed to convert those lines into assignment
> statements and piping that to eval... nope
> 
> This sort of thing must be pretty common, but I'm just missing
> something fundamental.
> 
> I tried setting variable like this:
> myarray=$( <all that stuff above> )
> 
> but that just created a variable with all the item including their \n
> characters...
> I'm ALMOST there... I just have to add some sed stuff to escape
> quotes, and wrap quotes so I can use the pieces in other commands.
> But what's giving me trouble is how to get the individual parts into
> individual vars, or array elements.
> 
> Any assistance is appreciated.
> 
> Thanks
> 

If this produces the output you claim it does then the first run will do what
you want. The 2nd is just to remind people how elegant bash can be.

#! /bin/bash

wget_cmd()
{
    cat <<EOF
Somelastname
Somefirstname
Some@xxxxxxxxxxx
EOF
}

# or you could just do this

wget2_cmd()
{
    # Don't pipe to sort and sed
    cat <<EOF
LastName='Some von lastname'
FirstName='Somefirstname'
Email='Some@xxxxxxxxxxx'
EOF
}

# Example 1 using wget_cmd
myarray=($(wget_cmd))

echo "myarray[LastName]=${myarray[LastName]}"
echo "myarray[FirstName]=${myarray[FirstName]}"
echo "myarray[Email]=${myarray[Email]}"

# Example 2 using wget_cmd2
typeset oldIFS="${IFS}"
typeset line
IFS==

while read line
do
    set -- $line
    case $1 in
    LastName)
	myarray[LastName]="$2"
	;;
    FirstName)
	myarray[FirstName]="$2"
	;;
    Email)
	myarray[Email]="$2"
	;;
    *)
	echo "Dood you blue it:$1" 1>&2
	exit 1
	;;
    esac
done < <(wget2_cmd)

echo "myarray[LastName]=${myarray[LastName]}"
echo "myarray[FirstName]=${myarray[FirstName]}"
echo "myarray[Email]=${myarray[Email]}"





-- 
Time flies like the wind. Fruit flies like a banana. Stranger things have  .0.
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Donor?Black holes are where God divided by zero. Listen to me! We are all- 000
individuals! What if this weren't a hypothetical question?
steveo at syslang.net

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