shell - bash script get substring from string -

i need part of string depending on value long string (for example output ps -ef).

for example source string:

long_string1="cmd ... -aaaa=a -bbbb=b -zzzz=z -dhome=/home/user/xxx -cccc=c ... etc." 

or

long_string2="cmd ... -aaaa=a -dhome=/home/user/xxx -bbbb=b -zzzz=z -cccc=c ... etc." 

i want extract or following subtring after -dhome= :

/home/user/xxx 

position of "-dhome=" not fixed, anywhere in long_string.

i using following command:

echo $long_string1|sed -e 's/.*-dhome=//g;s/ -cccc=c.*//g' 

it works fine $long_string1 doesn't work $long_string2.

it work when "-cccc=c" netx "-dhome=" :-(

how can path after "-dhome=" not depend on next values e.g. "-cccc=c" ???

is there more effective way or regexp same output ?

thanks m.gi

awk , cut can you.

#!/bin/bash get_home() { awk -f "dhome=" '{print $2}' <<< "${long_string}" | cut -d ' ' -f1; }  long_string="cmd ... -aaaa=a -bbbb=b -zzzz=z -dhome=/home/user/xxx -cccc=c ... etc." get_home long_string="cmd ... -aaaa=a -dhome=/home/user/xxx -bbbb=b -zzzz=z -cccc=c ... etc." get_home long_string="cmd ... -aaaa=a -dhome=/home/user/xxx" get_home 

output

/home/user/xxx /home/user/xxx /home/user/xxx 

awk splits input on "dhome=" , prints second part.
cut splits on spaces , gets first part. obviously, not work correctly if name of folder contains spaces. usually, home directories don't have spaces in names.