Shell Programming and Scripting

#!/usr/bin/env bash

# @(#) s2	Demonstrate parse line into variables, bash built-in read.

# List environment for demonstration computation.
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C sed

line="DNS = cn=user1,o=company : pwd"
pl " Line to be parsed into variables:"
pe "$line"
line=$( echo "$line" | sed -e 's/ //g' -e 's/=/_/' -e 's/:/_/')
pe " Line prepared by sed:"
pe "$line"

oldifs="$IFS"
IFS="_" read s u p junk <<< "$line"

pl " Results of setting variables from sed, read:"
pe "service name: $s"
pe "UserName: $u"
pe "Password: $p"

unset s u p
pl " Sequence of \"Parameter Expansions\":"
line="DNS = cn=user1,o=company : pwd"
pe "$line"
line=${line// /}
pe "$line"
line=${line/=/_}
pe "$line"
line=${line/:/_}
pe "$line"
IFS="_" read s u p junk <<< "$line"
pl " Results of setting variables from expansion, read:"
pe "service name: $s"
pe "UserName: $u"
pe "Password: $p"

IFS="$oldifs"

exit 0

% ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
bash GNU bash 3.2.39
sed GNU sed version 4.1.5

-----
 Line to be parsed into variables:
DNS = cn=user1,o=company : pwd
 Line prepared by sed:
DNS_cn=user1,o=company_pwd

-----
 Results of setting variables from sed, read:
service name: DNS
UserName: cn=user1,o=company
Password: pwd

-----
 Sequence of "Parameter Expansions":
DNS = cn=user1,o=company : pwd
DNS=cn=user1,o=company:pwd
DNS_cn=user1,o=company:pwd
DNS_cn=user1,o=company_pwd

-----
 Results of setting variables from expansion, read:
service name: DNS
UserName: cn=user1,o=company
Password: pwd