regex on tnsnames.ora - regex

Question

my tnsnames.ora file has 2 formats :
db_cl =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = a55)(PORT = 1522))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = cl)
)
)
dbcd =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = a66 )(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = cd)
)
)
myx5=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = v55)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = x5)
)
)
i want to get the hostname of a specific service_name or sid. in some cases it is sid and in some cases it is service_name. what should i search with grep in order to get the hostname? In this example i want to get the string "host_name".
****UPDATE****
I ALSO NEED THE db_name2, if someone can help

Answer 1

If perl is available try this command:
perl -nle 'BEGIN{$service = shift}
$host = $1 if /HOST\s*=\s*([^\s\)]+)/i;
print $host if /\((SID|SERVICE_NAME)\s*=\s*$service\)/;
' blabla tnsnames.ora
It stores the last host value found in HOST = ... and prints it when encounters (**SID/SERVICE_NAME** = blabla)

Answer 2

#drf: try:
awk '/HOST/{sub(/).*/,"",$(NF-2));print $(NF-2)}' Input_file
Simply looking for string HOST for each line then substituting the ).* from the 2nd last filed of the line where awk matches the string HOST in it, it should give you host_name then.
EDIT: For looking for a specific SID or service name try:
awk '/HOST/{sub(/).*/,"",$(NF-2));HOST=$(NF-2);next} /SID/{print HOST}'
Change SID with sid or service name which you want to search and it should work then.
EDIT2:
awk '/db_name/{sub(/=/,"",$1);DB=$1}/HOST/{sub(/).*/,"",$(NF-2));HOST=$(NF-2);next} /chumma/{print DB ORS HOST}'
EDIT3:
awk '{gsub(/\)|\(/,"");;for(i=1;i<=NF;i++){if($i=="HOST"){host=$(i+1)};if($NF=="cd"){val="DB_NAME= "$1", HOST_NAME= "host",SID/SERVICE_NAME= "$NF}};if(val){print val;val=""}}' Input_file
OR(non-one liner form of solution too as follows):
awk '{gsub(/\)|\(/,"");
for(i=1;i<=NF;i++){
if($i=="HOST"){
host=$(i+1)
};
if($NF=="cd") {
val="DB_NAME= "$1", HOST_NAME= "host",SID/SERVICE_NAME= "$NF
}
};
if(val) {
print val;
val=""
}
}
' Input_file
You could put "cd"''s place another service or ssid which you want to search too in above code.