Shell Programming and Scripting

First of all thanks Madhan, i am able to get the output for a single keyword search(listen-port) .If i want to get the data for multiple keyword search what to do?
For eg,

sed -n 's/port-no/&/p' db.xml > example.txt

this works.

But when i try to search for 2 keywords like:-

sed -n 's/port-no/&/dbname/p' db.xml > example.txt

iam getting an error saying :-

"command garbled:"

How to find the data for 2 keywords(port-no and dbname) in the same db.xml?

Madhan, your reply for this..

Here is my shot,

are you interested in all the data points along with the matching data header

something like,

Code:

sudo -u ramdev2 sh -c " sed -n 's/<\(.*\)>\(.*\)\(<\/.*$\)/\1-\2/p' inputfile "

this will give output something like,

Code:

username- ram
password- tttt
port-no- 1000
data1- hhh
data2- ttt

Madhan, Once again thanks i have written a shellscript
which gets the data from various files for a respective
name and append those data's in a sample.txt file. Here it is:-

parseData(){
param="$@"
sudo -u $param ksh -c sed -n 's/data-1/&/p' /home/$param/example.dat >> sample.txt
sudo -u $param ksh -c sed -n 's/data-2/&/p' /home/$param/example1.dat >> sample.txt

}

FILE="names.txt"
if [ ! -f $FILE ]; then
echo "$FILE : does not exists" exit 1
elif [ ! -r $FILE ]; then
echo "$FILE: can not read"
exit 2
fi
exec 3<&0
exec 0< $FILE
while read line
do
parseData $param
done
exec 0<&3

exit 0

I will be passing names.txt as a command line arg.which contains 10 names . Where each of those names have different HOMEDIR from where we can search the file and get the data. My problem is that i know the HOMEDIR of my name jason( /home/jason/). But i dont know the HOMEDIR for other names. So how i can find the HOMEDIR for other names and for there how can search the example.dat and example1.dat(which is common for all names) and get the respective data?
I have used "~" like "~ /example.dat" but it is getting me the HOMEDIR of the current working directory.
How to solve this problem. One more problem is that when this script is invoked twice, the data's for the same name is appended twice because of ">>". I dont need that where i need to delete the file sample.txt (if it exists), each time when the script is invoked so that i will get only the data for partcular name once. Please do provide a solution for this..

Thanks

what is the value that is populated for $param ?

this should be possible from the file /etc/passwd

for each and every user from /etc/passwd file, home directory of the user can be obtained

If you are sure, that sample.txt file should be created afresh each time the script is run.

Add the following in the start of the script, to check if sample.txt exists and if it is
there delete the file, so that new copy of data would be directed to the file

Code:

if [ ! -f sample.txt ]
then
  /bin/rm sample.txt
fi

BTW,

with this,

Code:

sed -n 's/data-1/&/p'

what is the intended effect that you wish to have with the above code ?

Thanks Madhan, the sed line will get the data for the element data-1.
What is the command to get the HOMEDIR values from /etc/passwd. Where i need to set the HOMEDIR in a variable and then pass it to the "sed" command.
Some thing like :-

homedirvalue= "cat /etc/passwd/$HOMEDIR";

Please correct me in this.

Thanks