topic scripting help in Operating System - Linux

scripting help

Andres_13 — Mon, 23 Jan 2012 17:30:25 GMT

Hi there,

I have the following shell in a RHEL 4 Server:

export DIR=/u01
for dir in `find $DIR -type d`;
do
grep pattern $dir/*;
done

As the above script gives thousands of files I'm looking for help to actually find the pattern and also change it for another string.

Any help will be appreciated

Re: scripting help

Steven Schweda — Mon, 23 Jan 2012 20:00:42 GMT

Re: scripting help with find

Dennis Handly — Mon, 23 Jan 2012 21:05:52 GMT

>As the above script gives thousands of files

1000s of files as in you want to automate it? Or you just want to limit it?

If you have a shell pattern match instead of a grep RE, you can use -name:

DIR=/u01
find $DIR -type f -name "pattern" | while read file; do
# do something with filename ...
done

Re: scripting help with find

Andres_13 — Mon, 23 Jan 2012 21:24:08 GMT

I want to automate it. Let me explain a bit more the current state:

I have just virtualized a production environment (RHEL 4 running oracle application server). It's a production environment for the purpose of making a development environment. It's something I never did before and also I don't know how OAS works.

So I thought it it would be easier to change the virtual server hostname and replace the original server name for the virtual of all files containing the name of the production system.

Answering your question I want to automate the process of find all the files containing the prod server hostname, edit each one of them in order to get all of these files "pointing" to the new virtual server's hostname.

Re: scripting help with find

Andres_13 — Mon, 23 Jan 2012 21:42:48 GMT

Maybe something like this:

for dir in `find $OAS -type d`;
do
FILE=`grep $SOURCE_HOSTNAME $dir/*`;
if [ $FILE ]; then
/bin/cat - << EOF | /bin/ed -s $FILE
1,$ s/$SOURCE_HOSTNAME/$TARGET_HOSTNAME/g
w $FILE
q
EOF
FILE=\0
fi
done

But above doesn't work yet

Re: scripting help with find

Dennis Handly — Tue, 24 Jan 2012 04:50:57 GMT

>find all the files containing the prod server hostname, edit each one of them in order to get all of these files "pointing" to the new virtual server's hostname.

DIR=/u01
find $DIR -type f | while read file; do

fgrep -q "$SOURCE_HOSTNAME" $file

if [ $? -eq 0 ]; then

sed "s/$SOURCE_HOSTNAME/$TARGET_HOSTNAME/g" $file > $file.new &&

mv $file.new $file # permission & ownership possibly changed

done

Re: scripting help with find

Andres_13 — Tue, 24 Jan 2012 15:56:29 GMT

Thank's for your support dennis, that did the trick!.

Regards!