How to redirect output from a command ??!!!!!!!!!!!

[Tamer Shaalan]

Hii all professionals...,
I have a certain application command, which when run, collects huge amount of data from a database. I redirect the gained data(in text format) to an ordinary file. but the trick is when this command runs, it prints in the shell some messages ( such as % of progress, number of collected database entries, and so on ), the question is HOW TO REDIRECT THESE MESSAGES to another file other than the file contains data itself ??
Thanx for your interest

[Steven E. Protter]

command >> /tmp/newfile

redirects command output to append /tmp/newfile

command 2>&1 | mailx -s "Subject" someone@aol.com

redirects output to background and then email

The tee command splits output between two files.

SEP

[Tamer Shaalan]

Dear SEP,
thank you first for your fast responce.
really it is :
command > /usr/file1
file1 now contains database entries.
while it is being run, interactive messages are printed in shell.
HOW TO GET THESE MESSAGES in a SEPARATE file ????
if used tee, i will get the database entries again , not messages !!!!!
Tamer

[Rodney Hills]

If the application writes these messages to STDERR, then you can redirect it to /dev/null. example-

command 2>/dev/null >/yourfile

If that is not the case you will need to filter out those lines through sed,awk, or perl. example-

command | sed '/^%/d' >/yourfile

HTH

-- Rod Hills

[Steve Steel]

Hi

If the rogram prints on standard output and the messages as well then forget it

They will go to the same place

If the messages are on standard error
command > /usr/file1 2>otherfile


Only other thing I can think of if both on standard output

command|while read line
do
echo $line|grep -v "%" >> /usr/file1
echo $line |grep "%" >> /usr/file2
done

You will need to extend the greps for all the fields you wnat to move

Steve Steel

[Michael Schulte zur Sur]

Hi,

what database are we talking about?
If it is an oracle script, you can influence, what oracle prints.
Is it a compiled command or do you happen to
have the script for it?
Otherwise, as stated, it is getting nasty.
Perhaps the easiest way would be to filter the data rows with grep, if they have a common structure.

greetings,

Michael

[Peter Nikitka]

Hi,
I'm quite sure, that the status messages are written to stderr. So lets collect the remarks you got till now and try

command 2>&1 >/usr/file1 | tee /tmp/errorlog

to see that status messages AND put it to a file.

For the simple redirct use:
command >/usr/file1 2>/tmp/errorlog

mfG Peter

[Tamer Shaalan]

Many Thanks for everyone who interested in replying to me.
I dicovered it is stdrerr and easily separated by " 2> " .I really gained more experience from all your replies.
Again, Thanks a million for all of you !!

Tamer.

[Michael Schulte zur Sur]

Tamer,

that's what this place is for. ;-)

greetings,

Michael

ps. have you already read this?
http://forums1.itrc.hp.com/service/forums/helptips.do?#28

[Shaikh Imran]

Hi,
To redirect the output to a file
#command > filename
To append the output to a file
#command >> filename


Regards,