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# 1  
Old 09-28-2009
tee

Someone recently advised me to use the tee command to write to standard out.

Why would you pipe your commands to
tee -a <filename>
rather than just using
>> <filename>
?

For example:

date|tee -a myfile

seems to be the same as

date >> myfile

Is there a benefit to using tee that I'm not seeing?

Thanks,

Darin
# 2  
Old 09-28-2009
When you need to write a log and put the same data to the tty, then tee is useful.

Plus
Code:
date > t.lis

does not write anything to the tty. All stdout output goes into the file.

A best use of tee is:
Code:
command 2&>1 | tee -a somelog.file

To capture both errors and normal output. This way the person running the script sees what happened. Then support has a log file to refer to as well.
# 3  
Old 09-28-2009
ok. But can't you do the same thing with
Code:
command >> somelog.file 2/&1

?
# 4  
Old 09-28-2009
I think you missed the main point of Jim's statement:

Quote:
When you need to write a log and put the same data to the tty, then tee is useful.
Tee will write to the file and copy the output to the screen.

If you want to write to the file, and not see the output then don't use tee, otherwise do.
# 5  
Old 09-28-2009
Ok. Thanks. That helps me.
# 6  
Old 09-30-2009
mysql -uroot -pPassWord --tee='/root/myquery.txt'

I do always use tee while accessing Mysql database. This helps me to check the output of a sql command when I can not browse the earlier pages using "Page Up".

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