shell sed -i command

lanssu · 10-05-2013, 12:00 PM

how i used shell "sed -i" command, replace file log,the file has null data in log file ?

druuna · 10-05-2013, 12:31 PM

Quote:

Originally Posted by lanssu

how i used shell "sed -i" command, replace file log,the file has null data in log file ?

The sed -i .... command changes in-place. If, for whatever reason, you make a mistake then the original file is (partially) gone.

You can force sed to make a backup:

Code:

sed -i.bak .....

Even safer would be to make a backup copy of the original file.

bomba · 10-17-2013, 05:01 PM

Hi!
I didn't understand the question.
what do you mean by "replace file log,the file has null data in log file ?"
can you explane the situation ?

Firerat · 10-17-2013, 05:25 PM

since sed is Stream EDitor, there is little point using it on an empty file, nothing to edit.

Give us more context,
what is the full sed command?
what is in the original file?

please use
[code]
your sample data here
[/code]

tags around your sed command, and input data ( what is in the logfile )