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I want to read the file "teste", make some "find&replace" and overwrite "teste" with the results. The closer i got till now is:
$cat teste I have to find something This is hard to find... Find it wright now! $sed -n 's/find/replace/w teste1' teste $cat teste1 I have to replace something This is hard to replace... If I try to save to the same file like this:
$sed -n 's/find/replace/w teste' teste or:
$sed -n 's/find/replace/' teste > teste The result will be a blank file...
I know I am missing something very stupid but any help will be welcome.
UPDATE: Based on the tips given by the folks and this link: http://idolinux.blogspot.com/2008/08/sed-in-place-edit.html here's my updated code:
sed -i -e 's/find/replace/g' teste 
638
Your sed command only sends its result to the standard output. You would have to redirect it in a subsequent command (NOT in the same command, like sed 'sedcommand' file > file , as this would erase the file before processing it).
'g' option is used in `sed` command to replace all occurrences of matching pattern. Create a text file named python.
There is a huge pool of commands available for Ubuntu and sed command utility is one of them; the sed command can be used to perform fundamental operations on text files like editing, deleting text inside a file.
On Linux, sed -i is the way to go. sed isn't actually designed for in-place editing, though; historically, it's a filter, a program which edits a stream of data in a pipeline, and for this usage you would need to write to a temporary file and then rename it.
The reason you get an empty file is that the shell opens (and truncates) the file before running the command.
71
You want: sed -i 's/foo/bar/g' file
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