so I've been experimenting with SED today, no experience before today, so if you're not patient, stop reading now! :P
I will attempt to explain this as simply as possible, without having to post massive walls of shitty code. Basically, I've created a small sed script to go through an XML document and append lines of XML after certain other lines. However, I've run into a slight glitch when I tried to nest an awk statement inside a sed statement.
My sed script is
This awk script generates the following output:
, which is what I want appended (and no, it's not nice and static, this is just for testing purposes). The awk script executes fine and generates the right output, but then at the top of my output I get
and it only inserts the first <entry as the newline. Clearly it is reading the spaces as meaning this is a seperator between two files. How can I correct that?
For posterity's sake, the output I'm getting is
and the output I want is
Hi, this section..
is unprotected by double quotes, so the shell will interpret the < and > signs as redirects from / to files
I think your analysis is incorrect. The shell scans for redirection operators before any expansions occur.
It looks to me like field splitting ends the sed script immediately following the first word of the command substitution, <entry. Everything that follows in the command substitution is passed to sed as separate arguments which sed treats as filenames. I believe this is the source of the error messages (I don't have a shell handy to confirm).
Quote:
Originally Posted by Parrakarry
Hmm. Can you explain a little more how I would protect it with double quotes? The three ways I tried gave me:
Or is there a way I can do it without requiring the `? That last one seems to be closer to what I'm looking for, at least.
That is the correct way to do what you're trying to do. The problem is that newlines within the text argument to sed's a command must be backslash escaped. Since they're not, sed considers the text to end at the first newline. sed then tries to parse the second line of awk output as a sed command.
I think your analysis is incorrect. The shell scans for redirection operators before any expansions occur.
It looks to me like field splitting ends the sed script immediately following the first word of the command substitution, <entry. Everything that follows in the command substitution is passed to sed as separate arguments which sed treats as filenames. I believe this is the source of the error messages (I don't have a shell handy to confirm).
He, he you are right, already had a gnawing feeling when I posted it .. At any rate the double quotes would be required ..
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