sed command question Post: 302825989

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Top Forums Shell Programming and Scripting sed command question Post 302825989 by alister on Tuesday 25th of June 2013 03:31:48 PM

06-25-2013

Registered User

Quote:

Originally Posted by Scrutinizer

Hi, this section..

Code:

`awk -F, -f sed.awk sednumbers`

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:

Code:

$ sed '/KWName/a\
> '"`awk -F, -f sed.awk sednumbers`"'' sedtest.txt
Unrecognized command: <entry name="KWValue2">21*</entry>

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.

Regards,
Alister

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