[Bug 6884] the sed applet behaves erraticaly when script from file (option -f)

bugzilla at busybox.net bugzilla at busybox.net
Fri Feb 21 13:38:12 UTC 2014


Denys Vlasenko <vda.linux at googlemail.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Denys Vlasenko <vda.linux at googlemail.com> 2014-02-21 13:38:12 UTC ---
(In reply to comment #0)
> Created attachment 5240 [details]
> tarball of the web extraction used as sample to reproduce the bug
> context (used as bash for the shell and sed for the operations) :
> BusyBox v1.23.0-TIG-1381-g883817e (2014-01-21 14:06:02 GMT) multi-call binary.
> i perform a succession of transformations with bb's sed on a given file (see
> attached for a sample).
> 1. on the command line :
>     $ cat samp.htm | sed -r "/sens=achat/! d; s/^[^<]*<//g; s/<tr /\n&/g" | sed
> -r "s/.*symbole=([^']*)' title=([^>]*)[^<]*<\/a><\/td>/\"\1\";\2;/g"
>   works as expected.
> 2. and i want to do the same via a sed file :
>     $ cat samp.htm | sed -rf f2.sed
> where f2. contains the following (without the line numbering):
>   1-      /sens=achat/! d
>   2-      s/^[^<]*<//g; s/<tr /\n&/g
>   3-      s/.*symbole=([^']*)' title=([^>]*)[^<]*<\/a><\/td>/\"\1\";\2;/g
> but it seems that the script doesn't go beyond line 2 (as if, for the cli
> version, the last pipe was skipped!)

(You need to stop escaping \" in the file version. IOW: \"\1\"  should be  "\1"

For me the script doesn't work as if line 3 is missing. The output is different
from that too.

However: without going deeper into what the scripts are doing, I tried
GNU sed version 4.2.1 on them too, and it and busybox sed gave exactly
the same results on both your testcases.


sed -r \
  -e "/sens=achat/! d; s/^[^<]*<//g; s/<tr /\n&/g" \
  -e "s/.*symbole=([^']*)' title=([^>]*)[^<]*<\/a><\/td>/\"\1\";\2;/g"

that is, single process instead of two seds piped, works the same as the
version with -f FILE.

I guess you are inserting \n chars to break lines and expect sed to detect
those as new lines to operate one. This doesn't work.

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