topic Re: Strange Issue With sed command in Operating System - HP-UX

Strange Issue With sed command

Amit Dixit_2 — Fri, 11 Nov 2005 21:26:36 GMT

Hi,
We are having a script which gets executed whenever we recieve a file in a particular mailbox and the script is suppose to move the file to another folder and before that It does following processing using sed

sed -e "1,25s/^charset=/ charset=/g" /tmp/${FILENAME} >
/tmp/${FILENAME}.tmp

What I understand from the above command is it is replacing the TAB space from the mail header.

But What is happening is when it processes mail using sed and moves to the folder Intergration Server processes the first document but fails with other files and what we noticed in the header is the success one's and failed once are having different headers.

Can anyone please help.

Thanks,
Amit.

Re: Strange Issue With sed command

James R. Ferguson — Sat, 12 Nov 2005 09:38:53 GMT

Hi Amit:

As written this code processes the first 25-lines (1-25) of /tmp${FILENAME}. If, anchored (^) to the beginning of a line, string "charset=" appears, a space (blank) character is inserted before the string. The output is, including any lines beyond #25 that do not receive substitution is written to /tmp/${FILENAME}.tmp.

There is no TAB character apparent in your post.

Regards!

...JRF...

Re: Strange Issue With sed command

Sandman! — Sat, 12 Nov 2005 15:07:24 GMT

Amit,

JRF is correct, no TAB character in the substitution pattern. Could you clarify the following lines:

>> But What is happening is when it processes mail using sed and moves to the folder Intergration Server processes the first document but fails with other files and what we noticed in the header is the success one's and failed once are having different headers <<

Re: Strange Issue With sed command

Hein van den Heuvel — Sat, 12 Nov 2005 16:18:04 GMT

The forum software mangles spaces and tab, converting any combination of then to a single space.
So if you need to show a tab in this forum, then you'll need to use a numeric representation like the octal 011 or dec 9 for HT, or a control char or the 'od' output with the text. Better still attach a text file with the exact charaters (do NOT cut & paste from screen as again this will mangle tabs)

The sed "1" command can show control characters in the pattern space.
Depending on the shell and such you can enter a true tab only by typing control-v followed by control-i sometimes shown as ^t.
Some versions of sed support \t for TAB or just use that \011

Still... like JRF writes, the command line suggests you are trying to add a space or tab, not replace is. Please clarify. Do you want a tab/spaces added to the output, or removed from the input. In the latter case you'd have to swap the substitue components around (from /x/y/ to /y/x/ )

fwiw,
Hein.

Re: Strange Issue With sed command

Jean-Yves Picard — Mon, 14 Nov 2005 07:10:19 GMT

Hello,

apart from tab problem, you say
>> Server processes the first document but fails with other files

what is value of ${FILENAME} ?

if you have 3 files
maila mailb mailc
and FILENAME="maila mailb mailc"

the result of
sed -XXX ${FILENAME} > ${FILENAME}.tmp
is
sed -XXX maila mailb mailc > maila mailb mailc.tmp

which might not be what you want.
what you want is more likely
FILENAME=$(any command that list files except .tmp files)
for f in ${FILENAME}
do
sed -XXX $f > $f.tmp
done

Jean-Yves

Re: Strange Issue With sed command

Vipin Singhal — Mon, 14 Nov 2005 12:29:57 GMT

Hey Amit,
Are you from BSACET????

Thanks
Vipin

Re: Strange Issue With sed command

Frank de Vries — Thu, 17 Nov 2005 07:07:43 GMT

Hey Vipin
shouldn't that be
ASBECT ?