topic Re: sed question, tricky one in Operating System - HP-UX

sed question, tricky one

Mike_Ca Li — Mon, 06 Jun 2005 14:36:22 GMT

I am trying to get from a general sed command to get the first line up to the line containing a regexp like below:
sed -e '1,/${variable}/!d'
but it does not satisfy the condition when the ${variable} is part of the first line.
Could someone please comment and recommend a fix. Thank you.

Re: sed question, tricky one

Rodney Hills — Mon, 06 Jun 2005 15:14:45 GMT

You could do the following with perl-

perl -n -e 'print if 1../abc/' yourfile

HTH

-- Rod Hills

Re: sed question, tricky one

Rodney Hills — Mon, 06 Jun 2005 15:16:14 GMT

Oops, here it is with ${variable}-

perl -n -e "print if 1../${variable}/" yourfile

-- Rod Hills

Re: sed question, tricky one

Mike_Ca Li — Mon, 06 Jun 2005 15:21:58 GMT

Thanks for reply. I guess that it can't be done with sed?

Re: sed question, tricky one

A. Clay Stephenson — Mon, 06 Jun 2005 15:31:37 GMT

One thing needs to be made very clear. Are you looking explicitly for ${variable} or aou looking for the instantiation of ${variable}? Note that instantiation will not take place within single quotes but will within double quotes so that your problem may be a shell rather than sed problem.

Re: sed question, tricky one

Mike_Ca Li — Mon, 06 Jun 2005 15:51:20 GMT

Hi:
There was a typo, the sed line should be:
sed -e '1,/'${variable}'/!d' filename
or
sed -e '1,/"${ckpoint}"/!d'
But here is what I don't understnad. The content of filename:
---start---
2005011211.zip
2004201004.zip
2005012004.zip
2005011950.zip
2005013102.zip
---end---

sed -e 1,/2005011211.zip/!d filename will return all the 5 lines which is rather strange.
sed -e /2005013102.zip/!d will only return
2004201004.zip

The perl -n -e 'print if 1../2005011211.zip/' will return 2005011211.zip

Is that a sed issue? Thanks

Re: sed question, tricky one

Muthukumar_5 — Tue, 07 Jun 2005 00:08:40 GMT

You can try as,

------test.log---------
2005011211.zip
2004201004.zip
2005012004.zip
2005011950.zip
2005013102.zip

Execution to print from 1st line to 2005011950.zip as,

# sed -n '{1,/2005011950.zip/p;}q' test.log

It will do it.

hth.

Re: sed question, tricky one

Muthukumar_5 — Tue, 07 Jun 2005 00:09:32 GMT

You can also try as,

# sed -e '{1,/2005012004.zip/!d;}q' test.log for printing from 1 to 2005012004.zip pattern.

hth.

Re: sed question, tricky one

Mike_Ca Li — Wed, 08 Jun 2005 20:38:44 GMT

$ sed -e '{1,/2005012004.zip/!d;}q' test.log
sed: -e expression #1, char 24: Extra characters after command

$ sed -e '{1,/2005012004.zip/!d;}' test.log
2005011211.zip
2004201004.zip
2005012004.zip

$ sed -e '{1,/200501121.zip/!d;}' test.log
2005011211.zip
2004201004.zip
2005012004.zip
2005011950.zip
2005013102.zip

That was not I was looking for. Thanks for trying. I'll go with the perl solution

Re: sed question, tricky one

vinod_25 — Sat, 18 Jun 2005 03:31:36 GMT

hi mike

here is the portion of a output from man sed

Same as above but use shell or environment variables var1 and var2 in
search and replacement strings:

sed "s/$var1/$var2/" file1 >file1.out

or

sed 's/'$var1'/'$var2'/' file1 >file1.out

Multiple substitutions in a single command:

hope it sprays some light to your query...

Regards

Vinod K