topic Re: sed question in Operating System - HP-UX

sed question

John McWilliams — Wed, 07 Feb 2001 02:48:28 GMT

Hi All - I have a file that I want to add a line into. This line needs to be added after the line starting with the word "History".
I believe sed can do this but I cant figure out how to get it to work. Any ideas would be appreciated.
thanks John

Re: sed question

Steven Sim Kok Leong — Wed, 07 Feb 2001 03:52:38 GMT

Hi,

Your task can be accomplished easily with perl:

==
[root@cc0070 /root]# cat infile
abc
History
def
History abcdef abcdef
abc
abc
a History a b c d e
b History a b c d e
[root@cc0070 /root]# ./testperl
[root@cc0070 /root]# cat outfile
abc
History
INSERTED_TEXT
def
History abcdef abcdef
INSERTED_TEXT
abc
abc
a History a b c d e
b History a b c d e
You have new mail in /var/spool/mail/root
[root@cc0070 /root]# cat testperl
#!/usr/bin/perl

open (INFILE, "infile");
open (OUTFILE, ">outfile");
while ()
{
$_ =~s/^History(.*)/History\1\nINSERTED_TEXT/g;
print OUTFILE $_;
}
==

Hope this helps. Regards.

Steven Sim Kok Leong
Brainbench MVP for Unix Admin
http://www.brainbench.com

Re: sed question

Bruce Regittko_1 — Wed, 07 Feb 2001 03:53:42 GMT

Hi,

To add 3 lines after all lines that begin with History:

sed -e '/^History/aline to add #1line to add #2line to add #3' file

Note the single quotes and the backslashes \. They are important.

If you have multiple History lines and only want to append after the first, it gets more complex and requires two sed commands (at least by me - sed gurus may be able to do it in one command).

sed -e '/^History/aline to add #1line to add #2line to add #3' -e '/^History/d' file > file.tmp

sed -e '1,/^History/d' file >> file.tmp

Disclaimer: I read the HP man pages but tested this on a Linux box. It *should* work on HP-UX.

--Bruce

Re: sed question

Bruce Regittko_1 — Wed, 07 Feb 2001 04:07:24 GMT

Hi again,

Arrrgghh! Apparently the reply interface doesn't handle lines ending in a backslash well. The correctly formatted sed commands are in the attachment.

--Bruce

Re: sed question

Tommy Palo — Wed, 07 Feb 2001 09:05:20 GMT

You can also do this with 'ed':

#!/usr/bin/ksh
cat - << EOF | ed -s file_to_edit
/History
+1
i
New Line of text
.
w
q
EOF