SED command problem

vikasumit · 07-04-2006, 08:14 AM

Hi,

I was installing frontpage on centos 3.6 and it works fine. But when I try to run same Shell script on Centos 4.3 it doesn't.

The reason for it is

/usr/sbin/apachectl -v | sed 's%^.*Apache/\([0-9\.]*\).*%\1%' | head -1

when I run this command in Centos 3.6 it give me output as My Apache Version (i.e. 2.0.46)

but on Centos it doesn't return any thing where as it should return 2.0.52 (my apache version )

Any idea how to edit this command to pick value as I never work with sed or awk

Thanks

spirit receiver · 07-04-2006, 08:23 AM

Maybe you should post the first line of output from "/usr/sbin/apachectl -v".

jschiwal · 07-04-2006, 08:28 AM

Code:

# apache2ctl -v
Server version: Apache/2.2.0
Server built:   May  2 2006 08:51:26

apache2ctl -v | sed  -n '1s/^.*Apache\/\([0-9\.]*\)$/\1/p'
2.2.0

vls · 07-04-2006, 08:28 AM

Does apachectl -v even give you the version number, mine doesn't.

Try httpd -v | with-your-sed-script This worked on my machine.

vikasumit · 07-04-2006, 11:47 PM

Hi,

Sometime life is what you never thing it off ..

Thanks vls for solution ...

I never imagine that output of httpd -v is different from /usr/sbin/apachectl -v in any way specially when i do this

Code:

[root@DS00255 ~]# /usr/sbin/apachectl -v
Server version: Apache/2.0.52
Server built:   Oct  7 2005 06:37:35

Code:

[root@DS00255 ~]# httpd -v
Server version: Apache/2.0.52
Server built:   Oct  7 2005 06:37:35

Not a single space difference in output but yes

Code:

[root@DS00255 ~]# /usr/sbin/apachectl -v | sed 's%^.*Apache/\([0-9\.]*\).*%\1%' | head -1

return nothing and

Code:

[root@DS00255 ~]# httpd -v | sed 's%^.*Apache/\([0-9\.]*\).*%\1%' | head -1
2.0.52

Does the work ..

Though my problem is solved but any reason of this difference ?

spirit receiver · 07-05-2006, 05:20 AM

Maybe there's some invisible difference? Try piping the ouput of both commands through "hexdump -c".

vikasumit · 07-05-2006, 11:48 PM

Hi,

I guess i don't know exact use of hexdump

...but seems I go my answer anyways

I run these commands
hexdump -c </usr/sbin/httpd -v
hexdump -c </usr/sbin/apachectl -v

And they output totally different from each other and what I got from them without hexdump ...

spirit receiver · 07-06-2006, 02:55 AM

Quote:

Originally Posted by vikasumit

And they output totally different from each other

No doubt about that, you're comparing the binary code of two different programs. Try the following instead:

Code:

/usr/sbin/httpd -v | hexdump -c
/usr/sbin/apachectl -v | hexdump -c

BTW, I realized that I also have these programs installed (or ar least something called /usr/sbin/apache2ctl). They return the same information here, and both work with your sed command.

vls · 07-06-2006, 12:33 PM

Quote:

Originally Posted by spirit receiver

No doubt about that, you're comparing the binary code of two different programs. Try the following instead:

Code:

/usr/sbin/httpd -v | hexdump -c
/usr/sbin/apachectl -v | hexdump -c

BTW, I realized that I also have these programs installed (or ar least something called /usr/sbin/apache2ctl). They return the same information here, and both work with your sed command.

apachectl is just a shell script wrapper around httpd.
Why the output would come out different called either way is beyond me.