reference environment variable in sed 2

[kasparov]

How can I reference an environment variable in sed? e.g. I thought this might work but it doesn't:

DATE=`date +%y%m%d`
echo "Today is " | sed 's/is /is ${DATE}/'

I've tried Google, man sed, O'Reilly, & searching TekTips but haven't been able to find anything.

Thanks, Chris

 

[feherke]

Hi

That is not related to [tt]sed[/tt]. The shell itself is the one who makes the variable expansion. But only in unquoted text and between double quotes ( " ). In texts delimited with single quotes ( ' ) no expansion is performed.

echo "Today is " | sed [red]"[/red]s/is /is ${DATE}/[red]"[/red]

[gray]# or[/gray]

echo "Today is " | sed 's/is /is [red]'"[/red]${DATE}[red]"'[/red]/'

By the way, if you want to append a string with [tt]sed[/tt] :

echo "Today is " | sed 's/$/'"${DATE}"'/'

I assume your reason for involving [tt]sed[/tt] is learning, otherwise you would simply do :

echo "Today is `date +%y%m%d`"

Or

date '+Today is %y%m%d'

Feherke.

http://rootshell.be/~feherke/

 

[kasparov]

Thanks Feherke

Yes - I was trying to learn - what I'm trying to do is more messy, using DATE seemed a clearer way to desribe my problem - which I no longer have!

Chris

 

[stefanwagner]

or just use ddate ...

don't visit my homepage:

http://home.arcor.de/hirnstrom/bewerbung

 

[dstxaix]

Is ddate on AIX with ksh?

I got ksh: ddate: not found

 

[stefanwagner]

I'm sorry - don't know about AIX.
Perhaps you may compile it yourself:

http://freshmeat.net/projects/util-linux/

don't visit my homepage:

http://home.arcor.de/hirnstrom/bewerbung