SUMMARY: Using variables in sed
2007-12-25 5:41:00
to use double quotes around the sed script rather than single quotes, as
in the following.
Sed -e "s/HOST/$HOST/g" > filename
Very simple but so elusive!
Thanks again!
-----Original Message-----
From: codeprof-bounces at codeprof.com
[mailto:codeprof-bounces at codeprof.com] On Behalf Of Cohen,
Laurence
Sent: Wednesday, January 04, 2006 9:42 AM
To: codeprof at codeprof.com
Subject: Using variables in sed
Hello everyone!
Would anyone have a hint as to how to use a variable from the OS in sed?
For example, I want to be able to substitue the hostname of a system for
every instance of the word HOST in a file. I set the variable
$HOST=`hostname` and then run sed -e 's/HOST/$HOST/g' > filename. The
result of this is that it substitutes the string "$HOST" instead of it's
value. I even tried sed -e 's/HOST/`echo $HOST`/g' > filename, and the
result is that it substitutes the string "`echo $HOST`, which is also
not what I want. How do I get sed to understand that I'm referring to a
variable and not a string?
Thanks!
Laurence H. Cohen
ISM Unix System Administrator
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