Interactive Sed script

I need to write a script that uses a command line argument as part of the sed command. It will be easier to show:
sed -n '/$1/ p' file.  Wat do I use as a delimiter for the $1 argument?
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I don't think you need to delimit the argument (not in your example above anyway), but if you need to, try putting ${1} instead of $1.

NOTE: If you want your example above to work, you might want to:
1. Remove the "-n" so you get output.
2. Add a "/" after the "p" so the replacement string is delimitted.

Let me know how you get on.

PS: What's an example were you need to delimit the argument?

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tel2, did you get used to sdickens' example?
sdickens, is your example from within a script?
What do you mean by "get used to"?  Are you asking if I understand it, or what?
If you put the '$1' argument inside a single apices delimited string the shell will not expand it just before calling sed.

modify your command as follows:
sed -n "/$1/p" file

so that the shell expands $1 with it's actual value before calling sed.

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