[9fans] quouteing(?) problems in rc

[9fans] quouteing(?) problems in rc

[Bengt Kleberg]

Greetings,

I am using rc from plan9port on Linux and I am trying to construct a grep
command. This is what I have so far:

	file = nibsRouteMib.erl
	func = create_ok
	echo		grep -n -e '''' ^  '^' ^ $func ^ '''' $file /dev/null
	grep -n -e '''' ^  '^' ^ $func ^ '''' $file /dev/null

The echo is only there to test what the command looks like. If I run
the above lines I get:

grep -n -e '^create_ok' nibsRouteMib.erl /dev/null
file: exit 1


If I run the line I got from the echo (grep -n -e '^create_ok'
nibsRouteMib.erl /dev/null) I get:

nibsRouteMib.erl:522: create_ok( Row_index, _Columns ) ->


Since the echo'ed line works fine but not the very similar line below, I
must have made a mistake somewhere and wonder if somebody can spot it and
tell me?


bengt

-- 
Those were the days...
   EPO guidelines 1978: "If the contribution to the known art resides
   solely in a computer program then the subject matter is not
   patentable in whatever manner it may be presented in the claims."

Re: [9fans] quouteing(?) problems in rc

[roger peppe]

>         grep -n -e '''' ^  '^' ^ $func ^ '''' $file /dev/null

your problem is that you're constructing a list containing quotes
suitable for input to the shell, but you really want to construct
a list containing values suitable for arguments to grep.
i think what you want is:

grep -n -e '^'^$func $file /dev/null

which of course will only work correctly if $func contains no
regexp metacharacters, but i'm sure you know that.