sed command question

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June 24th, 2004, 01:12 PM

boxingcat

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sed command question

Hi, everybody,

I tried to use a shell script to do a for loop:
#!...bash
for i in (5, 10, 15, 20) do;
sed 's/bpp=64/bpp=$i/g' myfile.c > myfile2.c
~~
done

However, each time it executes, "bpp=64" becomes "bpp=$i" instead of
"bpp=5" ......

I have no idea how to make the $i inside sed command to be a real variable.
Anybody has a suggestion for it?

Thanks a lot!

June 24th, 2004, 01:40 PM

stevengs

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hi,

for variables double quote, for wyswyg characters single quote. Concatenate when both are present:

Code:

#if there were regular ocurrences of $ you could concatenate:

sed  's/bpp=64/bpp='"$i/g"  myfile.c  >  myfile2.c 


#if you only use $ for variables, just double quote:

sed  "s/bpp=64/bpp=$i/g"  myfile.c  >  myfile2.c

-Steven
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