Re: How to pass UNIX variable into awk?

RC wrote:

> myvariable="hello"
> 
> cat my file, if first field match "hello", then print whole line

awk '$1 ~ /hello/' myfile.txt

> I tried
> 
> cat myfile.txt | awk -F: '$1 ~ /$myvariable/ {print $0}'
> 
> but doesn't work, I also tried double $ like $1 ~ /$$myvariable/
> still no luck.
> 
> I did this more than 10 years ago, now I forget the trick.
> If you know, please tell me again.
> Thank Q in advance!

awk -v myvar="hello" '$1 ~ myvar' myfile.txt

-- 
All the commands are tested with bash and GNU tools, so they may use
nonstandard features. I try to mention when something is nonstandard (if
I'm aware of that), but I may miss something. Corrections are welcome.