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getline with different FS
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| jujubi 2005-11-08, 6:55 pm |
| Does anyone know how to specify a different field separator for awk
getline ?
some thing like this..
awk 'BEGIN{FS=" ";}{
yada yada yada..
while..
getline myvar < file2
....
close file2
}' file1
i want to read file1 with FS "<space>" and file2 with FS "-", how to
accomplish that.
Here is what is wrong if the second file has a line like below
abc-ky whlhs sd sags sgsg sagf gf-sdalsg sg s sgs-sag
myvar has abc-ky whlhs sd sags sgsg sagfgf-sdalsg sg s sgs-sag
ie: the spaces are trimed and i dont want that.
Thanks inadvance for all suggestions & comments..
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| Ed Morton 2005-11-08, 6:55 pm |
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jujubi wrote:
> Does anyone know how to specify a different field separator for awk
> getline ?
Using getline is almost always the wrong solution.
> some thing like this..
>
> awk 'BEGIN{FS=" ";}{
The above sets FS to it's default setting. You don't need to do that.
> yada yada yada..
>
> while..
> getline myvar < file2
The above is the wrong way to use getline in this context. It should be:
if ((getline myvar < file2) > 0) ...
> ...
> close file2
>
> }' file1
>
> i want to read file1 with FS "<space>" and file2 with FS "-", how to
> accomplish that.
Just set the FS to "-" between the 2 files, e.g.
awk '{print $1}' file1 FS="-" file2
> Here is what is wrong if the second file has a line like below
>
> abc-ky whlhs sd sags sgsg sagfgf-sdalsg sg s sgs-sag
>
> myvar has abc-ky whlhs sd sags sgsg sagfgf-sdalsg sg s sgs-sag
> ie: the spaces are trimed and i dont want that.
No they aren't. Using getline into a variable from a file as you're
doing has no effect on $0 or any positional parameters or any other
built-in variables and the FS setting has no effect.
>
> Thanks inadvance for all suggestions & comments..
>
If you post some sample input and output, you could get more help....
Ed.
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| jujubi 2005-11-09, 6:55 pm |
| Ed,
Thanks awk '{print $1}' file1 FS="-" file2 solved my purpose.
[color=darkred]
>No they aren't. Using getline into a variable from a file as you're
>doing has no effect on $0 or any positional parameters or any other
>built-in variables and the FS setting has no effect.
You are right, my mistake.
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