Re: [bug-gawk] gawk deal with file separator

[arnold]

Just use the trap command in the shell to remove your temporary files.

Or insert your own spcial delimeter line and look for it in the awk program.

I am not adding any special case code for the ASCII FS character.


Peng Yu <address@hidden> wrote:

> There are case when I need to do some preprocessing of files, but I want to
> avoid temp file. I could do something like this.
>
> awk -f file.awk <(process.sh f1.txt) <process f2.txt) <(printf ‘%s\n’
> f{1,2}.txt)
>
> Note that FILENAME won’t keep original filenames. But I need to know the
> filenames. So I have to pass the filenames in the last ARGV, then I need to
> process it and delete it in BEGIN. All of these are not convenient.
>
> Alternatively, I could have a single stream if awk can support 3 level
> progressing.
>
> for f in f{1,2}.txt; do
> printf “%s$FS” “$f”
> process.sh “$f”
> printf “$FS”
> done | awk -f file.awk
>
> The latter may end up less awk code if the 3 level support is designed
> properly.
>
> On Fri, Sep 13, 2019 at 2:20 AM <address@hidden> wrote:
>
> > Peng Yu <address@hidden> wrote:
> >
> > > Hi,
> > >
> > > ASCII code has the FS (file separator) character. This means that
> > > multiple files can be streamed one after another separated by FS. If
> > > each file still is a TSV, this means that the input stream should have
> > > three levels. But gawk only consider the input stream of two levels.
> > > What is the best way to process the input with files separated by FS
> > > in ASCII? Thanks.
> > >
> > > --
> > > Regards,
> > > Peng
> >
> > I really don't understand what you're trying to do or why you
> > want to separate files by FS.
> >
> > Awk already gives you the tools to know when a file boundary
> > has been crossed. Read the manual to learn about FNR and FILENAME.
> > Additionally, gawk gives you BEGINFILE and ENDFILE patterns.
> >
> > I see no need to add special handling to gawk for the ASCII FS character;
> > it's not used for that purpose in any modern (or even ancient) system
> > that  I know of.
> >
> > Nor do I even know *how* I'd add such support.
> >
> > Arnold
> >
> -- 
> Regards,
> Peng