4 ms·

Have you never tried it? % cat > foo fred barney wilma betty % < foo > bar % cat bar fred barney wilma betty %

Have you never tried it? % cat > foo fred barney wilma betty % < foo > bar % cat bar fred barney wilma betty % diff foo bar %

ddingus 4y ago
interesting! TIL
- cestith 4y ago
  If you look at https://news.ycombinator.com/item?id=33334043 https://news.ycombinator.com/item?id=33334043 it turns out rascul was right and it appears to be only zsh that handles the reading of the redirected input without some other command to hand it off to.
  - ddingus 4y ago
    I saw all that. Still, was interesting. I just happened to explore this on an M1, so I had a shell that would do things this way.
rascul 4y ago
I wasn't able to do that with bash. Not at the computer now though so I can't try it again to see if I had screwed it up. Update: Back at the computer now, and I cannot replicate it with bash: rascul@smarts:~/mm> cat > foo fred barney wilma betty rascul@smarts:~/mm> < foo > bar rascul@smarts:~/mm> cat bar rascul@smarts:~/mm> I'm curious what shell you did that with.
- cestith 4y ago
  That's in zsh. Yeah, I guess there are shells where it won't work.
  - rascul 4y ago
    I think it's a zshism. I can't seem to do it in dash either.
    - cestith 4y ago
      I've since tried in two versions of Bash (3.2 and 5.1) and in five different varieties of ksh (oksh, mksh, ksh93, pdksh, GNU ksh). It does seem to be a zshism. All the others do the redirect into the destination, but only zsh provides the content of the redirect from source without some other command to read it. The zsh way seems more properly fitting with the philosophy of the Unix shell to me. It would be an uphill battle getting everyone else to change that behavior, though.
      - rpigab 4y ago
        I've been using this for a long time now and I didn't know if what a zshism because it felt so simple to use and Unixy, TIL too, thanks!

Have you never tried it? % cat > foo fred barney wilma betty % < foo > bar % cat bar fred barney wilma betty % diff foo bar %

ddingus 4y ago

interesting! TIL

cestith 4y ago
If you look at https://news.ycombinator.com/item?id=33334043 https://news.ycombinator.com/item?id=33334043 it turns out rascul was right and it appears to be only zsh that handles the reading of the redirected input without some other command to hand it off to.
- ddingus 4y ago
  I saw all that. Still, was interesting. I just happened to explore this on an M1, so I had a shell that would do things this way.

rascul 4y ago

I wasn't able to do that with bash. Not at the computer now though so I can't try it again to see if I had screwed it up. Update: Back at the computer now, and I cannot replicate it with bash: rascul@smarts:~/mm> cat > foo fred barney wilma betty rascul@smarts:~/mm> < foo > bar rascul@smarts:~/mm> cat bar rascul@smarts:~/mm> I'm curious what shell you did that with.

cestith 4y ago
That's in zsh. Yeah, I guess there are shells where it won't work.
- rascul 4y ago
  I think it's a zshism. I can't seem to do it in dash either.
  - cestith 4y ago
    I've since tried in two versions of Bash (3.2 and 5.1) and in five different varieties of ksh (oksh, mksh, ksh93, pdksh, GNU ksh). It does seem to be a zshism. All the others do the redirect into the destination, but only zsh provides the content of the redirect from source without some other command to read it. The zsh way seems more properly fitting with the philosophy of the Unix shell to me. It would be an uphill battle getting everyone else to change that behavior, though.
    - rpigab 4y ago
      I've been using this for a long time now and I didn't know if what a zshism because it felt so simple to use and Unixy, TIL too, thanks!