5 ms·

I'm in no way advocating for curl | bash, but one way to defeat the detection would be to use "sponge" from moreutils[1]. curl "https://example.com/install

I'm in no way advocating for curl | bash, but one way to defeat the detection would be to use "sponge" from moreutils[1]. curl "https://example.com/install" | sponge | bash [1] https://manpages.debian.org/testing/moreutils/sponge.1.en.html https://manpages.debian.org/testing/moreutils/sponge.1.en.ht...

m463 6y ago
it's like half of tee
- steerablesafe 6y ago
  I don't think tee buffers all its input before writing to its outputs.
lqet 6y ago
> This allows constructing pipelines that read from and write to the same file. TIL, how did I not know about sponge before?
- OskarS 6y ago
  sponge rules, but you need to be careful. Lets say you wanted to search/replace a file with sed and sponge, then this does not work: cat file.txt | sed "s/a/b/g" | sponge > file.txt Because bash opens file.txt for writing and truncates it immediately, so "cat file.txt" wont output anything. You have to do this for it to work: cat file.txt | sed "s/a/b/g" | sponge file.txt sponge wont open the file for writing until it's sponged everything up. If you remember this, sponge is an awesome tool in the UNIX toolbox.
  - bonoboTP 6y ago
    Of course with sed you'd use the -i flag.
    - jniedrauer 6y ago
      Unless you're on MacOS, in which case it's -i''. I always have to rewrite cross platform scripts at least once.
      - dwheeler 6y ago
        Right. The sed -i option is incompatible between MacOS & Linux, and it isn't in the POSIX standard. The POSIX folks don't want to add it because it's possible to do work without it, even though no one wants to. Maybe sponge should be in the POSIX standard.
        waynesonfire 6y ago
        I ran into this on FreeBSD. I do have gnu sed and other gnu utilities installed on my Mac to help me feel more at home.
  - knome 6y ago
    This doesn't seem to have any real advantage over just using an intermediate file.
    - OskarS 6y ago
      Of course you can always use an intermediate file, the point is that sponge is a very convenient way to just do it in a single command, without having to use intermediate files. You don't have to use pipes either, you know. You can just save the output from every command to an intermediate file, then run the next command with that file as input.
- steerablesafe 6y ago
  Check out the other moreutils utilities as well, it's a gem. vidir is especially useful with vim, but you can use it with any other text editor.

m463 6y ago

it's like half of tee

steerablesafe 6y ago
I don't think tee buffers all its input before writing to its outputs.

lqet 6y ago

> This allows constructing pipelines that read from and write to the same file. TIL, how did I not know about sponge before?

OskarS 6y ago
sponge rules, but you need to be careful. Lets say you wanted to search/replace a file with sed and sponge, then this does not work: cat file.txt | sed "s/a/b/g" | sponge > file.txt Because bash opens file.txt for writing and truncates it immediately, so "cat file.txt" wont output anything. You have to do this for it to work: cat file.txt | sed "s/a/b/g" | sponge file.txt sponge wont open the file for writing until it's sponged everything up. If you remember this, sponge is an awesome tool in the UNIX toolbox.
- bonoboTP 6y ago
  Of course with sed you'd use the -i flag.
  - jniedrauer 6y ago
    Unless you're on MacOS, in which case it's -i''. I always have to rewrite cross platform scripts at least once.
    - dwheeler 6y ago
      Right. The sed -i option is incompatible between MacOS & Linux, and it isn't in the POSIX standard. The POSIX folks don't want to add it because it's possible to do work without it, even though no one wants to. Maybe sponge should be in the POSIX standard.
      - waynesonfire 6y ago
        I ran into this on FreeBSD. I do have gnu sed and other gnu utilities installed on my Mac to help me feel more at home.
- knome 6y ago
  This doesn't seem to have any real advantage over just using an intermediate file.
  - OskarS 6y ago
    Of course you can always use an intermediate file, the point is that sponge is a very convenient way to just do it in a single command, without having to use intermediate files. You don't have to use pipes either, you know. You can just save the output from every command to an intermediate file, then run the next command with that file as input.
steerablesafe 6y ago
Check out the other moreutils utilities as well, it's a gem. vidir is especially useful with vim, but you can use it with any other text editor.