[solved] bash: patch: command not found

[Onsemeliot]

Sorry, for asking such a probably very trivial question but I am stuck and so far I am unable to find an answer.

I want to apply a patch to a free cpp project I am helping out with as a designer. Somebody provided a .patch file and I expected it would be easy to just do: "$ patch < file.patch" if I am in the right folder on Debian stable. But I get "bash: patch: command not found" as a result and I can't find "patch" as a package in Debian either. So far I was unable to find any hint how I could actually use the patch command on Debian. Everywhere it just seems to be assumed that the patch command works out of the box. Obviously I am missing something here. Can anyone enlighten me?

[p.H]

The "patch" command is provided by the "patch" package.
Are your package sources configured properly ?

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apt-cache policy patch

[Onsemeliot]

Thank you for you quick reply, p.H. I don't know of any oddness in my sources:

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# apt-cache policy patch
patch:
  Installed: (none)
  Candidate: 2.7.6-3+deb10u1
  Version table:
     2.7.6-3+deb10u1 500
        500 http://deb.debian.org/debian buster/main amd64 Packages
        500 http://security.debian.org/debian-security buster/updates/main amd64 Packages

But I now successfully ran the command "apt install patch" and it worked. Even if I didn't find the patch package beforehand. Thank you anyway.

[Dai_trying]

I install command-not-found on a fresh installation and then after running "apt-file update" and "update-command-not-found" I will get some useful information when I try to run a command that doesn't appear to be found, this is also useful for trying to use a command that needs root privileges.

Example #1

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dai@somemachine:~$ foo

Command 'foo' not found, did you mean:

  command 'fop' from deb fop
  command 'fio' from deb fio
  command 'goo' from deb goo

Try: sudo apt install <deb name>

Example #2

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dai@somemachine:~$ blkid
Command 'blkid' is available in the following places
 * /sbin/blkid
 * /usr/sbin/blkid
The command could not be located because '/usr/sbin:/sbin' is not included in the PATH environment variable.
This is most likely caused by the lack of administrative privileges associated with your user account.
blkid: command not found