Very unusual errors of a number of kinds:

1. Working brew set up c-ares fails with command not discovered, seemingly not even executing brew:

   $ brew set up c-ares
   -bash: brew set up c-ares: command not discovered
   

   But brew set up cmake executes brew as anticipated:

   $ brew set up cmake
   Warning: Treating cmake as a method. For the cask, use homebrew/cask/cmake
   Warning: cmake 3.25.1 is already put in and up-to-date.
   To reinstall 3.25.1, run:
     brew reinstall cmake
   

2. Can not prepend /usr/native/decide/qt5/bin to $PATH with the error No such file or listing:

   $ export PATH=/usr/native/decide/qt5/bin:$PATH
   -bash: export PATH=/usr/native/decide/qt5/bin:/usr/native/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/usr/native/MacGPG2/bin:/decide/X11/bin:/Library/Apple/usr/bin: No such file or listing
   

   That folder does exist:

   $ [ -d /usr/local/opt/qt5/bin ] && echo "exists"
   exists
   

   As do all of the others on $PATH:

   $ echo $PATH
   /usr/native/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/usr/native/MacGPG2/bin:/decide/X11/bin:/Library/Apple/usr/bin
   $ for i in $(echo $PATH | awk -F: '{for (i=1; i<=NF; i++) { print $i; }}'); do if [ -d "$i" ]; then echo "$i exists"; else echo "$i doesn't exist"; fi; performed
   /usr/native/bin exists
   /System/Cryptexes/App/usr/bin exists
   /usr/bin exists
   /bin exists
   /usr/sbin exists
   /sbin exists
   /Library/TeX/texbin exists
   /usr/native/MacGPG2/bin exists
   /decide/X11/bin exists
   /Library/Apple/usr/bin exists
   

   But including /tmp works:

   $ export PATH=/tmp/:$PATH
   $ echo $PATH
   /tmp/:/usr/native/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/usr/native/MacGPG2/bin:/decide/X11/bin:/Library/Apple/usr/bin
   

3. Similar errors with zsh:

   $ zsh
   % brew set up c-ares
   zsh: command not discovered: brew set up c-ares
   % brew set up cmake
   Warning: Treating cmake as a method. For the cask, use homebrew/cask/cmake
   Warning: cmake 3.25.1 is already put in and up-to-date.
   To reinstall 3.25.1, run:
     brew reinstall cmake
   % export PATH=/usr/native/decide/qt5/bin:$PATH
   zsh: no such file or listing: export PATH=/usr/native/decide/qt5/bin:/tmp/:/usr/native/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/usr/native/MacGPG2/bin:/decide/X11/bin:/Library/Apple/usr/bin
   

I am fairly baffled and do not know how you can debug shell built-ins.

Nothing involves thoughts of what lately modified that might trigger this. I upgraded to Ventura 13.1 at present hoping this could go away, however it was taking place earlier than the improve and continues to occur.

I attempted restarting and it did not assist.

System data:

% system_profiler SPSoftwareDataType SPHardwareDataType | grep -v -e UUID -e UDID -e 'Consumer Title' -e 'Laptop Title' -e Serial
Software program:

    System Software program Overview:

      System Model: macOS 13.1 (22C65)
      Kernel Model: Darwin 22.2.0
      Boot Quantity: MainDisk
      Boot Mode: Regular
      Safe Digital Reminiscence: Enabled
      System Integrity Safety: Disabled
      Time since boot: 22 minutes, 2 seconds

{Hardware}:

    {Hardware} Overview:

      Mannequin Title: MacBook Professional
      Mannequin Identifier: MacBookPro15,1
      Processor Title: 6-Core Intel Core i7
      Processor Pace: 2.6 GHz
      Variety of Processors: 1
      Complete Variety of Cores: 6
      L2 Cache (per Core): 256 KB
      L3 Cache: 9 MB
      Hyper-Threading Know-how: Enabled
      Reminiscence: 16 GB
      System Firmware Model: 1916.60.2.0.0 (iBridge: 20.16.2059.0.0,0)
      OS Loader Model: 564.40.4~55
      Activation Lock Standing: Enabled