diff --git a/Library/Homebrew/completions.rb b/Library/Homebrew/completions.rb
index 7b8a8d3f42..0780c48905 100644
--- a/Library/Homebrew/completions.rb
+++ b/Library/Homebrew/completions.rb
@@ -304,7 +304,11 @@ module Homebrew
       return unless command_gets_completions? command
 
       command_description = format_description Commands.command_description(command, short: true), fish: true
-      lines = ["__fish_brew_complete_cmd '#{command}' '#{command_description}'"]
+      lines = if COMPLETIONS_EXCLUSION_LIST.include?(command)
+        []
+      else
+        ["__fish_brew_complete_cmd '#{command}' '#{command_description}'"]
+      end
 
       options = command_options(command).sort.filter_map do |opt, desc|
         arg_line = "__fish_brew_complete_arg '#{command}' -l #{opt.sub(/^-+/, "")}"
diff --git a/Library/Homebrew/completions/bash.erb b/Library/Homebrew/completions/bash.erb
index a9395d3ef3..4f782557ac 100644
--- a/Library/Homebrew/completions/bash.erb
+++ b/Library/Homebrew/completions/bash.erb
@@ -108,7 +108,6 @@ __brew_complete_tapped() {
 
 __brew_complete_commands() {
   # Auto-complete Homebrew commands
-  # Do NOT auto-complete "*instal" aliases for "*install" commands
 
   local cur="${COMP_WORDS[COMP_CWORD]}"
   local cmds
@@ -118,10 +117,10 @@ __brew_complete_commands() {
     cmds=${__HOMEBREW_COMMANDS}
   elif [[ -n ${HOMEBREW_CACHE:-} && -f ${HOMEBREW_CACHE}/all_commands_list.txt ]]
   then
-    cmds="$(< "${HOMEBREW_CACHE}/all_commands_list.txt" \grep -v instal$)"
+    cmds="$(< "${HOMEBREW_CACHE}/all_commands_list.txt")"
   elif [[ -n ${HOMEBREW_REPOSITORY:-} && -f ${HOMEBREW_REPOSITORY}/completions/internal_commands_list.txt ]]
   then
-    cmds="$(< "${HOMEBREW_REPOSITORY}/completions/internal_commands_list.txt" \grep -v instal$)"
+    cmds="$(< "${HOMEBREW_REPOSITORY}/completions/internal_commands_list.txt")"
   fi
   while read -r line; do COMPREPLY+=("${line}"); done < <(compgen -W "${cmds}" -- "${cur}")
   export __HOMEBREW_COMMANDS=${cmds}
diff --git a/Library/Homebrew/completions/fish.erb b/Library/Homebrew/completions/fish.erb
index 383966bb8c..1ec614d909 100644
--- a/Library/Homebrew/completions/fish.erb
+++ b/Library/Homebrew/completions/fish.erb
@@ -147,9 +147,9 @@ end
 
 function __fish_brew_suggest_commands -d "Lists all commands names, including aliases"
     if test -f (brew --cache)/all_commands_list.txt
-        cat (brew --cache)/all_commands_list.txt | \grep -v instal\$
+        cat (brew --cache)/all_commands_list.txt
     else
-        cat (brew --repo)/completions/internal_commands_list.txt | \grep -v instal\$
+        cat (brew --repo)/completions/internal_commands_list.txt
     end
 end
 
diff --git a/completions/bash/brew b/completions/bash/brew
index fd983a54fb..1f46df99ad 100644
--- a/completions/bash/brew
+++ b/completions/bash/brew
@@ -95,7 +95,6 @@ __brew_complete_tapped() {
 
 __brew_complete_commands() {
   # Auto-complete Homebrew commands
-  # Do NOT auto-complete "*instal" aliases for "*install" commands
 
   local cur="${COMP_WORDS[COMP_CWORD]}"
   local cmds
@@ -105,10 +104,10 @@ __brew_complete_commands() {
     cmds=${__HOMEBREW_COMMANDS}
   elif [[ -n ${HOMEBREW_CACHE:-} && -f ${HOMEBREW_CACHE}/all_commands_list.txt ]]
   then
-    cmds="$(< "${HOMEBREW_CACHE}/all_commands_list.txt" \grep -v instal$)"
+    cmds="$(< "${HOMEBREW_CACHE}/all_commands_list.txt")"
   elif [[ -n ${HOMEBREW_REPOSITORY:-} && -f ${HOMEBREW_REPOSITORY}/completions/internal_commands_list.txt ]]
   then
-    cmds="$(< "${HOMEBREW_REPOSITORY}/completions/internal_commands_list.txt" \grep -v instal$)"
+    cmds="$(< "${HOMEBREW_REPOSITORY}/completions/internal_commands_list.txt")"
   fi
   while read -r line; do COMPREPLY+=("${line}"); done < <(compgen -W "${cmds}" -- "${cur}")
   export __HOMEBREW_COMMANDS=${cmds}
diff --git a/completions/fish/brew.fish b/completions/fish/brew.fish
index 400284aa51..a5643cd678 100644
--- a/completions/fish/brew.fish
+++ b/completions/fish/brew.fish
@@ -134,9 +134,9 @@ end
 
 function __fish_brew_suggest_commands -d "Lists all commands names, including aliases"
     if test -f (brew --cache)/all_commands_list.txt
-        cat (brew --cache)/all_commands_list.txt | \grep -v instal\$
+        cat (brew --cache)/all_commands_list.txt
     else
-        cat (brew --repo)/completions/internal_commands_list.txt | \grep -v instal\$
+        cat (brew --repo)/completions/internal_commands_list.txt
     end
 end
 
@@ -867,7 +867,6 @@ __fish_brew_complete_arg 'info; and not __fish_seen_argument -l cask -l casks' -
 __fish_brew_complete_arg 'info; and not __fish_seen_argument -l formula -l formulae' -a '(__fish_brew_suggest_casks_all)'
 
 
-__fish_brew_complete_cmd 'instal' 'Install a formula or cask'
 __fish_brew_complete_arg 'instal' -l HEAD -d 'If formula defines it, install the HEAD version, aka. main, trunk, unstable, master'
 __fish_brew_complete_arg 'instal' -l adopt -d 'Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with `--force`'
 __fish_brew_complete_arg 'instal' -l appdir -d 'Target location for Applications (default: `/Applications`)'
@@ -1612,7 +1611,6 @@ __fish_brew_complete_arg 'unbottled' -l verbose -d 'Make some output more verbos
 __fish_brew_complete_arg 'unbottled' -a '(__fish_brew_suggest_formulae_all)'
 
 
-__fish_brew_complete_cmd 'uninstal' 'Uninstall a formula or cask'
 __fish_brew_complete_arg 'uninstal' -l cask -d 'Treat all named arguments as casks'
 __fish_brew_complete_arg 'uninstal' -l debug -d 'Display any debugging information'
 __fish_brew_complete_arg 'uninstal' -l force -d 'Delete all installed versions of formula. Uninstall even if cask is not installed, overwrite existing files and ignore errors when removing files'
@@ -1728,7 +1726,6 @@ __fish_brew_complete_arg 'update-python-resources' -l version -d 'Use the specif
 __fish_brew_complete_arg 'update-python-resources' -a '(__fish_brew_suggest_formulae_all)'
 
 
-__fish_brew_complete_cmd 'update-report' 'The Ruby implementation of `brew update`'
 __fish_brew_complete_arg 'update-report' -l auto-update -d 'Run in \'auto-update\' mode (faster, less output)'
 __fish_brew_complete_arg 'update-report' -l debug -d 'Display any debugging information'
 __fish_brew_complete_arg 'update-report' -l force -d 'Treat installed and updated formulae as if they are from the same taps and migrate them anyway'