diff --git a/brew.sh b/brew.sh
index a66bca84b..7fa331563 100755
--- a/brew.sh
+++ b/brew.sh
@@ -1,4 +1,4 @@
-	#!/bin/bash
+#!/bin/bash
 
 # Install command-line tools using Homebrew
 
diff --git a/docs/clearing-disk-space.sh b/docs/clearing-disk-space.sh
deleted file mode 100644
index 549fd87f7..000000000
--- a/docs/clearing-disk-space.sh
+++ /dev/null
@@ -1,41 +0,0 @@
-# won't last long but will give you 1G.
-sudo rm /private/var/vm/sleepimage
-
-# Clean up system logs and temporary files
-#   http://www.thexlab.com/faqs/maintscripts.html
-sudo periodic daily weekly monthly
-
-
-# remove old homebrew versions
-#  https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/FAQ.md#how-do-i-uninstall-old-versions-of-a-formula
-brew cleanup -n  # to see what would get cleaned up
-brew cleanup   # to do it.
-
-cask cleanup
-
-
-~/Library/Caches/Google/Chrome Canary/Default
-~/Library/Caches/Google/Chrome/Default
-
-
-# diskexplorer X is good for big files
-# daisy disk is good for big folders
-
-# XCODE is enormous
-#   kill cache
-rm -rf ~/Library/Caches/com.apple.dt.Xcode
-#   appears that XCode can survive deleting ALL documentation sets!
-~/Library/Developer/Shared/Documentation/DocSets
-/Applications/Xcode.app/Contents/Developer/Documentation/DocSets
-# other simulators can be here.
-/Library/Developer/CoreSimulator/Profiles/Runtimes
-
-# use appcleaner to remove weird shit
-
-emptytrash
-
-# investigate manually - https://dev.yorhel.nl/ncdu
-ncdu ~
-
-# really roll up those sleeves and get dirty
-ncdu /
diff --git a/docs/common-things.sh b/docs/common-things.sh
index 43e9e42d7..e87baa701 100644
--- a/docs/common-things.sh
+++ b/docs/common-things.sh
@@ -1,7 +1,4 @@
-#!/bin/bash
-
-
-
+# shellcheck disable=2148
 
 
 # listing all useragent from your logs
@@ -56,9 +53,9 @@ rm $chromefilename
 
 # measuring time in fish shell:
 
-set -l then (gdate +%s%N); 
-sleep 0.5; 
-set -l andnow (gdate +%s%N);  echo cool (math ( math $andnow - $then) / 1000 / 1000  )
+# set -l earlier (gdate +%s%N); 
+# sleep 0.5; 
+# set -l andnow (gdate +%s%N);  echo cool (math ( math $andnow - $earlier) / 1000 / 1000  )
 
 
 
diff --git a/docs/upsampling images.sh b/docs/upsampling images.sh
index 238887e89..c383411a7 100644
--- a/docs/upsampling images.sh	
+++ b/docs/upsampling images.sh	
@@ -1,3 +1,5 @@
+# shellcheck disable=2148
+
 # basic
 convert image-filename.png -resize 300% image-filename.3x-basic.png
 
diff --git a/setup-a-new-machine.sh b/setup-a-new-machine.sh
index bbc515f58..bf0a773c1 100755
--- a/setup-a-new-machine.sh
+++ b/setup-a-new-machine.sh
@@ -1,5 +1,6 @@
 # copy paste this file in bit by bit.
 # don't run it.
+# shellcheck disable=2148
   echo "do not run this script in one go. hit ctrl-c NOW"
   read -n 1
 
diff --git a/setup-chromium.sh b/setup-chromium.sh
index a95c5e810..32601c59c 100644
--- a/setup-chromium.sh
+++ b/setup-chromium.sh
@@ -2,6 +2,7 @@
 ## Chromium hacking
 
 # improve perf of git inside of chromium checkout
+# shellcheck disable=2148
 
 # Read https://chromium.googlesource.com/chromium/src/+/HEAD/docs/mac_build_instructions.md#improving-performance-of-git-commands
 # ... and do it all.
diff --git a/symlink-setup.sh b/symlink-setup.sh
index 4c211fb12..1f3fd75ff 100755
--- a/symlink-setup.sh
+++ b/symlink-setup.sh
@@ -159,7 +159,7 @@ main() {
     local sourceFile=""
     local targetFile=""
 
-    for i in ${FILES_TO_SYMLINK[@]}; do
+    for i in "${FILES_TO_SYMLINK[@]}"; do
 
         sourceFile="$(pwd)/$i"
         targetFile="$HOME/$(printf "%s" "$i" | sed "s/.*\/\(.*\)/\1/g")"