diff --git a/sheets/az b/sheets/az
index bce8d50..ef34bba 100644
--- a/sheets/az
+++ b/sheets/az
@@ -62,11 +62,11 @@ az disk list --output table
 
 # Copy blob
 az storage blob copy start \
-	--source-uri 'https://md-ldh5nknx2rkz.blob.core.windows.net/jzwuuuzzapn0/abcd?sv=2017-04-17&sr=b&si=68041718-6828-4f5e-9e6e-a1b719975062&sig=XXX' \
-	--account-key XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX== \
-	--account-name destaccount \
-	--destination-container vms \
-	--destination-blob DESTINATION-blob.vhd
+    --source-uri 'https://md-ldh5nknx2rkz.blob.core.windows.net/jzwuuuzzapn0/abcd?sv=2017-04-17&sr=b&si=68041718-6828-4f5e-9e6e-a1b719975062&sig=XXX' \
+    --account-key XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX== \
+    --account-name destaccount \
+    --destination-container vms \
+    --destination-blob DESTINATION-blob.vhd
 
 # List virtual networks
 az network vnet list --output table
diff --git a/sheets/bash b/sheets/bash
index a5672a9..7f096f5 100644
--- a/sheets/bash
+++ b/sheets/bash
@@ -6,23 +6,23 @@ done
 # For example:
 for CurDay in Monday Tuesday Wednesday Thursday Friday Saturday Sunday
 do
-	printf "%s\n" "$CurDay"
+    printf "%s\n" "$CurDay"
 done
 
 # To implement a case statement:
 case $1 in
     0)
-		echo "Found a '0'." ;;
+        echo "Found a '0'." ;;
     1)
-		echo "Found a '1'." ;;
+        echo "Found a '1'." ;;
     2)
-		echo "Found a '2'." ;;
+        echo "Found a '2'." ;;
     3*)
-		echo "Something beginning with '3' found." ;;
-	'')
-		echo "Nothing (null) found." ;;
-	*)
-		echo "Anything else found." ;;
+        echo "Something beginning with '3' found." ;;
+    '')
+        echo "Nothing (null) found." ;;
+    *)
+        echo "Anything else found." ;;
 esac
 
 # Turn on built-in Bash debugging output:
@@ -67,8 +67,8 @@ command -v ${program} >/dev/null 2>&1 || error "${program} not installed"
 # However, that is a solution commonly found in a script using the Bourne shell, so
 # in this case, an alternative, Bash-like, and more accurate version could be:
 if ! type -fP bash > /dev/null 2>&1; then
-	printf "ERROR: Dependency 'bash' not met." >&2
-	exit 1
+    printf "ERROR: Dependency 'bash' not met." >&2
+    exit 1
 fi
 
 # Send both STDOUT and STDERR from COMMAND to FILE. The `2>&1` must go at the end.
diff --git a/sheets/fdisk b/sheets/fdisk
index 7cf417d..19c6e94 100644
--- a/sheets/fdisk
+++ b/sheets/fdisk
@@ -47,12 +47,13 @@ UUID=<blkid#> /opt defaults 0 0 # 00 disable disk checking and metadata dumping
 mount -a
 df -h /opt
 
-# Extending a physical disk (vm)
-1.  Unmount drive - comment out /etc/fstab entry for /dev/sdc
-2.  Increase drive physical space
-3.  parted /dev/sdc - 'p' 	#print partitions on /dev/sdc
-4.  fdisk /dev/sdc - 'p' - 'd' - 'n' (defaults) - w	# delete old partition, create new partition
-5.  reboot
-6.  e2fsck -f /dev/sdc1
-7.  resize2fs /dev/sdc1
-8.  mount /dev/sdc1 - uncomment fstab
+# Extending a physical disk (vm). Step 3 prints partitions on `/dev/sdc`. Step
+# 4 deletes the old partition, then creates a new one.
+1. Unmount drive. Comment out `/etc/fstab` entry for `/dev/sdc`.
+2. Increase drive physical space
+3. parted /dev/sdc - 'p'
+4. fdisk /dev/sdc - 'p' - 'd' - 'n' (defaults) - w
+5. reboot
+6. e2fsck -f /dev/sdc1
+7. resize2fs /dev/sdc1
+8. mount /dev/sdc1 - uncomment fstab
diff --git a/sheets/go b/sheets/go
index a054fb3..8357857 100644
--- a/sheets/go
+++ b/sheets/go
@@ -19,5 +19,5 @@ go install
 # See also:
 #   Go language cheat sheets at /go/
 #   list of pages:      /go/:list
-#   learn go:       	/go/:learn
+#   learn go:           /go/:learn
 #   search in pages:    /go/~keyword
diff --git a/sheets/xargs b/sheets/xargs
index f329873..5751f5f 100644
--- a/sheets/xargs
+++ b/sheets/xargs
@@ -15,8 +15,8 @@ find -name \*.pdf -type f -print0 | xargs -0rn10 rm
 find -name \*.pdf | xargs -I{} rm -rf '{}'
 
 # Will show every .pdf like:
-#	&toto.pdf=
-#	&titi.pdf=
+#    &toto.pdf=
+#    &titi.pdf=
 # -n1 => One file by one file. ( -n2 => 2 files by 2 files )
 find -name \*.pdf | xargs -I{} -n1 echo '&{}='
 # The above is, however, much faster and easier without xargs: