diff --git a/.config/polybar/launch.sh b/.config/polybar/launch.sh
index fae12c2..d0a4b35 100755
--- a/.config/polybar/launch.sh
+++ b/.config/polybar/launch.sh
@@ -24,7 +24,7 @@ if ! pgrep -ax polybar >/dev/null 2>&1; then
 	primary="$(xrandr -q | grep primary | cut -d' ' -f1)"
 	for m in $(polybar --list-monitors | cut -d':' -f1); do
 		export TRAY_POS=none
-		[ "$m" != "$primary" ] || export TRAY_POS=right
+		[[ "$m" != "$primary" ]] || export TRAY_POS=right
 		export MONITOR="$m"
 		polybar --reload -c "$BASE_DIR/config" main &
 	done
diff --git a/.config/polybar/scripts/battery.sh b/.config/polybar/scripts/battery.sh
index 697e9a0..fe31803 100755
--- a/.config/polybar/scripts/battery.sh
+++ b/.config/polybar/scripts/battery.sh
@@ -17,13 +17,13 @@ declare -a ramp
 ramp=(          )
 
 # display in red when under $low and no charger is connected
-[ "$bat" -gt "$low" ] || [ "$ac" -eq 1 ] || color="$red"
+[[ "$bat" -gt "$low" || "$ac" -eq 1 ]] || color="$red"
 # display in green when over $full and a charger is connected
-[ "$bat" -lt "$full" ] || [ "$ac" -eq 0 ] || color="$green"
+[[ "$bat" -lt "$full" || "$ac" -eq 0 ]] || color="$green"
 
 let "icon_index = $bat / (${#ramp[@]} - 1)"
-[ $icon_index -lt ${#ramp[@]} ] || icond_index=10
+[[ $icon_index -lt ${#ramp[@]} ]] || icond_index=10
 icon="${ramp[$icon_index]}"
-[ "$ac" -eq 0 ] || charge=""
+[[ "$ac" -eq 0 ]] || charge=""
 
 echo "${color}${icon}${charge} ${bat}%"
diff --git a/.config/polybar/scripts/bluetooth.sh b/.config/polybar/scripts/bluetooth.sh
index 5414c35..b47ee59 100755
--- a/.config/polybar/scripts/bluetooth.sh
+++ b/.config/polybar/scripts/bluetooth.sh
@@ -3,7 +3,7 @@
 
 bluetooth_print() {
     bluetoothctl | while read -r; do
-        if [ "$(systemctl is-active "bluetooth.service")" = "active" ]; then
+        if [[ "$(systemctl is-active "bluetooth.service")" = "active" ]]; then
 
             devices_paired=$(echo paired-devices | bluetoothctl | sed -n '/paired-devices/,$p' | grep Device | cut -d ' ' -f 2)
             counter=0
@@ -14,7 +14,7 @@ bluetooth_print() {
                 if echo "$device_info" | grep -q "Connected: yes"; then
                     device_alias=$(echo "$device_info" | grep "Alias" | cut -d ' ' -f 2-)
 
-                    if [ $counter -gt 0 ]; then
+                    if [[ $counter -gt 0 ]]; then
                         printf ", %s" "$device_alias"
                     else
                         printf ": %s" "$device_alias"
diff --git a/.config/rofi/powermenu.sh b/.config/rofi/powermenu.sh
index 3513f41..f635b63 100755
--- a/.config/rofi/powermenu.sh
+++ b/.config/rofi/powermenu.sh
@@ -27,7 +27,7 @@ function scheduled_suspend {
 
     # make sure the input was a valid number
     # side effect: 0 minutes is not possible
-    [ "$min" -ne 0 ] || exit 1
+    [[ "$min" -ne 0 ]] || exit 1
 
     notify-send "suspend in" "$min minutes"
     sleep $((min*60)) && systemctl suspend
@@ -37,15 +37,15 @@ function scheduled_suspend {
 # Note: bash does not keep the order of the keys thus they get sorted
 chosen="$(printf '%s\n' "${!entries[@]}" | sort | rofi "${rofi_args[@]}" "power: ")"
 # exit if nothing was selected
-[ -n "$chosen" ] || exit 1
+[[ -n "$chosen" ]] || exit 1
 # handle scheduled suspend different
-[ "$chosen" != "suspend (scheduled)" ] || { ${entries[$chosen]}; exit $?; }
+[[ "$chosen" != "suspend (scheduled)" ]] || { ${entries[$chosen]}; exit $?; }
 
 # Confirm choice
 yesNo="$(echo -e "yes\nno" | rofi  "${rofi_args[@]}" "Are you sure you want to ${chosen}? ")"
 
 # Exit if "No"
-[ "$yesNo" == "yes" ] || exit 1
+[[ "$yesNo" == "yes" ]] || exit 1
 
 # Execute
 ${entries[$chosen]}
diff --git a/.config/zsh/.zshrc b/.config/zsh/.zshrc
index 326dd53..01bdba1 100644
--- a/.config/zsh/.zshrc
+++ b/.config/zsh/.zshrc
@@ -2,7 +2,7 @@
 ## Created: 2018-11-23
 
 # Set terminals title if this is a scratchpad-terminal
-[ -z "$SCRATCHPAD_TERMINAL" ] || printf "\x1b\x5d\x30\x3bscratchpad-terminal\x07"
+[[ -z "$SCRATCHPAD_TERMINAL" ]] || printf "\x1b\x5d\x30\x3bscratchpad-terminal\x07"
 
 # Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.config/zsh/.zshrc.
 # Initialization code that may require console input (password prompts, [y/n]
@@ -16,7 +16,7 @@ ZSH_CONF="$ZDOTDIR/plugins"
 # https://github.com/romkatv/dotfiles-public/blob/7e49fc4fb71d/.zshrc#L35
 comp-conf() {
 	emulate -L zsh
-	[ ! "$1.zwc" -nt "$1" ] && [ -w "${1:h}" ] || return 0
+	[[ ! "$1.zwc" -nt "$1" && -w "${1:h}" ]] || return 0
 	zmodload -F zsh/files b:zf_mv b:zf_rm
 	local tmp="$1.tmp.$$.zwc"
 	{
@@ -29,7 +29,7 @@ comp-conf() {
 # https://github.com/romkatv/dotfiles-public/blob/7e49fc4fb71d/.zshrc#L47
 comp-source() {
 	emulate -L zsh
-	[ -e "$1" ] && comp-conf "$1" && source -- "$1"
+	[[ -e "$1" ]] && comp-conf "$1" && source -- "$1"
 }
 
 ## set zshoptions
@@ -70,21 +70,21 @@ autoload -U select-word-style && select-word-style bash
 ## Setup the prompt
 # use bright version of colors when printing bold
 if command -v dircolors >/dev/null 2>&1; then
-	if [ -e "${XDG_CONFIG_HOME:-$HOME/.config}/dircolors/dircolors" ]; then
+	if [[ -e "${XDG_CONFIG_HOME:-$HOME/.config}/dircolors/dircolors" ]]; then
 		eval "$(dircolors -b "${XDG_CONFIG_HOME:-$HOME/.config}/dircolors/dircolors")"
 	else
 		eval "$(dircolors -b)"
 	fi
 fi
 
-if [ -e "$ZSH_CONF/powerlevel10k/powerlevel10k.zsh-theme" ]; then
+if [[ -e "$ZSH_CONF/powerlevel10k/powerlevel10k.zsh-theme" ]]; then
 	comp-source "$ZSH_CONF/powerlevel10k/powerlevel10k.zsh-theme"
 	# To customize prompt, run `p10k configure` or edit $ZSH_CONF/p10k.zsh-theme.
 	comp-source "$ZSH_CONF/p10k.zsh-theme"
 fi
 
 ## Setup zsh completion system
-[ ! -d "$ZSH_CONF/completion" ] || fpath=("$ZSH_CONF/completion" $fpath)
+[[ ! -d "$ZSH_CONF/completion" ]] || fpath=("$ZSH_CONF/completion" $fpath)
 
 autoload -Uz compinit
 compinit -d "${XDG_CACHE_HOME:-$HOME/.cache}/zsh/zcompdump-$ZSH_VERSION"
@@ -123,13 +123,13 @@ comp-source "$ZSH_CONF/fzf-tab/fzf-tab.plugin.zsh"
 autoload edit-command-line; zle -N edit-command-line
 ! alias run-help >/dev/null 2>&1 || unalias run-help
 autoload run-help run-help-git zmv
-if [ -d "$ZDOTDIR/autoload" ]; then
+if [[ -d "$ZDOTDIR/autoload" ]]; then
 	fpath=("$ZDOTDIR/autoload" $fpath)
 	autoload -Uz -- "" "${fpath[1]}"/[^_.]*(.xN:t)
 fi
 ! command -v direnv >/dev/null 2>&1 || eval "$(direnv hook zsh)"
 # stderred
-if [ -e "$ZSH_CONF/stderred/build/libstderred.so" ]; then
+if [[ -e "$ZSH_CONF/stderred/build/libstderred.so" ]]; then
 	export LD_PRELOAD="$ZSH_CONF/stderred/build/libstderred.so${LD_PRELOAD:+:$LD_PRELOAD}"
 	export STDERRED_ESC_CODE="$(tput bold && tput setaf 1)"
 	export STDERRED_BLACKLIST="^(git|curl|wget|swipl)$"
@@ -143,7 +143,7 @@ comp-source "$ZSH_CONF/completion.zsh"
 #     async_init
 ### syntax-highlight > keys
 # syntax highlighting
-if [ -e "$ZSH_CONF/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh" ]; then
+if [[ -e "$ZSH_CONF/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh" ]]; then
 	comp-source "$ZSH_CONF/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh"
 	comp-source "$ZSH_CONF/zsh-syntax-highlighting.zsh-theme"
 fi
@@ -164,7 +164,7 @@ elif command -v nano >/dev/null 2>&1; then
 fi
 
 # `sudo nano` won't work without this (?)
-if [ "$TERM" = "xterm-kitty" ]; then
+if [[ "$TERM" = "xterm-kitty" ]]; then
 	export TERM=xterm-256color
 fi
 
@@ -198,5 +198,5 @@ zle_highlight=('paste:none')
 ## History
 HISTSIZE=1000000
 SAVEHIST=1000000
-[ -d "${XDG_DATA_HOME:-$HOME/.local/share}/zsh" ] || mkdir -p "${XDG_DATA_HOME:-$HOME/.local/share}/zsh"
+[[ -d "${XDG_DATA_HOME:-$HOME/.local/share}/zsh" ]] || mkdir -p "${XDG_DATA_HOME:-$HOME/.local/share}/zsh"
 HISTFILE="${XDG_DATA_HOME:-$HOME/.local/share}/zsh/.zsh_history"
diff --git a/.config/zsh/autoload/clang-format b/.config/zsh/autoload/clang-format
index 9a3fdb6..8f013e5 100755
--- a/.config/zsh/autoload/clang-format
+++ b/.config/zsh/autoload/clang-format
@@ -12,7 +12,7 @@ if (( ! idx )); then
 fi
 
 local style="${@[$idx]#-style}" prefix=""
-if [ -n "$style" ]; then
+if [[ -n "$style" ]]; then
 	# Flag was given in form -style=<style>
 	style="${style#=}"
 	prefix="-style="
@@ -21,7 +21,7 @@ else
 	(( idx++ ))
 	style="${@[$idx]}"
 fi
-if [ ! -e "$style" ]; then
+if [[ ! -e "$style" ]]; then
 	# Argument is not a file and thus probably a valid style string that can
 	# be passes to clang-format
 	command clang-format "$@"
diff --git a/.config/zsh/autoload/git-submodule-rm b/.config/zsh/autoload/git-submodule-rm
index d58e7cb..eae1fc5 100755
--- a/.config/zsh/autoload/git-submodule-rm
+++ b/.config/zsh/autoload/git-submodule-rm
@@ -7,7 +7,7 @@
 local toplevel="$(git rev-parse --show-toplevel)" || return
 
 # Exit if no arguements were given
-[ $# -gt 0 ] || return
+[[ $# -gt 0 ]] || return
 
 local separator=""
 for arg in "$@"; do
@@ -16,11 +16,11 @@ for arg in "$@"; do
 	# argument relative from git toplevel
 	local arg_from_git="${${arg:A}##$toplevel/}"
 	# argument has to exist
-	[ -e "$arg" ] || continue
+	[[ -e "$arg" ]] || continue
 	# argument has to exist in repo
-	[ -e "$toplevel/$arg_from_git" ] || continue
+	[[ -e "$toplevel/$arg_from_git" ]] || continue
 	# has to be a submodule
-	[ -e "$toplevel/.git/modules/$arg_from_git" ] || continue
+	[[ -e "$toplevel/.git/modules/$arg_from_git" ]] || continue
 
 	git submodule deinit -f  "$arg"
 	echo "command rm -rf \"$toplevel/.git/modules/$arg_from_git\""
diff --git a/.config/zsh/autoload/glog b/.config/zsh/autoload/glog
index fdf617c..6362cff 100755
--- a/.config/zsh/autoload/glog
+++ b/.config/zsh/autoload/glog
@@ -52,7 +52,7 @@ local -a fzf_args=(
 	# Execute git show on the commit as preview.
 	"--preview" "
 		out=\"\$(echo {} | sed -Ee \"$del_ansi\" -e \"$commit_hash\")\"
-		if [ \"\$out\" ]; then
+		if [[ \"\$out\" ]]; then
 			git show \"${(j:%n:)format}\" \"$date\" $colors \"\$out\" \
 			| diff-so-fancy
 		fi
diff --git a/.config/zsh/autoload/ls b/.config/zsh/autoload/ls
index e7312a9..3698275 100755
--- a/.config/zsh/autoload/ls
+++ b/.config/zsh/autoload/ls
@@ -20,9 +20,9 @@ builtin local -a dirs files
 # All other arguments are kept.
 for arg in "$@"; do
 	shift
-	if [ -d "$arg" ]; then
+	if [[ -d "$arg" ]]; then
 		dirs+="$arg"
-	elif [ -e "$arg" ]; then
+	elif [[ -e "$arg" ]]; then
 		files+="$arg"
 	else
 		set -- "$@" "$arg"
@@ -36,7 +36,7 @@ fi
 
 # Do not separate files and directories if -d flag was specified.
 while getopts d flag 2>/dev/null; do
-	if [ "$flag" = "d" ]; then
+	if [[ "$flag" = "d" ]]; then
 		command ls "$@" -- "${files[@]}" "${dirs[@]}"
 		return
 	fi
diff --git a/.config/zsh/plugins/alias.zsh b/.config/zsh/plugins/alias.zsh
index 8f467ef..74cd4cc 100644
--- a/.config/zsh/plugins/alias.zsh
+++ b/.config/zsh/plugins/alias.zsh
@@ -59,7 +59,7 @@
 		&& sudo apt upgrade -y \
 		&& sudo apt autoremove -y
 
-		[ ! -e /var/run/reboot-required ] \
+		[[ ! -e /var/run/reboot-required ]] \
 		|| printf "\n\nSystem restart required.\n"
 	'
 	alias pdf2t{e,}xt='pdftotext'
diff --git a/.config/zsh/plugins/functions.zsh b/.config/zsh/plugins/functions.zsh
index 20f1a52..db937b6 100644
--- a/.config/zsh/plugins/functions.zsh
+++ b/.config/zsh/plugins/functions.zsh
@@ -25,10 +25,10 @@ function mkcd () {
 	# Create directory
 	mkdir "$@"
 	# shift arguments if mkdir options were used
-	while [ $# -gt 1 ]; do
+	while [[ $# -gt 1 ]]; do
 		shift
 	done
-	if [ -d "$1" ]; then
+	if [[ -d "$1" ]]; then
 		cd "$1"
 		pwd
 	fi
@@ -36,7 +36,7 @@ function mkcd () {
 
 ## Send a message over telegram by using the -e flag
 function msg() {
-	if [ $# -ge 2 ]; then
+	if [[ $# -ge 2 ]]; then
 		telegram-cli -W -e "msg $*" | grep -E "${${*/ /.*}//_/ }"
 		                          # | grep -E "$(echo "$*" | sed 's/ /.*/; s/_/ /g')"
 	else
@@ -47,7 +47,7 @@ function msg() {
 ## Execute tg -e command but cuts of the uninteresting parts
 function tg() {
 	tg="telegram-cli"
-	if [ "$1" = "-e" ]; then
+	if [[ "$1" = "-e" ]]; then
 		shift
 		$tg -N -W -e "$@" | tail -n +9 | head -n -2
 	else
@@ -67,7 +67,7 @@ function qr() {
 ## Edit config file
 function conf() {
 	local CONF_EDITOR
-	if [ -n "$EDITOR" ]; then
+	if [[ -n "$EDITOR" ]]; then
 		CONF_EDITOR="$EDITOR"
 	elif command -v vim &>/dev/null; then
 		CONF_EDITOR=vim
@@ -88,7 +88,7 @@ function conf() {
 	shift $(( $OPTIND - 1 ))
 
 	# conf needs an argument
-	if [ $# -eq 0 ]; then
+	if [[ $# -eq 0 ]]; then
 		printf "\033[1;31mPlease specify a config.\n\033[0m" >&2
 		return 1
 	fi
@@ -100,7 +100,7 @@ function conf() {
 	fi
 
 	# If specific name is given, open file.
-	if [ $# -gt 1 ]; then
+	if [[ $# -gt 1 ]]; then
 		"$CONF_EDITOR" "$CONF_DIR/$2"
 		return
 	fi
@@ -121,10 +121,10 @@ function conf() {
 
 	# check if config file exists
 	for config in $CONF_PATTERNS; do
-		if [ -e "$CONF_DIR/$config" ]; then
+		if [[ -e "$CONF_DIR/$config" ]]; then
 			$CONF_EDITOR "$CONF_DIR/$config"
 			return 0
-		elif [ -e "$CONF_DIR/.$config" ]; then
+		elif [[ -e "$CONF_DIR/.$config" ]]; then
 			$CONF_EDITOR "$CONF_DIR/.$config"
 			return 0
 		fi
@@ -132,10 +132,10 @@ function conf() {
 
 	# if no config was found in a location other than HOME, look again in HOME.
 	# (For cases like default vim with ~/.vim/ and ~/.vimrc)
-	if [ "$CONF_DIR" != "$HOME" ];then
+	if [[ "$CONF_DIR" != "$HOME" ]];then
 		for config in $CONF_PATTERNS; do
 			# Only look for hidden files
-			if [ -e "$HOME/.$config" ]; then
+			if [[ -e "$HOME/.$config" ]]; then
 				$CONF_EDITOR "$HOME/.$config"
 				return 0
 			fi
@@ -149,7 +149,7 @@ function conf() {
 ## Change into config dir
 function c() {
 	CONF_DIR="$(_get_config_dir $*)"
-	if [ $? -eq 0 ]; then
+	if [[ $? -eq 0 ]]; then
 		cd "$CONF_DIR"
 	else
 		printf "$CONF_DIR" >&2
@@ -158,14 +158,14 @@ function c() {
 }
 ## Get config directory
 function _get_config_dir() {
-	if [ $# -gt 1 ]; then
+	if [[ $# -gt 1 ]]; then
 		printf "\033[1;31mPlease specify one config.\n\033[0m" >&2
 		return 1
-	elif [ $# -eq 0 ]; then
+	elif [[ $# -eq 0 ]]; then
 		echo "${XDG_CONFIG_HOME:-$HOME/.config}"
-	elif [ -d "${XDG_CONFIG_HOME:-$HOME/.config}/$1" ]; then
+	elif [[ -d "${XDG_CONFIG_HOME:-$HOME/.config}/$1" ]]; then
 		echo "${XDG_CONFIG_HOME:-$HOME/.config}/$1"
-	elif [ -d "$HOME/.$1" ]; then
+	elif [[ -d "$HOME/.$1" ]]; then
 		echo "$HOME/.$1"
 	else
 		printf "\033[1;31mCould not find config home.\n\033[0m" >&2
@@ -235,20 +235,20 @@ function resolve() {
 			echo "$THIS_COMMAND$THIS_ARGUMENTS"
 		fi
 		THIS_COMMAND="$(which $THIS_COMMAND)"
-		if [ $? -ne 0 ]; then
+		if [[ $? -ne 0 ]]; then
 			echo "${THIS_COMMAND%% *} not found." >&2
 			return 1
 		fi
 		if (( $VERBOSE_MODE )); then
 			echo -n "$THIS_COMMAND"
 			NEXT_STEP="$(file -bh $THIS_COMMAND | cut -d' ' -f4-)"
-			if [ "${NEXT_STEP:0:1}" != '/' ]; then
+			if [[ "${NEXT_STEP:0:1}" != '/' ]]; then
 				NEXT_STEP="${THIS_COMMAND%/*}/$NEXT_STEP"
 			fi
 			while [[ "$(file -bh $THIS_COMMAND)" =~ "^symbolic link to" && "$NEXT_STEP" != "$THIS_COMMAND" ]]; do
 				THIS_COMMAND=$NEXT_STEP
 				NEXT_STEP="$(file -bh $THIS_COMMAND | cut -d' ' -f4-)"
-				if [ "${NEXT_STEP:0:1}" != '/' ]; then
+				if [[ "${NEXT_STEP:0:1}" != '/' ]]; then
 					NEXT_STEP="${THIS_COMMAND%/*}/$NEXT_STEP"
 				fi
 
@@ -268,7 +268,7 @@ function resolve() {
 
 ## Grep a keyword at the beginning of a line (ignoring whitespace) in a man page
 function mangrep() {
-	if [ $# -lt 2 ]; then
+	if [[ $# -lt 2 ]]; then
 		printf "usage:   mangrep <man page> <pattern> [<man flags>]\n" >&2
 		printf "example: mangrep bash \"(declare|typeset)\"\n" >&2
 		return 1
@@ -279,8 +279,8 @@ function mangrep() {
 }
 
 safe-remove() {
-	[ $# -gt 0 ] || return 1
-	[ -e "$1" ] || return 1
+	[[ $# -gt 0 ]] || return 1
+	[[ -e "$1" ]] || return 1
 
 	sync
 	if ! udisksctl unmount -b "$1"; then
diff --git a/.config/zsh/plugins/keys.zsh b/.config/zsh/plugins/keys.zsh
index 4df0623..7213269 100644
--- a/.config/zsh/plugins/keys.zsh
+++ b/.config/zsh/plugins/keys.zsh
@@ -69,7 +69,7 @@ zle -N _expandDots
 bindkey . _expandDots
 
 function ls-on-enter {
-	if [ -z "$BUFFER" ]; then
+	if [[ -z "$BUFFER" ]]; then
 		BUFFER=ls
 		zle accept-line
 	else
@@ -85,7 +85,7 @@ ZSH_AUTOSUGGEST_CLEAR_WIDGETS+=(ls-on-enter)
 # "Scroll" through history if buffer was empty but use it as query for fzf over
 # command line history if not (similar to substring-search but with fzf)
 function fzf-hist-up {
-	if [ -z "$BUFFER" ] || [ "$FZF_HIST_WENT_UP" -eq 1 ]; then
+	if [[ -z "$BUFFER" || "$FZF_HIST_WENT_UP" -eq 1 ]]; then
 		zle up-line-or-history
 		FZF_HIST_WENT_UP=1
 	else
@@ -95,7 +95,7 @@ function fzf-hist-up {
 }
 function fzf-hist-down {
 	zle down-line-or-history
-	[ -n "$BUFFER" ] || FZF_HIST_WENT_UP=
+	[[ -n "$BUFFER" ]] || FZF_HIST_WENT_UP=
 }
 zle -N fzf-hist-up
 zle -N fzf-hist-down
diff --git a/.local/bin/filterHistory b/.local/bin/filterHistory
index 803d608..824997f 100755
--- a/.local/bin/filterHistory
+++ b/.local/bin/filterHistory
@@ -8,9 +8,9 @@
 ##   format of zshs extended history.
 ## An automatic backup is created before deleting that can be used for recovery.
 
-[ $# -eq 1 ] || { echo "Specify history file" >&2; exit 1; }
-[ -e "$1" ] || { echo "File does not exist" >&2; exit 1; }
-[ "$(stat -c '%a' "$1")" = "600" ] || { echo "File does not look like a history file" >&2; exit 1; }
+[[ $# -eq 1 ]] || { echo "Specify history file" >&2; exit 1; }
+[[ -e "$1" ]] || { echo "File does not exist" >&2; exit 1; }
+[[ "$(stat -c '%a' "$1")" = "600" ]] || { echo "File does not look like a history file" >&2; exit 1; }
 
 # Sort the commands per number of occurrences
 most_used="$(\
@@ -42,11 +42,11 @@ else
 	echo
 fi
 
-[ "${#commands}" -gt 0 ] || exit 0
+[[ "${#commands}" -gt 0 ]] || exit 0
 printf '%s\n' "${commands[@]}" | column -x
 echo "Please confirm the deletion of these commands in $1 ('yes')"
 read yn
-[ "$yn" = "yes" ] || exit 1
+[[ "$yn" = "yes" ]] || exit 1
 
 tempd="$(mktemp -d)"
 cp "$1" "$tempd/$(basename "$1")"
diff --git a/meta/submodules b/meta/submodules
index b1e1cf1..ee41f1f 100755
--- a/meta/submodules
+++ b/meta/submodules
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-[ $# -eq 1 ] || { echo "Specify what to do" >&2; exit 1; }
+[[ $# -eq 1 ]] || { echo "Specify what to do" >&2; exit 1; }
 
 case "$1" in
 	"--init") INIT=1;;