diff --git a/completions/capistrano.completion.sh b/completions/capistrano.completion.sh
index 9d4f7cb5e..40362765b 100644
--- a/completions/capistrano.completion.sh
+++ b/completions/capistrano.completion.sh
@@ -4,11 +4,10 @@
 export COMP_WORDBREAKS=${COMP_WORDBREAKS/\:/}
 
 function _omb_completion_cap {
-  if [ -f Capfile ]; then
-    recent=`ls -t .cap_tasks~ Capfile **/*.cap 2> /dev/null | head -n 1`
+  if [[ -f Capfile ]]; then
+    local recent=$(ls -t .cap_tasks~ Capfile **/*.cap 2> /dev/null | head -n 1)
     if [[ $recent != '.cap_tasks~' ]]; then
-      cap --version | grep 'Capistrano v2.' > /dev/null
-      if [ $? -eq 0 ]; then
+      if cap --version | grep 'Capistrano v2.' > /dev/null; then
         # Capistrano 2.x
         cap --tool --verbose --tasks | cut -d " " -f 2 > .cap_tasks~
       else
@@ -16,7 +15,7 @@ function _omb_completion_cap {
         cap --all --tasks | cut -d " " -f 2 > .cap_tasks~
       fi
     fi
-    COMPREPLY=($(compgen -W "`cat .cap_tasks~`" -- ${COMP_WORDS[COMP_CWORD]}))
+    COMPREPLY=($(compgen -W '$(< .cap_tasks)' -- "${COMP_WORDS[COMP_CWORD]}"))
     return 0
   fi
 }
diff --git a/completions/homesick.completion.sh b/completions/homesick.completion.sh
index 17eeb12ab..577b644c1 100644
--- a/completions/homesick.completion.sh
+++ b/completions/homesick.completion.sh
@@ -3,54 +3,54 @@
 #
 # The homebrew bash completion script was used as inspiration.
 # Originally from https://github.com/liborw/homesick-completion
+# https://github.com/liborw/homesick-completion/blob/904d121d1b8f81629f473915a10c9144fdd416dc/homesick_bash_completion.sh
 
 _omb_completion_homesick()
 {
-  local cur="${COMP_WORDS[COMP_CWORD]}"
+  local cur=${COMP_WORDS[COMP_CWORD]}
   local options="--skip --force --pretend --quiet"
   local actions="cd clone commit destroy diff generate help list open pull push rc show_path status symlink track unlink version"
   local repos=$(\ls ~/.homesick/repos)
 
   # Subcommand list
-  [[ ${COMP_CWORD} -eq 1 ]] && {
-    COMPREPLY=( $(compgen -W "${options} ${actions}" -- ${cur}) )
+  if ((COMP_CWORD == 1)); then
+    COMPREPLY=( $(compgen -W "${options} ${actions}" -- "$cur") )
     return
-  }
+  fi
 
   # Find the first non-switch word
   local prev_index=1
-  local prev="${COMP_WORDS[prev_index]}"
+  local prev=${COMP_WORDS[prev_index]}
   while [[ $prev == -* ]]; do
-    prev_index=$((++prev_index))
-    prev="${COMP_WORDS[prev_index]}"
+    ((++prev_index))
+    prev=${COMP_WORDS[prev_index]}
   done
 
   # Find the number of non-"--" commands
   local num=0
-  for word in ${COMP_WORDS[@]}
-  do
+  for word in "${COMP_WORDS[@]}"; do
     if [[ $word != -* ]]; then
-      num=$((++num))
+      ((++num))
     fi
   done
 
-  case "$prev" in
+  case $prev in
   # Commands that take a castle
   cd|commit|destroy|diff|open|pull|push|rc|show_path|status|symlink|unlink)
-    COMPREPLY=( $(compgen -W "${repos}" -- ${cur}) )
+    COMPREPLY=( $(compgen -W "${repos}" -- "$cur") )
     return
     ;;
   # Commands that take command
   help)
-    COMPREPLY=( $(compgen -W "${actions}" -- ${cur}) )
+    COMPREPLY=( $(compgen -W "${actions}" -- "$cur") )
     return
     ;;
   # Track command take file and repo
   track)
-    if [[ "$num" -eq 2 ]]; then
-      COMPREPLY=( $(compgen -X -f ${cur}) )
-    elif [[ "$num" -ge 3 ]]; then
-      COMPREPLY=( $(compgen -W "${repos}" -- ${cur}) )
+    if ((num == 2)); then
+      COMPREPLY=( $(compgen -X -f "$cur") )
+    elif ((num >= 3)); then
+      COMPREPLY=( $(compgen -W "${repos}" -- "$cur") )
     fi
     return
     ;;
@@ -58,4 +58,3 @@ _omb_completion_homesick()
 }
 
 complete -o bashdefault -o default -F _omb_completion_homesick homesick
-
diff --git a/completions/rake.completion.sh b/completions/rake.completion.sh
index 5bb57f729..f13963137 100644
--- a/completions/rake.completion.sh
+++ b/completions/rake.completion.sh
@@ -4,12 +4,12 @@
 export COMP_WORDBREAKS=${COMP_WORDBREAKS/\:/}
 
 function _omb_completion_rake {
-  if [ -f Rakefile ]; then
-    recent=`ls -t .rake_tasks~ Rakefile **/*.rake 2> /dev/null | head -n 1`
+  if [[ -f Rakefile ]]; then
+    local recent=$(ls -t .rake_tasks~ Rakefile **/*.rake 2> /dev/null | head -n 1)
     if [[ $recent != '.rake_tasks~' ]]; then
       rake --silent --tasks --all | cut -d " " -f 2 > .rake_tasks~
     fi
-    COMPREPLY=($(compgen -W "`cat .rake_tasks~`" -- ${COMP_WORDS[COMP_CWORD]}))
+    COMPREPLY=($(compgen -W '$(< .rake_tasks~)' -- "${COMP_WORDS[COMP_CWORD]}"))
     return 0
   fi
 }
diff --git a/completions/sdkman.completion.sh b/completions/sdkman.completion.sh
index a10d42354..6e25b5043 100644
--- a/completions/sdkman.completion.sh
+++ b/completions/sdkman.completion.sh
@@ -9,13 +9,12 @@ if ! declare -F __sdkman_build_version_csv &>/dev/null; then
   #   sdkman/sdkman-cli".
   #   https://github.com/sdkman/sdkman-cli/blob/19e5c081297d6a8d1ce8a8b54631bb3f8e8e861b/src/main/bash/sdkman-list.sh#L51
   function __sdkman_build_version_csv() {
-    local candidate versions_csv
-    candidate="$1"
-    versions_csv=""
-    if [[ -d "${SDKMAN_CANDIDATES_DIR}/${candidate}" ]]; then
+    local candidate=$1
+    local versions_csv=""
+    if [[ -d ${SDKMAN_CANDIDATES_DIR}/${candidate} ]]; then
       for version in $(find "${SDKMAN_CANDIDATES_DIR}/${candidate}" -maxdepth 1 -mindepth 1 \( -type l -o -type d \) -exec basename '{}' \; | sort -r); do
-        if [[ "$version" != 'current' ]]; then
-          versions_csv="${version},${versions_csv}"
+        if [[ $version != 'current' ]]; then
+          versions_csv=${version},${versions_csv}
         fi
       done
       versions_csv=${versions_csv%?}
@@ -26,36 +25,36 @@ fi
 
 _omb_completion_sdkman()
 {
-  local CANDIDATES
-  local CANDIDATE_VERSIONS
-
+  local cur=${COMP_WORDS[COMP_CWORD]}
   COMPREPLY=()
 
-  if [ $COMP_CWORD -eq 1 ]; then
-    COMPREPLY=( $(compgen -W "install uninstall rm list ls use current outdated version default selfupdate broadcast offline help flush" -- ${COMP_WORDS[COMP_CWORD]}) )
-  elif [ $COMP_CWORD -eq 2 ]; then
-    case "${COMP_WORDS[COMP_CWORD-1]}" in
+  if ((COMP_CWORD == 1)); then
+    COMPREPLY=( $(compgen -W "install uninstall rm list ls use current outdated version default selfupdate broadcast offline help flush" -- "$cur") )
+  elif ((COMP_CWORD == 2)); then
+    case ${COMP_WORDS[COMP_CWORD-1]} in
       "install" | "uninstall" | "rm" | "list" | "ls" | "use" | "current" | "outdated" )
-        CANDIDATES=$(echo "${SDKMAN_CANDIDATES_CSV}" | tr ',' ' ')
-        COMPREPLY=( $(compgen -W "$CANDIDATES" -- ${COMP_WORDS[COMP_CWORD]}) )
+        local candidates
+        candidates=$(echo "${SDKMAN_CANDIDATES_CSV}" | tr ',' ' ')
+        COMPREPLY=( $(compgen -W "$candidates" -- "$cur") )
         ;;
       "offline" )
-        COMPREPLY=( $(compgen -W "enable disable" -- ${COMP_WORDS[COMP_CWORD]}) )
+        COMPREPLY=( $(compgen -W "enable disable" -- "$cur") )
         ;;
       "selfupdate" )
-        COMPREPLY=( $(compgen -W "force" -P "[" -S "]" -- ${COMP_WORDS[COMP_CWORD]}) )
+        COMPREPLY=( $(compgen -W "force" -P "[" -S "]" -- "$cur") )
         ;;
       "flush" )
-        COMPREPLY=( $(compgen -W "candidates broadcast archives temp" -- ${COMP_WORDS[COMP_CWORD]}) )
+        COMPREPLY=( $(compgen -W "candidates broadcast archives temp" -- "$cur") )
         ;;
       *)
         ;;
     esac
-  elif [ $COMP_CWORD -eq 3 ]; then
-    case "${COMP_WORDS[COMP_CWORD-2]}" in
+  elif ((COMP_CWORD == 3)); then
+    case ${COMP_WORDS[COMP_CWORD-2]} in
       "install" | "uninstall" | "rm" | "use" | "default" )
-        _omb_completion_sdkman__candidate_versions ${COMP_WORDS[COMP_CWORD-1]}
-        COMPREPLY=( $(compgen -W "$CANDIDATE_VERSIONS" -- ${COMP_WORDS[COMP_CWORD]}) )
+        local candidate_versions
+        _omb_completion_sdkman__candidate_versions "${COMP_WORDS[COMP_CWORD-1]}"
+        COMPREPLY=( $(compgen -W "$candidate_versions" -- "$cur") )
         ;;
       *)
         ;;
@@ -66,21 +65,19 @@ _omb_completion_sdkman()
 }
 
 function _omb_completion_sdkman__candidate_versions {
-
-  CANDIDATE_LOCAL_VERSIONS=$(_omb_completion_sdkman__cleanup_local_versions $1)
-  if [ "$SDKMAN_OFFLINE_MODE" = "true" ]; then
-    CANDIDATE_VERSIONS=$CANDIDATE_LOCAL_VERSIONS
+  local local_versions=$(_omb_completion_sdkman__cleanup_local_versions "$1")
+  if [[ $SDKMAN_OFFLINE_MODE = "true" ]]; then
+    candidate_versions=$local_versions
   else
-    CANDIDATE_ONLINE_VERSIONS="$(curl -s "${SDKMAN_SERVICE}/candidates/$1" | tr ',' ' ')"
-    CANDIDATE_VERSIONS="$(echo $CANDIDATE_ONLINE_VERSIONS $CANDIDATE_LOCAL_VERSIONS |sort | uniq ) "
+    local online_versions="$(curl -s "${SDKMAN_SERVICE}/candidates/$1" | tr ',' ' ')"
+    candidate_versions="$(echo $online_versions $local_versions |sort | uniq ) "
   fi
 
 }
 
 function _omb_completion_sdkman__cleanup_local_versions {
-  __sdkman_build_version_csv $1
-  echo $CSV | tr ',' ' '
-
+  __sdkman_build_version_csv "$1"
+  tr ',' ' ' <<< "$CSV"
 }
 
 complete -F _omb_completion_sdkman sdk
diff --git a/completions/ssh.completion.sh b/completions/ssh.completion.sh
index 67cb07785..3bcb77562 100644
--- a/completions/ssh.completion.sh
+++ b/completions/ssh.completion.sh
@@ -4,29 +4,28 @@
 export COMP_WORDBREAKS=${COMP_WORDBREAKS/\:/}
 
 function _omb_completion_ssh {
-  local CURRENT_PROMPT="${COMP_WORDS[COMP_CWORD]}"
-  if [[ ${CURRENT_PROMPT} == *@*  ]] ; then
-    local OPTIONS="-P ${CURRENT_PROMPT/@*/}@ -- ${CURRENT_PROMPT/*@/}"
+  local cur=${COMP_WORDS[COMP_CWORD]}
+  if [[ $cur == *@*  ]] ; then
+    local -a options=(-P "${cur%%@*}@" -- "${cur#*@}")
   else
-    local OPTIONS=" -- ${CURRENT_PROMPT}"
+    local -a options=(-- "$cur")
   fi
 
-
   # parse all defined hosts from .ssh/config
-  if [ -r "$HOME/.ssh/config" ]; then
-    COMPREPLY=($(compgen -W "$(grep ^Host "$HOME/.ssh/config" | awk '{for (i=2; i<=NF; i++) print $i}' )" ${OPTIONS}) )
+  if [[ -r $HOME/.ssh/config ]]; then
+    COMPREPLY=($(compgen -W "$(grep ^Host "$HOME/.ssh/config" | awk '{for (i=2; i<=NF; i++) print $i}' )" "${options[@]}"))
   fi
 
   # parse all hosts found in .ssh/known_hosts
-  if [ -r "$HOME/.ssh/known_hosts" ]; then
+  if [[ -r $HOME/.ssh/known_hosts ]]; then
     if grep -v -q -e '^ ssh-rsa' "$HOME/.ssh/known_hosts" ; then
-      COMPREPLY=( ${COMPREPLY[@]} $(compgen -W "$( awk '{print $1}' "$HOME/.ssh/known_hosts" | grep -v ^\| | cut -d, -f 1 | sed -e 's/\[//g' | sed -e 's/\]//g' | cut -d: -f1 | grep -v ssh-rsa)" ${OPTIONS}) )
+      COMPREPLY+=($(compgen -W "$( awk '{print $1}' "$HOME/.ssh/known_hosts" | grep -v ^\| | cut -d, -f 1 | sed -e 's/\[//g' | sed -e 's/\]//g' | cut -d: -f1 | grep -v ssh-rsa)" "${options[@]}"))
     fi
   fi
 
   # parse hosts defined in /etc/hosts
-  if [ -r /etc/hosts ]; then
-    COMPREPLY=( ${COMPREPLY[@]} $(compgen -W "$( grep -v '^[[:space:]]*$' /etc/hosts | grep -v '^#' | awk '{for (i=2; i<=NF; i++) print $i}' )" ${OPTIONS}) )
+  if [[ -r /etc/hosts ]]; then
+    COMPREPLY+=($(compgen -W "$( grep -v '^[[:space:]]*$' /etc/hosts | grep -v '^#' | awk '{for (i=2; i<=NF; i++) print $i}' )" "${options[@]}"))
   fi
 
   return 0