diff --git a/bin/bmodel b/bin/bmodel
index 99cee3c6..d97983b2 100755
--- a/bin/bmodel
+++ b/bin/bmodel
@@ -21,7 +21,7 @@ SCRIPT_DIR=$(cd $(dirname ${SCRIPT}) && pwd)
 . ${SCRIPT_DIR}/bubble_common
 
 UPDATE_OPT=""
-if [[ ! -z "${1}" && ( "${1}" == "-u" || "${1}" == "--update-all" ) ]] ; then
+if [[ -n "${1}" && ( "${1}" == "-u" || "${1}" == "--update-all" ) ]] ; then
   UPDATE_OPT="--update-all"
   shift
 fi
diff --git a/bin/bpatch b/bin/bpatch
index a01a537d..b0ee85fd 100755
--- a/bin/bpatch
+++ b/bin/bpatch
@@ -54,7 +54,7 @@ else
   scp -P ${BUBBLE_SSH_PORT} "$(find "./target" -type f -name "bubble*.jar" | grep -v full | head -1)" ${HOST}:/tmp/bubble.jar || die "Error copying file to remote host ${HOST}"
 fi
 
-if [[ ! -z "${NO_RESTART}" && "${NO_RESTART}" == "norestart" ]] ; then
+if [[ -n "${NO_RESTART}" && "${NO_RESTART}" == "norestart" ]] ; then
   echo "Patching but not restarting: ${HOST} ..."
   ssh -p ${BUBBLE_SSH_PORT} ${HOST} "cat /tmp/bubble.jar > ~bubble/api/bubble.jar"
 else
diff --git a/bin/bpyvenv.sh b/bin/bpyvenv.sh
index 591ad631..d91ccf30 100755
--- a/bin/bpyvenv.sh
+++ b/bin/bpyvenv.sh
@@ -19,7 +19,7 @@ fi
 . ${BUBBLE_HOME}/.venv/bin/activate || die "Error activating bubble venv"
 python3 -m pip install requests || die "Error installing pip packages"
 
-if [[ ! -z "${1}" ]] ; then
+if [[ -n "${1}" ]] ; then
   script=${1}
   shift
   echo python3 "${script}" "${@}"
diff --git a/bin/bscript b/bin/bscript
index cce96a64..20857037 100755
--- a/bin/bscript
+++ b/bin/bscript
@@ -40,7 +40,7 @@ if [[ -z "${BUBBLE_INCLUDE}" ]] ; then
     fi
   done
 fi
-if [[ ! -z "${BUBBLE_INCLUDE}" ]] ; then
+if [[ -n "${BUBBLE_INCLUDE}" ]] ; then
   BUBBLE_INCLUDE="-I ${BUBBLE_INCLUDE}"
 fi
 
diff --git a/bin/bubble b/bin/bubble
index 8b8ebfe4..34a8c577 100755
--- a/bin/bubble
+++ b/bin/bubble
@@ -54,7 +54,7 @@ fi
 # always send help commands through
 last_arg="$(echo "${@}" | awk '{print $NF}')"
 is_help=0
-if [[ ! -z "${last_arg}" && ( "${last_arg}" == "-h" || "${last_arg}" == "--help" ) ]] ; then
+if [[ -n "${last_arg}" && ( "${last_arg}" == "-h" || "${last_arg}" == "--help" ) ]] ; then
   is_help=1
 fi
 
diff --git a/bin/bubble_common b/bin/bubble_common
index d0c98db0..70a23864 100755
--- a/bin/bubble_common
+++ b/bin/bubble_common
@@ -106,10 +106,10 @@ if [[ -z "${BUBBLE_JAR}" ]] ; then
     BUBBLE_JAR="${BUBBLE_SCRIPTS}/../bubble.jar"
   else
     BUBBLE_JAR="$(find "${BUBBLE_SCRIPTS}/../bubble-server/target" -type f -name "bubble*.jar" | head -1)"
-    if [[ ! -z "${BUBBLE_JAR}" ]] ; then
+    if [[ -n "${BUBBLE_JAR}" ]] ; then
       # Use full jar if available. Client libraries like to have the JS engine for example. This is stripped from the server.
       BUBBLE_FULL_JAR="$(find "${BUBBLE_SCRIPTS}/../bubble-server/target" -type f -name "bubble*-full.jar" | head -1)"
-      if [[ ! -z "${BUBBLE_FULL_JAR}" ]] ; then
+      if [[ -n "${BUBBLE_FULL_JAR}" ]] ; then
         BUBBLE_JAR="${BUBBLE_FULL_JAR}"
       fi
     fi
diff --git a/bin/build_dist b/bin/build_dist
index a2684ad8..e8b30ac6 100755
--- a/bin/build_dist
+++ b/bin/build_dist
@@ -64,7 +64,7 @@ cd "${DIST}/.." && zip -r "${ZIP}" "$(basename ${DIST})"
 echo "Distribution created: "
 ls -lh "${ZIP}"
 
-if [[ ! -z "${BUBBLE_DIST_HOME}" ]] ; then
+if [[ -n "${BUBBLE_DIST_HOME}" ]] ; then
   IS_DEV=0
   if [[ -z ${BUILD_NUMBER} ]] ; then
     BUILD_NUMBER="dev"
diff --git a/bin/cleanup_bubble_databases b/bin/cleanup_bubble_databases
index 84717ee3..5f3acdb9 100755
--- a/bin/cleanup_bubble_databases
+++ b/bin/cleanup_bubble_databases
@@ -37,7 +37,7 @@ if [[ ${DATABASE_COUNT} -gt 0 ]] ; then
   echo "Cleaning up ${DATABASE_COUNT} databases..."
 
   DATABASES="$(echo "select datname from pg_database" | psql -qt -U ${DB_USER} template1 | grep ${DB_MATCH} | tr -d ' ')"
-  if [[ ! -z "${DATABASES}" ]] ; then
+  if [[ -n "${DATABASES}" ]] ; then
     for db in ${DATABASES} ; do
       if [[ "${db}" == "bubble" ]] ; then
         echo "Not dropping bubble default database"
diff --git a/bin/git_update_bubble.sh b/bin/git_update_bubble.sh
index 38efd7b7..383f4f68 100755
--- a/bin/git_update_bubble.sh
+++ b/bin/git_update_bubble.sh
@@ -20,7 +20,7 @@ function die {
 }
 
 FAST=${1}
-if [[ ! -z "${FAST}" && "${FAST}" == "fast" ]] ; then
+if [[ -n "${FAST}" && "${FAST}" == "fast" ]] ; then
   FAST=1
 else
   FAST=0
diff --git a/bin/godaddy/gdcurl b/bin/godaddy/gdcurl
index 0be1abff..d91602a6 100755
--- a/bin/godaddy/gdcurl
+++ b/bin/godaddy/gdcurl
@@ -17,7 +17,7 @@ HTTP_METHOD=${3}
 
 API_BASE=https://api.godaddy.com/v1/domains/
 
-if [[ ! -z "${POST_FILE}" ]] ; then
+if [[ -n "${POST_FILE}" ]] ; then
   if [[ -z "${HTTP_METHOD}" ]] ; then
     curl -d @${POST_FILE} -s -H 'Content-Type: application/json' -H "Authorization: sso-key ${GODADDY_API_KEY}:${GODADDY_API_SECRET}" ${API_BASE}${URI}
   else
diff --git a/bin/install_packer.sh b/bin/install_packer.sh
index 0c36860b..0d712a68 100755
--- a/bin/install_packer.sh
+++ b/bin/install_packer.sh
@@ -13,6 +13,15 @@ function die {
 
 PLATFORM="$(uname -s)"
 
+CURL=""
+if [[ -z "$(which curl)" ]] ; then
+  if [[ -f /usr/bin/curl ]] ; then
+    CURL=/usr/bin/curl
+  fi
+else
+  CURL="$(which curl)"
+fi
+
 # Install packer
 if [[ ! -f ${HOME}/packer/packer ]] ; then
   PACKER_VERSION=1.6.5
@@ -24,7 +33,7 @@ if [[ ! -f ${HOME}/packer/packer ]] ; then
     die "Add packer support to script ${0} for platform ${PLATFORM}"
   fi
   PACKER_URL=https://releases.hashicorp.com/packer/${PACKER_VERSION}/${PACKER_FILE}
-  mkdir -p ${HOME}/packer && cd ${HOME}/packer && curl -L ${PACKER_URL} -o ${PACKER_FILE} && unzip ${PACKER_FILE} || die "Error installing packer"
+  mkdir -p ${HOME}/packer && cd ${HOME}/packer && "${CURL}" -L ${PACKER_URL} -o ${PACKER_FILE} && unzip ${PACKER_FILE} || die "Error installing packer"
   echo "Packer successfully installed"
 else
   echo "Packer already installed"
@@ -41,7 +50,7 @@ if [[ ! -f ${HOME}/.packer.d/plugins/packer-builder-vultr ]] ; then
     die "Add packer vultr support to script ${0} for platform ${PLATFORM}"
   fi
   PACKER_VULTR_URL=https://github.com/vultr/packer-builder-vultr/releases/download/v${PACKER_VULTR_VERSION}/${PACKER_VULTR_FILE}
-  mkdir -p ${HOME}/.packer.d/plugins && cd ${HOME}/.packer.d/plugins && curl -L ${PACKER_VULTR_URL} -o ${PACKER_VULTR_FILE} && tar xzf ${PACKER_VULTR_FILE}  || die "Error installing packer vultr plugin"
+  mkdir -p ${HOME}/.packer.d/plugins && cd ${HOME}/.packer.d/plugins && "${CURL}" -L ${PACKER_VULTR_URL} -o ${PACKER_VULTR_FILE} && tar xzf ${PACKER_VULTR_FILE}  || die "Error installing packer vultr plugin"
   echo "Packer Vultr plugin successfully installed"
 else
   echo "Packer vultr plugin already installed"
diff --git a/bin/mailgun/mgcurl b/bin/mailgun/mgcurl
index 1a8bfeae..01e1c649 100755
--- a/bin/mailgun/mgcurl
+++ b/bin/mailgun/mgcurl
@@ -17,7 +17,7 @@ function auth () {
   echo -n "Authorization: Basic $(echo -n "api:${BUBBLE_MAILGUN_API_KEY}" | base64)"
 }
 
-if [[ ! -z "${POST_FILE}" ]] ; then
+if [[ -n "${POST_FILE}" ]] ; then
   if [[ -z "${HTTP_METHOD}" ]] ; then
     curl -d @${POST_FILE} -s -H 'Content-Type: multipart/form-data' -H "$(auth)" ${API_BASE}${URI}
   else
diff --git a/bin/prep_bubble_jar b/bin/prep_bubble_jar
index b4ba96ff..0a24e988 100755
--- a/bin/prep_bubble_jar
+++ b/bin/prep_bubble_jar
@@ -23,7 +23,7 @@ SCRIPT="${0}"
 SCRIPT_DIR="$(cd "$(dirname "${SCRIPT}")" && pwd)"
 . "${SCRIPT_DIR}/bubble_common"
 
-if [[ ! -z "${DEBUG_BUILD}" && "${DEBUG_BUILD}" == "debug" ]] ; then
+if [[ -n "${DEBUG_BUILD}" && "${DEBUG_BUILD}" == "debug" ]] ; then
   echo "DEBUG_BUILD is set, not doing anything further"
   exit 0
 fi
@@ -42,10 +42,10 @@ done
 
 cd "${CLASSES_DIR}" && zip -u -r "${BUBBLE_JAR}" scripts || die "Error updating ${BUBBLE_JAR} with scripts"
 
-if [[ ! -z "${BUBBLE_PRODUCTION}" || ( ! -z "${INSTALL_WEB}" && "${INSTALL_WEB}" == "web" ) ]] ; then
+if [[ -n "${BUBBLE_PRODUCTION}" || ( -n "${INSTALL_WEB}" && "${INSTALL_WEB}" == "web" ) ]] ; then
   mkdir -p "${CLASSES_DIR}/site"
   BUBBLE_WEB="$(cd "${SCRIPT_DIR}/../bubble-web" && pwd)"
-  if [[ ! -z "${BUBBLE_PRODUCTION}" ]] ; then
+  if [[ -n "${BUBBLE_PRODUCTION}" ]] ; then
     WEBPACK_OPTIONS="--mode=production"
   else
     WEBPACK_OPTIONS=""
diff --git a/bin/reset_bubble_db b/bin/reset_bubble_db
index 8d0a01c2..be811911 100755
--- a/bin/reset_bubble_db
+++ b/bin/reset_bubble_db
@@ -13,7 +13,7 @@ SCRIPT_DIR="$(cd "$(dirname "${SCRIPT}")" && pwd)"
 . "${SCRIPT_DIR}/bubble_common"
 
 DEBUG=${1}
-if [[ ! -z "${DEBUG}" && "${DEBUG}" == "debug" ]] ; then
+if [[ -n "${DEBUG}" && "${DEBUG}" == "debug" ]] ; then
   DEBUG=1
 else
   DEBUG=0
diff --git a/bin/run.sh b/bin/run.sh
index a5c52923..93096579 100755
--- a/bin/run.sh
+++ b/bin/run.sh
@@ -46,7 +46,7 @@ fi
 
 # save explicitly set key, if we have one
 SAVED_DB_KEY=""
-if [[ ! -z "${BUBBLE_DB_ENCRYPTION_KEY}" ]] ; then
+if [[ -n "${BUBBLE_DB_ENCRYPTION_KEY}" ]] ; then
   SAVED_DB_KEY="${BUBBLE_DB_ENCRYPTION_KEY}"
 fi
 
@@ -63,7 +63,7 @@ if [[ -f ${BUBBLE_ENV} ]] ; then
   . ${BUBBLE_ENV}
 fi
 
-if [[ ! -z "${SAVED_DB_KEY}" ]] ; then
+if [[ -n "${SAVED_DB_KEY}" ]] ; then
   export BUBBLE_DB_ENCRYPTION_KEY="${SAVED_DB_KEY}"
 fi
 
@@ -72,7 +72,7 @@ if [[ "x${debug}" == "xdebug" ]] ; then
   shift
   ARG_LEN=$(echo -n "${1}" | wc -c)
   ARG_NUMERIC_LEN=$(echo -n "${1}" | tr -dc [:digit:] | wc -c)  # strip all non-digits
-  if [[ ! -z "${ARG_NUMERIC_LEN}" && ${ARG_LEN} -eq ${ARG_NUMERIC_LEN} ]] ; then
+  if [[ -n "${ARG_NUMERIC_LEN}" && ${ARG_LEN} -eq ${ARG_NUMERIC_LEN} ]] ; then
     # Second arg is the debug port
     DEBUG_PORT="${1}"
     shift || :
@@ -126,7 +126,7 @@ fi
 
 # Default user if none set
 if [[ -z "${BUBBLE_USER}" ]] ; then
-  if [[ ! -z "${REQUIRE_BUBBLE_USER}" ]] ; then
+  if [[ -n "${REQUIRE_BUBBLE_USER}" ]] ; then
     die "No BUBBLE_USER env var defined"
   fi
   BUBBLE_USER=root@local.local
@@ -137,13 +137,13 @@ if [[ -z "${BUBBLE_PASS}" ]] ; then
 
   # If BUBBLE_API is defined, we may have cached credentials
   BUBBLE_AUTH="${HOME}/.bubble_auth"
-  if [[ ! -z "${BUBBLE_API}" && -d "${BUBBLE_AUTH}" ]] ; then
+  if [[ -n "${BUBBLE_API}" && -d "${BUBBLE_AUTH}" ]] ; then
     if [[ -z "${BUBBLE_DISABLE_AUTH_CACHE}" || "${BUBBLE_DISABLE_AUTH_CACHE}" == "false" ]] ; then
       API_HOST="$(echo -n "${BUBBLE_API}" | awk -F '/' '{print $3}')"
       AUTH_DIR="${BUBBLE_AUTH}/${API_HOST}"
       PASS_FILE="${AUTH_DIR}/${BUBBLE_USER}"
 
-      if [[ ! -z "${BUBBLE_USER}" && -f "${PASS_FILE}" ]] ; then
+      if [[ -n "${BUBBLE_USER}" && -f "${PASS_FILE}" ]] ; then
         if [[ -z "${BUBBLE_QUIET_AUTH_CACHE}" || "${BUBBLE_QUIET_AUTH_CACHE}" != "true" ]] ; then
           echo 1>&2 "Using cached password for user ${BUBBLE_USER} from ${AUTH_DIR}/${BUBBLE_USER}
   - Set env var BUBBLE_DISABLE_AUTH_CACHE=true to disable this behavior
@@ -155,7 +155,7 @@ if [[ -z "${BUBBLE_PASS}" ]] ; then
     fi
   fi
 
-  if [[ ! -z "${REQUIRE_BUBBLE_PASS}" ]] ; then
+  if [[ -n "${REQUIRE_BUBBLE_PASS}" ]] ; then
     die "No BUBBLE_PASS env var defined"
   fi
   echo 1>&2 "*** Warning: BUBBLE_PASS env var was not defined, using default password (probable authentication failure)"
diff --git a/bin/sendgrid/sgcurl b/bin/sendgrid/sgcurl
index 799d5460..af5d81ba 100755
--- a/bin/sendgrid/sgcurl
+++ b/bin/sendgrid/sgcurl
@@ -13,7 +13,7 @@ URI="${1:?no uri}"
 POST_FILE="${2}"
 HTTP_METHOD=${3}
 
-if [[ ! -z "${POST_FILE}" ]] ; then
+if [[ -n "${POST_FILE}" ]] ; then
   if [[ -z "${HTTP_METHOD}" ]] ; then
     curl -d @${POST_FILE} -s -H 'Content-Type: application/json' -H "Authorization: Bearer ${BUBBLE_SMTP_PASS}" ${API_BASE}${URI}
   else
diff --git a/bin/ubuntu_connect_bubble b/bin/ubuntu_connect_bubble
index 251ea17e..ae1dd744 100755
--- a/bin/ubuntu_connect_bubble
+++ b/bin/ubuntu_connect_bubble
@@ -82,7 +82,7 @@ if [[ -z "$(which resolvconf)" ]] ; then
   INSTALL_PACKAGES="${INSTALL_PACKAGES} resolvconf"
 fi
 
-if [[ ! -z "${INSTALL_PACKAGES}" ]] ; then
+if [[ -n "${INSTALL_PACKAGES}" ]] ; then
   echo "
 The following apt packages will be installed:
 
@@ -141,7 +141,7 @@ export BUBBLE_SKIP_PATH_WARNING=true
 bget me | jq .email > /dev/null || die "Error logging into Bubble with API: ${BUBBLE_API}"
 
 # Ensure WireGuard is not running
-if [[ ! -z "$(sudo wg show)" ]] ; then
+if [[ -n "$(sudo wg show)" ]] ; then
   echo "Stopping WireGuard VPN ..."
   sudo wg-quick down wg0
 fi
@@ -334,7 +334,7 @@ VPN Config  : ${WG_CONF}
 Public IP   : $(curl -s http://checkip.amazonaws.com/)
 "
 
-if [[ ! -z "$(which firefox)" ]] ; then
+if [[ -n "$(which firefox)" ]] ; then
   echo "
 ===========================================================
 ===================== Firefox Warning =====================
diff --git a/bin/ubuntu_disconnect_bubble b/bin/ubuntu_disconnect_bubble
index 0e2faa5d..567673db 100755
--- a/bin/ubuntu_disconnect_bubble
+++ b/bin/ubuntu_disconnect_bubble
@@ -31,7 +31,7 @@ function die() {
 
 SCRIPT_DIR="$(cd "$(dirname "${0}")" && pwd)"
 DO_DELETE=0
-if [[ ! -z "${1}" ]] ; then
+if [[ -n "${1}" ]] ; then
   if [[ "${1}" == "delete" ]] ; then
     DO_DELETE=1
   else
@@ -47,7 +47,7 @@ if [[ -z "$(which wg-quick)" ]] ; then
 fi
 
 # Ensure WireGuard is not running
-if [[ ! -z "$(sudo wg show)" ]] ; then
+if [[ -n "$(sudo wg show)" ]] ; then
   echo "Stopping WireGuard VPN ..."
   sudo wg-quick down wg0
 else
@@ -162,7 +162,7 @@ Bubble Host : ${BUBBLE_HOST}
 Public IP   : $(curl -s http://checkip.amazonaws.com/)
 "
 
-if [[ ! -z "$(which firefox)" ]] ; then
+if [[ -n "$(which firefox)" ]] ; then
   echo "
 ===========================================================
 ===================== Firefox Warning =====================