diff --git a/wait-for-it.sh b/wait-for-it.sh
index eb722b0..071c2be 100755
--- a/wait-for-it.sh
+++ b/wait-for-it.sh
@@ -1,15 +1,15 @@
 #!/usr/bin/env bash
 #   Use this script to test if a given TCP host/port are available
 
-cmdname=${0##*/}
+WAITFORIT_cmdname=${0##*/}
 
-echoerr() { if [[ $QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }
+echoerr() { if [[ $WAITFORIT_QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }
 
 usage()
 {
     cat << USAGE >&2
 Usage:
-    $cmdname host:port [-s] [-t timeout] [-- command args]
+    $WAITFORIT_cmdname host:port [-s] [-t timeout] [-- command args]
     -h HOST | --host=HOST       Host or IP under test
     -p PORT | --port=PORT       TCP port under test
                                 Alternatively, you specify the host and port as host:port
@@ -24,47 +24,47 @@ USAGE
 
 wait_for()
 {
-    if [[ $TIMEOUT -gt 0 ]]; then
-        echoerr "$cmdname: waiting $TIMEOUT seconds for $HOST:$PORT"
+    if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then
+        echoerr "$WAITFORIT_cmdname: waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT"
     else
-        echoerr "$cmdname: waiting for $HOST:$PORT without a timeout"
+        echoerr "$WAITFORIT_cmdname: waiting for $WAITFORIT_HOST:$WAITFORIT_PORT without a timeout"
     fi
-    start_ts=$(date +%s)
+    WAITFORIT_start_ts=$(date +%s)
     while :
     do
-        if [[ $ISBUSY -eq 1 ]]; then
-            nc -z $HOST $PORT
-            result=$?
+        if [[ $WAITFORIT_ISBUSY -eq 1 ]]; then
+            nc -z $WAITFORIT_HOST $WAITFORIT_PORT
+            WAITFORIT_result=$?
         else
-            (echo > /dev/tcp/$HOST/$PORT) >/dev/null 2>&1
-            result=$?
+            (echo > /dev/tcp/$WAITFORIT_HOST/$WAITFORIT_PORT) >/dev/null 2>&1
+            WAITFORIT_result=$?
         fi
-        if [[ $result -eq 0 ]]; then
-            end_ts=$(date +%s)
-            echoerr "$cmdname: $HOST:$PORT is available after $((end_ts - start_ts)) seconds"
+        if [[ $WAITFORIT_result -eq 0 ]]; then
+            WAITFORIT_end_ts=$(date +%s)
+            echoerr "$WAITFORIT_cmdname: $WAITFORIT_HOST:$WAITFORIT_PORT is available after $((WAITFORIT_end_ts - WAITFORIT_start_ts)) seconds"
             break
         fi
         sleep 1
     done
-    return $result
+    return $WAITFORIT_result
 }
 
 wait_for_wrapper()
 {
     # In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692
-    if [[ $QUIET -eq 1 ]]; then
-        timeout $BUSYTIMEFLAG $TIMEOUT $0 --quiet --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
+    if [[ $WAITFORIT_QUIET -eq 1 ]]; then
+        timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --quiet --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT &
     else
-        timeout $BUSYTIMEFLAG $TIMEOUT $0 --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
+        timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT &
     fi
-    PID=$!
-    trap "kill -INT -$PID" INT
-    wait $PID
-    RESULT=$?
-    if [[ $RESULT -ne 0 ]]; then
-        echoerr "$cmdname: timeout occurred after waiting $TIMEOUT seconds for $HOST:$PORT"
+    WAITFORIT_PID=$!
+    trap "kill -INT -$WAITFORIT_PID" INT
+    wait $WAITFORIT_PID
+    WAITFORIT_RESULT=$?
+    if [[ $WAITFORIT_RESULT -ne 0 ]]; then
+        echoerr "$WAITFORIT_cmdname: timeout occurred after waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT"
     fi
-    return $RESULT
+    return $WAITFORIT_RESULT
 }
 
 # process arguments
@@ -72,53 +72,53 @@ while [[ $# -gt 0 ]]
 do
     case "$1" in
         *:* )
-        hostport=(${1//:/ })
-        HOST=${hostport[0]}
-        PORT=${hostport[1]}
+        WAITFORIT_hostport=(${1//:/ })
+        WAITFORIT_HOST=${WAITFORIT_hostport[0]}
+        WAITFORIT_PORT=${WAITFORIT_hostport[1]}
         shift 1
         ;;
         --child)
-        CHILD=1
+        WAITFORIT_CHILD=1
         shift 1
         ;;
         -q | --quiet)
-        QUIET=1
+        WAITFORIT_QUIET=1
         shift 1
         ;;
         -s | --strict)
-        STRICT=1
+        WAITFORIT_STRICT=1
         shift 1
         ;;
         -h)
-        HOST="$2"
-        if [[ $HOST == "" ]]; then break; fi
+        WAITFORIT_HOST="$2"
+        if [[ $WAITFORIT_HOST == "" ]]; then break; fi
         shift 2
         ;;
         --host=*)
-        HOST="${1#*=}"
+        WAITFORIT_HOST="${1#*=}"
         shift 1
         ;;
         -p)
-        PORT="$2"
-        if [[ $PORT == "" ]]; then break; fi
+        WAITFORIT_PORT="$2"
+        if [[ $WAITFORIT_PORT == "" ]]; then break; fi
         shift 2
         ;;
         --port=*)
-        PORT="${1#*=}"
+        WAITFORIT_PORT="${1#*=}"
         shift 1
         ;;
         -t)
-        TIMEOUT="$2"
-        if [[ $TIMEOUT == "" ]]; then break; fi
+        WAITFORIT_TIMEOUT="$2"
+        if [[ $WAITFORIT_TIMEOUT == "" ]]; then break; fi
         shift 2
         ;;
         --timeout=*)
-        TIMEOUT="${1#*=}"
+        WAITFORIT_TIMEOUT="${1#*=}"
         shift 1
         ;;
         --)
         shift
-        CLI=("$@")
+        WAITFORIT_CLI=("$@")
         break
         ;;
         --help)
@@ -131,47 +131,48 @@ do
     esac
 done
 
-if [[ "$HOST" == "" || "$PORT" == "" ]]; then
+if [[ "$WAITFORIT_HOST" == "" || "$WAITFORIT_PORT" == "" ]]; then
     echoerr "Error: you need to provide a host and port to test."
     usage
 fi
 
-TIMEOUT=${TIMEOUT:-15}
-STRICT=${STRICT:-0}
-CHILD=${CHILD:-0}
-QUIET=${QUIET:-0}
+WAITFORIT_TIMEOUT=${WAITFORIT_TIMEOUT:-15}
+WAITFORIT_STRICT=${WAITFORIT_STRICT:-0}
+WAITFORIT_CHILD=${WAITFORIT_CHILD:-0}
+WAITFORIT_QUIET=${WAITFORIT_QUIET:-0}
 
 # check to see if timeout is from busybox?
-TIMEOUT_PATH=$(type -p timeout)
-TIMEOUT_PATH=$(realpath $TIMEOUT_PATH 2>/dev/null || readlink -f $TIMEOUT_PATH)
-if [[ $TIMEOUT_PATH =~ "busybox" ]]; then
-        ISBUSY=1
-        BUSYTIMEFLAG="-t"
+WAITFORIT_TIMEOUT_PATH=$(type -p timeout)
+WAITFORIT_TIMEOUT_PATH=$(realpath $WAITFORIT_TIMEOUT_PATH 2>/dev/null || readlink -f $WAITFORIT_TIMEOUT_PATH)
+if [[ $WAITFORIT_TIMEOUT_PATH =~ "busybox" ]]; then
+        WAITFORIT_ISBUSY=1
+        WAITFORIT_BUSYTIMEFLAG="-t"
+
 else
-        ISBUSY=0
-        BUSYTIMEFLAG=""
+        WAITFORIT_ISBUSY=0
+        WAITFORIT_BUSYTIMEFLAG=""
 fi
 
-if [[ $CHILD -gt 0 ]]; then
+if [[ $WAITFORIT_CHILD -gt 0 ]]; then
     wait_for
-    RESULT=$?
-    exit $RESULT
+    WAITFORIT_RESULT=$?
+    exit $WAITFORIT_RESULT
 else
-    if [[ $TIMEOUT -gt 0 ]]; then
+    if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then
         wait_for_wrapper
-        RESULT=$?
+        WAITFORIT_RESULT=$?
     else
         wait_for
-        RESULT=$?
+        WAITFORIT_RESULT=$?
     fi
 fi
 
-if [[ $CLI != "" ]]; then
-    if [[ $RESULT -ne 0 && $STRICT -eq 1 ]]; then
-        echoerr "$cmdname: strict mode, refusing to execute subprocess"
-        exit $RESULT
+if [[ $WAITFORIT_CLI != "" ]]; then
+    if [[ $WAITFORIT_RESULT -ne 0 && $WAITFORIT_STRICT -eq 1 ]]; then
+        echoerr "$WAITFORIT_cmdname: strict mode, refusing to execute subprocess"
+        exit $WAITFORIT_RESULT
     fi
-    exec "${CLI[@]}"
+    exec "${WAITFORIT_CLI[@]}"
 else
-    exit $RESULT
+    exit $WAITFORIT_RESULT
 fi