diff --git a/hack/bootstrap_tfw_dev.sh b/hack/bootstrap_tfw_dev.sh
index 078c09a..3a0d2ed 100755
--- a/hack/bootstrap_tfw_dev.sh
+++ b/hack/bootstrap_tfw_dev.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 set -eo pipefail
+shopt -s expand_aliases
 
 TFW_POSTFIX=tutorial-framework
 BASEIMAGE=baseimage-${TFW_POSTFIX}
@@ -7,7 +8,7 @@ TEST=test-${TFW_POSTFIX}
 FRONTEND=frontend-${TFW_POSTFIX}
 LOGFILE=/tmp/bootstrap_tfw.log
 
-[ "$(uname)" == "Darwin" ] && sed_cmd="gsed" || sed_cmd="sed"
+[ "$(uname)" == "Darwin" ] && alias sed="gsed" || :
 
 showlog() { echo && echo "Error! Showing logs:" && cat $LOGFILE; }
 cleanlog() { rm $LOGFILE; }
@@ -32,7 +33,7 @@ if [ -z "$TFWDEV" ]; then
     TFWURL=https://registry.hub.docker.com/v1/repositories/avatao/tutorial-framework/tags
     PYTHON_PARSEJSON="import sys, json; print json.load(sys.stdin)[-1]['name']"
     LATESTTAG="$(curl -fsSL ${TFWURL} | python -c "${PYTHON_PARSEJSON}")"
-    $sed_cmd -i "1 s/.*/&:${LATESTTAG}/" "${TEST}/solvable/Dockerfile"
+    sed -i "1 s/.*/&:${LATESTTAG}/" "${TEST}/solvable/Dockerfile"
     echo "Done!"
 
     rm -rf "${TEST}/.git"
diff --git a/hack/oneline_install.sh b/hack/oneline_install.sh
index 9679133..337d207 100644
--- a/hack/oneline_install.sh
+++ b/hack/oneline_install.sh
@@ -1 +1 @@
-URL=https://git.io/vxBfj SHA=835ef74695dfcc1003376a19f5e67a9363ab875e4360651aafe7a2597134cc0b bash -c 'cmd="$(curl -fsSL $URL)" && [ $(echo "$cmd" | sha256sum | cut -d " " -f1) == $SHA ] && echo "$cmd" | bash || echo Checksum mismatch!'
+URL=https://git.io/vxBfj SHA=28cddbadc12416fd160590340010189368711612f5ddb9d18ad933ae0199da53 bash -c 'cmd="$(curl -fsSL $URL)" && [ $(echo "$cmd" | sha256sum | cut -d " " -f1) == $SHA ] && echo "$cmd" | bash || echo Checksum mismatch!'
diff --git a/hack/tfw.sh b/hack/tfw.sh
index 604814e..d1dd728 100755
--- a/hack/tfw.sh
+++ b/hack/tfw.sh
@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 set -eo pipefail
+shopt -s expand_aliases
 
-[ "$(uname)" == "Darwin" ] && readlink_cmd="greadlink" || readlink_cmd="readlink"
-SCRIPT_DIR="$(dirname $($readlink_cmd -f $0))"
+[ "$(uname)" == "Darwin" ] && alias readlink="greadlink" || :
+SCRIPT_DIR="$(dirname $(readlink -f $0))"
 
 TAO_PATH="${TAO_PATH:-$SCRIPT_DIR/../..}"
 BASEIMAGE_REPO="${BASEIMAGE_REPO:-baseimage-tutorial-framework}"