diff --git a/assignment2/part1/test b/assignment2/part1/test
index 4ed3156..808d7b2 100755
--- a/assignment2/part1/test
+++ b/assignment2/part1/test
@@ -3,7 +3,7 @@
 echo "Building executables..."
 
 cd "${FLAKE:-$(dirname $0)}"
-if command -v nix; then
+if command -v nix &>/dev/null; then
     producer="$(nix build --no-link --print-out-paths .#a2-p1-producer)/bin/producer"
     consumer="$(nix build --no-link --print-out-paths .#a2-p1-consumer)/bin/consumer"
 else
diff --git a/assignment2/part2/test b/assignment2/part2/test
index f036c53..ba3177e 100755
--- a/assignment2/part2/test
+++ b/assignment2/part2/test
@@ -3,7 +3,7 @@
 echo "Building executable..."
 
 cd "${FLAKE:-$(dirname $0)}"
-if command -v nix; then
+if command -v nix &>/dev/null; then
     bidirectional="$(nix build --no-link --print-out-paths .#a2-p2-bidirectional)/bin/bidirectional"
 else
     gcc bidirectional.c -o bidirectional
diff --git a/assignment2/part3/test b/assignment2/part3/test
index 10d0ad0..ae7fb54 100755
--- a/assignment2/part3/test
+++ b/assignment2/part3/test
@@ -3,7 +3,7 @@
 echo "Building executables..."
 
 cd "${FLAKE:-$(dirname $0)}"
-if command -v nix; then
+if command -v nix &>/dev/null; then
     producer="$(nix build --no-link --print-out-paths .#a2-p3-producer)/bin/producer"
     consumer="$(nix build --no-link --print-out-paths .#a2-p3-consumer)/bin/consumer"
 else
diff --git a/assignment3/test b/assignment3/test
index 4439b9e..d97103d 100755
--- a/assignment3/test
+++ b/assignment3/test
@@ -3,7 +3,7 @@
 echo "Building executables..."
 
 cd "${FLAKE:-$(dirname $0)}"
-if command -v nix; then
+if command -v nix &>/dev/null; then
     producer="$(nix build --no-link --print-out-paths .#a3-producer)/bin/producer"
     consumer="$(nix build --no-link --print-out-paths .#a3-consumer)/bin/consumer"
 else
diff --git a/project2/test/random b/project2/test/random
index a09cb7e..80bc61d 100755
--- a/project2/test/random
+++ b/project2/test/random
@@ -3,7 +3,7 @@
 echo "Building executable..."
 
 cd "${FLAKE:-$(dirname $0)}"
-if command -v nix; then
+if command -v nix &>/dev/null; then
     cpu_schedulers="$(nix build --no-link --print-out-paths .#cpu-schedulers)/bin/cpu-schedulers"
 else
     make