shellcheck: Remove unnecessary echo usage

This simplifies some code in response to this message from shellcheck:

    SC2005 (style): Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.

Signed-off-by: Russell Bryant <[email protected]>

.buildkite/nightly-benchmarks/run-nightly-suite.sh

@@ -12,7 +12,7 @@ check_gpus() {
         echo "Need at least 1 GPU to run benchmarking."
         exit 1
     fi
-    gpu_type=$(echo "$(nvidia-smi --query-gpu=name --format=csv,noheader)" | awk '{print $2}')
+    gpu_type=$(nvidia-smi --query-gpu=name --format=csv,noheader | awk '{print $2}')
     echo "GPU type is $gpu_type"
 }
 

.buildkite/nightly-benchmarks/scripts/run-lmdeploy-nightly.sh

@@ -11,7 +11,7 @@ check_gpus() {
     echo "Need at least 1 GPU to run benchmarking."
     exit 1
   fi
-  declare -g gpu_type=$(echo "$(nvidia-smi --query-gpu=name --format=csv,noheader)" | awk '{print $2}')
+  declare -g gpu_type=$(nvidia-smi --query-gpu=name --format=csv,noheader | awk '{print $2}')
   echo "GPU type is $gpu_type"
 }
 

.buildkite/nightly-benchmarks/scripts/run-performance-benchmarks.sh

@@ -17,7 +17,7 @@ check_gpus() {
     echo "Need at least 1 GPU to run benchmarking."
     exit 1
   fi
-  declare -g gpu_type=$(echo "$(nvidia-smi --query-gpu=name --format=csv,noheader)" | awk '{print $2}')
+  declare -g gpu_type=$(nvidia-smi --query-gpu=name --format=csv,noheader | awk '{print $2}')
   echo "GPU type is $gpu_type"
 }
 

.buildkite/nightly-benchmarks/scripts/run-tgi-nightly.sh

@@ -11,7 +11,7 @@ check_gpus() {
     echo "Need at least 1 GPU to run benchmarking."
     exit 1
   fi
-  declare -g gpu_type=$(echo "$(nvidia-smi --query-gpu=name --format=csv,noheader)" | awk '{print $2}')
+  declare -g gpu_type=$(nvidia-smi --query-gpu=name --format=csv,noheader | awk '{print $2}')
   echo "GPU type is $gpu_type"
 }
 

.buildkite/nightly-benchmarks/scripts/run-trt-nightly.sh

@@ -11,7 +11,7 @@ check_gpus() {
     echo "Need at least 1 GPU to run benchmarking."
     exit 1
   fi
-  declare -g gpu_type=$(echo "$(nvidia-smi --query-gpu=name --format=csv,noheader)" | awk '{print $2}')
+  declare -g gpu_type=$(nvidia-smi --query-gpu=name --format=csv,noheader | awk '{print $2}')
   echo "GPU type is $gpu_type"
 }
 

.buildkite/nightly-benchmarks/scripts/run-vllm-nightly.sh

@@ -11,7 +11,7 @@ check_gpus() {
     echo "Need at least 1 GPU to run benchmarking."
     exit 1
   fi
-  declare -g gpu_type=$(echo "$(nvidia-smi --query-gpu=name --format=csv,noheader)" | awk '{print $2}')
+  declare -g gpu_type=$(nvidia-smi --query-gpu=name --format=csv,noheader | awk '{print $2}')
   echo "GPU type is $gpu_type"
 }
 

.buildkite/run-neuron-test.sh

@@ -17,7 +17,7 @@ if [ -f /tmp/neuron-docker-build-timestamp ]; then
         echo "$current_time" > /tmp/neuron-docker-build-timestamp
     fi
 else
-    echo "$(date +%s)" > /tmp/neuron-docker-build-timestamp
+    date "+%s" > /tmp/neuron-docker-build-timestamp
 fi
 
 docker build -t neuron -f Dockerfile.neuron .