added hint for commands

pipelines/build.sh

 #!/bin/bash
 echo "===================== prepare for installation ====================="
+echo " > whoami"
 whoami
+echo " > uname -a"
 uname -a
+echo " > pwd"
 pwd
+echo " > ls -a"
 ls -a
 
 # define environment variables
@@ -10,9 +14,11 @@ export CSST_SIMS_C3="/nfsdata/share/csst_simulation_data/Cycle-3-SimuData/"
 export CSST_SIMS_C5_2="/nfsdata/share/csst_simulation_data/Cycle-5-SimuData/"
 export AUX_DIR="/nfsdata/users/csstpipeline/L1Pipeline/unittests/"
 
-echo "Python executor and version"
+echo " > which python"
 which python
+echo " > which pip"
 which pip
+echo " > python --version"
 python --version
 
 echo "===================== isntall requirements ====================="