【217】＃!/ The meaning of usr/bin/env

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stay linux Some of bash Script for , You need to specify the interpreter of the script in the first line , Such as ： 

#!/usr/bin/env bash


#!/usr/bin/bash


#!/usr/bin/env python3  
 Tell the operating system to execute this script , call /usr/bin Under the python Interpreter ;


#!/usr/bin/python3　　
 Tell the operating system to env Search in settings python Installation path for , Then call the interpreter program under the corresponding path to complete the operation 

What is the difference between the two forms ？

Script use env The reason for starting , Because the interpreter of the script may be installed in linux Different directories of ,env Can be in the system of PATH Look for . meanwhile ,env It also stipulates some system environmental quantities .  If you directly write the interpreter path in the script , There may be compatibility problems in some systems where no interpreter can be found .

env It's in the system PATH Find the interpreter in the directory . meanwhile ,env It also specifies some system environment variables , See the link below for specific configuration , Can pass env Command view env Included content

Environment variable configuration

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