Linux shell script shebang env All In One

Linux shell script shebang env All In One

指定 shell script 的运行环境

shell script shebang env

hash bang env

#!\usr\bin\env bash ❌

#!\usr\bin\env bash
# ❌

#!/usr/bin/env ✅

#!/usr/bin/env bash
✅

demos

#!/usr/bin/env bash
# ✅

export N=1
# case 1 数字
# suceess exit ✅

# ✅
case "$N" in
  1)
    echo 'case 1 数字';;
  2)
    echo 'case 2 数字';;
  *)
    echo 'default case 数字 *'
    echo 'error exit ❌'
    exit 1
  ;;
esac

echo 'suceess exit ✅'
exit 0

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#!/usr/bin/env bash vs #!/usr/bin/bash vs #!/bin/bash

The Difference Between #!/bin/bash and #!/usr/bin/env bash

The Difference Between #!/usr/bin/bash and #!/usr/bin/env bash

https://www.baeldung.com/linux/bash-shebang-lines

https://unix.stackexchange.com/questions/29608/why-is-it-better-to-use-usr-bin-env-name-instead-of-path-to-name-as-my

https://stackoverflow.com/questions/16365130/what-is-the-difference-between-usr-bin-env-bash-and-usr-bin-bash

refs

https://www.cyberciti.biz/tips/finding-bash-perl-python-portably-using-env.html

https://stackoverflow.com/questions/43793040/how-does-usr-bin-env-work-in-a-linux-shebang-line

https://www.baeldung.com/linux/bash-shebang-lines

https://unix.stackexchange.com/questions/29608/why-is-it-better-to-use-usr-bin-env-name-instead-of-path-to-name-as-my

https://stackoverflow.com/questions/16365130/what-is-the-difference-between-usr-bin-env-bash-and-usr-bin-bash

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