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Clarify that {} is not always required, but rather b3bp-recommended #34

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Thanks to galaktos
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Kevin van Zonneveld 2016-06-22 20:41:53 +02:00
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README.md
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@ -140,7 +140,7 @@ $ my_script some more args --blah
### Safety and Portability ### Safety and Portability
1. Use `{}` to enclose your variables in. Otherwise Bash will try to access the `$ENVIRONMENT_app` variable in `/srv/$ENVIRONMENT_app`, whereas you probably intended `/srv/${ENVIRONMENT}_app`. 1. Use `{}` to enclose your variables in. Otherwise Bash will try to access the `$ENVIRONMENT_app` variable in `/srv/$ENVIRONMENT_app`, whereas you probably intended `/srv/${ENVIRONMENT}_app`. Since it's easy to miss cases like this, we recommend making enclosing a habit.
1. Use `set` rather than relying on a shebang like `#!/usr/bin/env bash -e` as that is neutralized when someone runs your script as `bash yourscript.sh` 1. Use `set` rather than relying on a shebang like `#!/usr/bin/env bash -e` as that is neutralized when someone runs your script as `bash yourscript.sh`
1. Use `#!/usr/bin/env bash` as it is more portable than `#!/bin/bash`. 1. Use `#!/usr/bin/env bash` as it is more portable than `#!/bin/bash`.
1. Use `${BASH_SOURCE[0]}` if you refer to current file even if it is sourced by a parent script. Otherwise use `${0}` 1. Use `${BASH_SOURCE[0]}` if you refer to current file even if it is sourced by a parent script. Otherwise use `${0}`