Not all distros have bash in /bin/bash. In fact, most distros are moving binaries away from /bin and into /usr/bin (even Debian!). But still, not all distros have bash in /bin or /usr/bin. However, pretty much all of them have env in /usr/bin. /usr/bin/env bash searches $PATH for the bash executable, and is the most portable shebang to use.
I.e., on OpenBSD, you find bash in /usr/bin/local/bash, and there is no /bin/bash, so autopostgresql fails before it even starts.
Not all distros have bash in
/bin/bash. In fact, most distros are moving binaries away from/binand into/usr/bin(even Debian!). But still, not all distros have bash in/binor/usr/bin. However, pretty much all of them haveenvin/usr/bin./usr/bin/env bashsearches$PATHfor the bash executable, and is the most portable shebang to use.I.e., on OpenBSD, you find bash in
/usr/bin/local/bash, and there is no/bin/bash, so autopostgresql fails before it even starts./usr/bin/env bashseems to be best practice :).