Use more portable way of referring to bash

[tmiw]

Updates build scripts to be able to refer to bash regardless of its location. Resolves #199.

[tmiw]

@drowe67, does this work for you?

[drowe67]

Nice one @tmiw - I just checked and build_linux.sh was busted for me too (Ubuntu 20). Can you pls tell me what /usr/bin/env bash does?

I've tweaked the script a little so it doesn't break when codec2 and LPCNet have already been cloned.

[tmiw]

Nice one @tmiw - I just checked and build_linux.sh was busted for me too (Ubuntu 20). Can you pls tell me what /usr/bin/env bash does?

I've tweaked the script a little so it doesn't break when codec2 and LPCNet have already been cloned.

env uses PATH to search for the location of its first argument and executes the first one it finds. From the env man page for reference:

ENVIRONMENT
     The env utility uses the PATH environment variable to locate the requested utility if the name contains no ‘/’ characters,
     unless the -P option has been specified.

[drowe67]

Thanks @tmiw when I man env I don't see have that line, so thanks for explaining that feature. It is interesting that distros are messing with the location of shells, bash must have been in /bin for decades 🤔

I'm OK for you to merge whenever you like.

[tmiw]

Thanks @tmiw when I man env I don't see have that line, so thanks for explaining that feature. It is interesting that distros are messing with the location of shells, bash must have been in /bin for decades 🤔

I'm OK for you to merge whenever you like.

Sounds good.