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docs: _PR_LIB example

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18
modules.md
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@ -48,8 +48,24 @@ If exposing modules in `PATH` annoys you, you can set the `_PR_LIB` environment
Example in a [FHS 3.0 compliant system](https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s06.html):
```shell
export _PR_LIB_DIR="/usr/lib:$HOME/.local/lib"
export _PR_LIB="/usr/lib:$HOME/.local/lib"
```
This is not the default as there is no general way to know its value and depends on distribution (`/usr/lib`, `/usr/libexec`, `/data/data/com.termux/files/usr/libexec`, etc.). System programs usually have a hard-coded path looking for `lib`. If you are a package maintainer for a distribution, setting this value when compiling, so it fits into your distribution standard.
If you installed the module with `cargo install`, the binary will be placed in `bin` subdirectory under Cargo's home which should be in the `PATH` anyway. Cargo has no option to place in subdirectories with other names.
The following snippet is what I used to package for Arch Linux package, adding a `_PR_LIB` declaration along with initialization. The script is `/usr/bin/pay-respects` and the actual executable is located somewhere else.
```sh
#!/bin/sh
if [ "$#" -gt 1 ]; then
SHELL=$(basename $SHELL)
if [ "$SHELL" = "fish" ]; then
echo "set -x _PR_LIB /usr/lib/pay-respects:$HOME/.local/lib/pay-respects"
elif [ "$SHELL" = "nu" ]; then
echo "env:_PR_LIB=/usr/lib/pay-respects:$HOME/.local/lib/pay-respects"
else
echo "_PR_LIB=/usr/lib/pay-respects:$HOME/.local/lib/pay-respects"
fi
fi
/opt/pay-respects/bin/pay-respects "$@"
```