On my Linux Mint 19.1:
```bash
$ umask
0022
```

After the first run of `bitcoin-qt -sysperm=false` the `0700` permissions are expected for both the datadir (`~/.bitcoin`) and the walletdir (`~/.bitcoin/wallets`).

Actually, the directories are created with such access permissions:
```bash
$ stat ~/.bitcoin | grep Uid
Access: (0755/drwxr-xr-x)  Uid: ( 1000/ hebasto)   Gid: ( 1000/ hebasto)
$ stat ~/.bitcoin/wallets | grep Uid
Access: (0755/drwxr-xr-x)  Uid: ( 1000/ hebasto)   Gid: ( 1000/ hebasto)
```

Refs:
- #4286
- #13371
- #13389

NOTE: reading through the initial PR #4286 makes me think it was controversial. Is it a better and simpler way to just get rid of `-sysperm` option? I believe a user who needs this option can easily run `chown` command.
{
    LOCK(cs_args);
    m_network = network;
}
bool ArgsManager::ParseParameters(int argc, const char* const argv[], std::string& error)
{
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    m_settings.command_line_options.clear();
    for (int i = 1; i < argc; i++) {
        std::string key(argv[i]);
#ifdef MAC_OSX
        
        
        
        
        if (key.substr(0, 5) == "-psn_") continue;
#endif
        if (key == "-") break; 
        std::optional<std::string> val;
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#ifdef WIN32
        key = ToLower(key);