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This is precisely why I have not written any code here to support a "voting system" for questions and answers.

In computing, questions and answers are not so simple to be "the best" or "the worst"...

blkid is part of busybox, if you have that you can try busybox blkid.

string="abc@hotmail.com;xyz@gmail.com;uvw@yahoo.com"
str1=${string%%;*}
str3=${string##*;}
temp=${string#$str1;}
str2=${temp#;$str3}

Yes.

/usr/local/lib is a conventional place to add local libraries, but it is not a default location for any FreeBSD supplied libraries. And, it is not a directory that is searched by default by...

cpp -dM /dev/null

cpp -dM <<"EOF"
#include <sys/param.h>

/* as much more code as you want */
EOF