Is this an example of a simple and clean solution via shell script? I have some stylistic doubts: 1. What "exitcode" is set for: exitcode=1 exit 1 2. I s

Is this an example of a simple and clean solution via shell script? I have some stylistic doubts: 1. What "exitcode" is set for: exitcode=1 exit 1 2. I see a lot of "return $?". Why "$?" is returned if by default the shell returns the return value of the last command? Just ti name a few: lklfuse -o type=ext4 "${loop}" "$mnt" return $? ... veracrypt --text --non-interactive -d "$file" return $? ... mount "$loop" "$mnt" return $? 3. Aren't =, != etc. used to compare strings and -eq, -ne, -gt etc. used to compare numbers? I see lot of numbers compared as strings, e.g.: [ $? = 0 ] [ $? != 0 ] [ $exitcode = 0 ] 4. There are lot of "cat <<EOF" blocks without indentation. I understand that this is made because the shell expects "EOF" on the line start, but there is a special syntax designed on purpose for this use case, simply put a dash between << and the token, e.g. "cat <<-EOF". In this case: tomb_init() { system="`uname -s`" case "$system" in FreeBSD) cat <<-EOF create=posix_create format=posix_format map=posix_map mount=freebsd_mount close=freebsd_close EOF ;; Linux) 5. Aren't backtick deprecated in favor of $()?