有没有在bash中命名“私有函数”的约定？

有没有在bash中命名私有函数的惯例？
我有一个带有一些私有功能的bash模块,想知道我是否应该用下划线启动他们的名字.
到目前为止,我还没有看到任何约定.

对于什么值得,Red Hat的/etc/init.d/functions脚本使用双重下划线.

# __umount_loop awk_program fstab_file first_msg retry_msg umount_args
# awk_program should process fstab_file and return a list of fstab-encoded
# paths; it doesn't have to handle comments in fstab_file.
__umount_loop() {
    # ...
}

# Similar to __umount loop above,specialized for loopback devices
__umount_loopback_loop() {
    # ...
}

# __proc_pids {program} [pidfile]
# Set $pid to pids from /var/run* for {program}.  $pid should be declared
# local in the caller.
# Returns LSB exit code for the 'status' action.
__pids_var_run() {
    # ...
}

# A sed expression to filter out the files that is_ignored_file recognizes
__sed_discard_ignored_files='/\(~\|\.bak\|\.orig\|\.rpmnew\|\.rpmorig\|\.rpmsave\)$/d'