First check in - not complete! The ifup script is functional though.

SRC/ifup.8

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+.TH ifup 8 "May 2017" "iftools" "Linux System Administrator's Manual"
+.SH NAME
+ifup \- bring a network interface up
+.br
+ifdown \- take a network interface down
+.br
+ifreload \- reload interface configuration
+.br
+ifquery \- view current state of interfaces
+.SH SYNOPSIS
+.B ifup
+\f |
+.B ifdown
+\f |
+.B ifreload
+\f |
+.B ifquery
+\f <OPTIONS> <INTERFACES>
+.SH DESCRIPTION
+The
+.BR ifup " and " ifdown
+commands may be used to configure (or, respectively, deconfigure) network
+interfaces based on interface definitions in the file
+.IR /etc/network.conf ". The"
+.BR ifreload " command will perform an ifdown and ifup in one command."
+.BR ifquery " may be used to display the running configuration."
+.SH OPTIONS
+A summary of options is included below.
+.TP
+.BR \-a ", " \-\-all
+If given to \fBifup\fP, affect all interfaces marked \fBauto\fP.
+Interfaces are brought up in the order in which they are defined
+in
+.IR /etc/network.conf .
+If given to \fBifdown\fP, affect all defined interfaces.
+Interfaces are brought down in the order in which they are
+listed in the configuration files.
+.TP
+.BR \-h ", " \-\-help
+Show summary of options.
+.TP
+.BR \-n ", " \-\-no\-act
+Don't configure any interfaces or run any "up" or "down" commands.
+.TP
+.BR \-V ", " \-\-version
+Show copyright and version information.
+.TP
+.BR \-v ", " \-\-verbose
+Show commands as they are executed.
+.SH EXAMPLES
+.TP
+.B ifup -a
+Bring up all the interfaces defined with
+.I auto
+in 
+.nh
+.I /etc/network.conf
+.TP
+.B ifup eth0
+Bring up interface
+.B eth0
+.TP
+.B ifdown -a
+Bring down all interfaces that are currently up.
+.TP
+.B ifquery eth0
+Print the running configuration of eth0
+.SH NOTES
+.BR ifup ,
+.BR ifdown ,
+.BR ifreload ,
+and
+.BR ifquery
+are actually the same program called by different names.
+.P
+The program does not configure network interfaces directly;
+it runs low level utilities such as
+.BR ip
+to do its dirty work.
+.P
+When invoked a check will be performed to verify that there
+are no other instances running. If another instance is
+detected the program will exit with an error.
+.SH FILES
+.TP
+.I /etc/network.conf
+definitions of network interfaces
+See
+.BR network.conf (5)
+for more information.
+.TP
+.I /run/network/ifstate
+current state of network interfaces
+.SH AUTHOR
+iftools was written by Jay Larson <jlarson@snaplinux.org>. The functionality is loosely based on the ifupdown suite written by Anthony Towns <aj@azure.humbug.org.au>.
+.SH SEE ALSO
+.BR network.conf (5),
+.BR ip (8)