lfs-12.2-sysv/scripts/apds25.html


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      D.25. /sbin/ifdown
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      <h4>
        Линукс с нуля - Версия 12.2
      </h4>
      <h3>
        Приложение D. Скрипты загрузки и настройки системы-20240825
      </h3>
      <ul>
        <li class="prev">
          <a accesskey="p" href="apds24.html" title="/sbin/ifup">Пред.</a>
          <p>
            /sbin/ifup
          </p>
        </li>
        <li class="next">
          <a accesskey="n" href="apds26.html" title=
          "/lib/services/ipv4-static">След.</a>
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            /lib/services/ipv4-static
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    </div>
    <h1 class="sect1">
      <a id="ifdown" name="ifdown"></a>D.25. /sbin/ifdown
    </h1>
    <div class="wrap" lang="ru" xml:lang="ru">
      <pre class="screen">#!/bin/bash
########################################################################
# Begin /sbin/ifdown
#
# Description : Interface Down
#
# Authors     : Nathan Coulson - nathan@linuxfromscratch.org
#               Kevin P. Fleming - kpfleming@linuxfromscratch.org
# Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
#
# Version     : LFS 7.0
#
# Notes       : the IFCONFIG variable is passed to the scripts found
#               in the /lib/services directory, to indicate what file the
#               service should source to get interface specifications.
#
########################################################################

RELEASE="7.0"

USAGE="Usage: $0 [ -hV ] [--help] [--version] interface"
VERSTR="LFS ifdown, version ${RELEASE}"

while [ $# -gt 0 ]; do
   case "$1" in
      --help | -h)     help="y"; break ;;

      --version | -V)  echo "${VERSTR}"; exit 0 ;;

      -*)              echo "ifup: ${1}: invalid option" &gt;&amp;2
                       echo "${USAGE}" &gt;&amp; 2
                       exit 2 ;;

      *)               break ;;
   esac
done

if [ -n "$help" ]; then
   echo "${VERSTR}"
   echo "${USAGE}"
   echo
   cat &lt;&lt; HERE_EOF
ifdown is used to bring down a network interface.  The interface
parameter, e.g. eth0 or eth0:2, must match the trailing part of the
interface specifications file, e.g. /etc/sysconfig/ifconfig.eth0:2.

HERE_EOF
   exit 0
fi

file=/etc/sysconfig/ifconfig.${1}

# Skip backup files
[ "${file}" = "${file%""~""}" ] || exit 0

. /lib/lsb/init-functions

if [ ! -r "${file}" ]; then
   log_warning_msg "${file} is missing or cannot be accessed."
   exit 1
fi

. ${file}

if [ "$IFACE" = "" ]; then
   log_failure_msg "${file} does not define an interface [IFACE]."
   exit 1
fi

# We only need to first service to bring down the interface
S=`echo ${SERVICE} | cut -f1 -d" "`

if ip link show ${IFACE} &gt; /dev/null 2&gt;&amp;1; then
   if [ -n "${S}" -a -x "/lib/services/${S}" ]; then
     IFCONFIG=${file} /lib/services/${S} ${IFACE} down
   else
     MSG="Unable to process ${file}.  Either "
     MSG="${MSG}the SERVICE variable was not set "
     MSG="${MSG}or the specified service cannot be executed."
     log_failure_msg "$MSG"
     exit 1
  fi
else
   log_warning_msg "Interface ${1} doesn't exist."
fi

# Leave the interface up if there are additional interfaces in the device
link_status=`ip link show ${IFACE} 2&gt;/dev/null`

if [ -n "${link_status}" ]; then
   if [ "$(echo "${link_status}" | grep UP)" != "" ]; then
      if [ "$(ip addr show ${IFACE} | grep 'inet ')" == ""  ]; then
         log_info_msg "Bringing down the ${IFACE} interface..."
         ip link set ${IFACE} down
         evaluate_retval
      fi
   fi
fi

# End /sbin/ifdown
</pre>
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      <ul>
        <li class="prev">
          <a accesskey="p" href="apds24.html" title="/sbin/ifup">Пред.</a>
          <p>
            /sbin/ifup
          </p>
        </li>
        <li class="next">
          <a accesskey="n" href="apds26.html" title=
          "/lib/services/ipv4-static">След.</a>
          <p>
            /lib/services/ipv4-static
          </p>
        </li>
        <li class="up">
          <a accesskey="u" href="scripts.html" title=
          "Приложение D. Скрипты загрузки и настройки системы-20240825">Наверх</a>
        </li>
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          <a accesskey="h" href="../index.html" title=
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