add script: remove_line (by number)

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>

remove_line

@@ -0,0 +1,47 @@
+#!/bin/sh
+# 
+# 2011      Nico Schottelius (nico-nsbin at schottelius.org)
+# 
+# This file is part of nsbin.
+#
+# nsbin is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# nsbin is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with nsbin. If not, see <http://www.gnu.org/licenses/>.
+#
+#
+# Helpful for ssh / known_hosts problem:
+
+# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+# @    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
+# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+# IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
+# Someone could be eavesdropping on you right now (man-in-the-middle attack)!
+# It is also possible that the RSA host key has just been changed.
+# The fingerprint for the RSA key sent by the remote host is
+# e0:53:cf:55:ea:ae:06:b1:20:27:f4:ce:29:f4:fb:b4.
+# Please contact your system administrator.
+# Add correct host key in /home/users/nico/.ssh/known_hosts to get rid of this message.
+# Offending key in /home/users/nico/.ssh/known_hosts:381
+# 
+# Use remove_line: remove_line ~/.ssh/known_hosts 381
+
+################################################################################
+
+if [ $# -ne 2 ]; then
+   echo "$0: <file> <line>"
+   exit 1
+fi
+
+file="$1"; shift
+line="$1"; shift
+
+ex -c "${line}d|w|q" "${file}"