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gethost
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gethost
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#!/bin/sh
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
# Copyright 2023 Jeremy Brubaker <јЬruЬаkе@оrіоnаrtѕ.іо>
#
# abstract: extract hostname from an SSH config file by 'Host' entry
#
# Defaults {{{1
CONFIG_DFLT=
# Documentation {{{1
#
VERSION='1.0'
PROGNAME=$(basename $0)
print_help() {
cat <<EOF
Usage: $PROGNAME [OPTION] HOST
Get the ssh(1) 'Hostname' for HOST
-F [CONFIGFILE] configuration file to use instead of the
ssh(1) default
-v display version info and exit
-h display this help and exit
EOF
}
print_version() {
cat <<EOF
$PROGNAME $VERSION
Copyright (C) 2023 Orion Arts
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Jeremy Brubaker.
EOF
}
# Process options {{{1
#
config=$CONFIG_DFLT
while getopts 'F:vh' opt; do
case $opt in
F) config="$OPTARG" ;;
v) print_version; exit ;;
h|?) print_help; exit ;;
esac
done
shift $((OPTIND - 1))
host=$1
if [ -z "$host" ]; then
printf '%s\n' "No HOST provided" >&2
exit 1
fi
# Main {{{1
#
ssh -G "$host" ${config:+-F "$config"} | awk '$1 == "hostname" { print $2 }'