56 lines
672 B
Bash
Executable file
56 lines
672 B
Bash
Executable file
#!/bin/bash
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quiet=false
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while getopts ":q" opt; do
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case $opt in
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q)
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quiet=true
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shift
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;;
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\?)
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echo "Invalid option: -$OPTARG" >&2
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;;
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esac
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done
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host=$1
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port=$2
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nc=$( which nc )
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usage () {
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(
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echo "Usage:"
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echo " $0 host [port]"
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echo " port defaults to 22 (ssh)"
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) >&2
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exit 1
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}
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print_not_reachable () {
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$quiet || echo -n . >&2
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}
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is_port_open () {
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$nc -z -w 2 $host $port >&2
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return $?
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}
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if [ -z "$host" ] ; then
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usage
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fi
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if [ -z "$port" ] ; then
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port=22
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fi
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if [ -z "$nc" ] ; then
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echo "Error, 'nc' not installed."
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exit 2
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fi
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while ! is_port_open ; do
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sleep 1
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print_not_reachable
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done
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echo >&2
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