From ab218353e3d1533a81cc987860c47956ece5c86f Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Thu, 26 Aug 2021 21:10:04 -0400
Subject: ssh-check

---
 ssh-check | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100755 ssh-check

diff --git a/ssh-check b/ssh-check
new file mode 100755
index 0000000..b6bfbd3
--- /dev/null
+++ b/ssh-check
@@ -0,0 +1,74 @@
+#!/bin/bash
+
+CFG_FILE=$HOME/.config/ssh-check.list
+CFG_FILE_MAX=$((2**31-1))
+
+read SSH_OPTIONS <<END
+-o ConnectTimeout=3
+-o ControlPath=none
+-o PasswordAuthentication=no
+-o StrictHostKeyChecking=yes
+END
+
+quietly()
+{
+    "$@" </dev/null >/dev/null 2>&1
+}
+
+c ()
+{
+    local h hosts
+    read -r -N "$CFG_FILE_MAX" hosts < "$CFG_FILE"
+    if [ $# = 0 ]; then
+        set -- -4
+    fi
+    while true; do
+        {
+            for h in $hosts
+            do
+                ( if p=$(quietly ssh $SSH_OPTIONS -n "$h" -- true)
+                then
+                    echo "Succeeded: $h"
+                else
+                    echo "Failed:    $h"
+                fi ) &
+            done
+            wait
+        } | column -t -s'$'
+        tty -s && break
+        sleep 5
+    done
+}
+
+edit_config()
+{
+    set -e
+    f=$(tempfile)
+    if [ -e "$CFG_FILE" ]
+    then
+        cp "$CFG_FILE" "$f"
+    fi
+    touch -r "$f" "$f".timestamp
+    $EDITOR "$f"
+    [ -e "$f" -a "$f" -nt "$f".timestamp ]
+    mv "$f" "$CFG_FILE"
+    set +e
+    rm "$f".timestamp
+}
+
+while [ $# -gt 0 ]
+do
+    case "$1" in
+        --edit) edit_config; exit ;;
+        --) shift; break;;
+        *) exit 1 ;;
+    esac
+    shift
+done
+
+if [ -t 0 ] && ! [ -e "$CFG_FILE" ]
+then
+    edit_config
+fi
+
+c "$@"
-- 
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