feat: spread tool

servers.txt

@@ -0,0 +1,5 @@
+link
+keymaker
+apoc
+kid
+mouse

tools/spread.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+# spread command over multiple servers
+
+SPREAD_SERVERS=${SPREAD_SERVERS:-}
+SPREAD_SERVERS_FILE=${SPREAD_SERVERS_FILE:-servers.txt}
+SPREAD_USER=${SPREAD_USER:-$USER}
+SPREAD_COMMAND=${SPREAD_COMMAND:-}
+
+while getopts "s:f:u:" opt; do
+    case $opt in
+    s)
+        SPREAD_SERVERS="$SPREAD_SERVERS $OPTARG"
+        ;;
+    f)
+        SPREAD_SERVERS_FILE="$SPREAD_SERVERS_FILE $OPTARG"
+        ;;
+    u)
+        SPREAD_USER="$OPTARG"
+        ;;
+    \?)
+        echo "Invalid option: -$OPTARG" >&2
+        ;;
+    esac
+done
+shift $((OPTIND - 1))
+
+if [ -n "$1" ]; then
+    SPREAD_COMMAND="$@"
+fi
+
+if [ -f $SPREAD_SERVERS_FILE ]; then
+    SPREAD_SERVERS="$SPREAD_SERVERS $(cat $SPREAD_SERVERS_FILE)"
+fi
+
+if [ -z "$SPREAD_SERVERS" ]; then
+    echo "No servers specified"
+    exit 1
+fi
+
+if [ -z "$SPREAD_COMMAND" ]; then
+    echo "No command specified"
+    exit 1
+fi
+
+_ssh() {
+    ssh \
+        -l $SPREAD_USER \
+        -o ConnectTimeout=5 \
+        $1 \
+        "$SPREAD_COMMAND"
+}
+
+for server in $SPREAD_SERVERS; do
+    # while loop so we get:: $SPEAD_USER@$server: <output>
+    case ${SPREAD_LOG_STYLE:-prefixed} in
+        prefixed)
+            _ssh $server | while read -r line; do
+                printf "%s@%-10s: %s\n" "$SPREAD_USER" "$server" "$line"
+            done
+            ;;
+        header)
+            printf "\n%s@%s\n---\n" "$SPREAD_USER" "$server"
+            _ssh $server
+            ;;
+        *)
+            _ssh $server
+            ;;
+    esac
+done