From 86e1187a63680a2e1a139a33dfa7f73f84528eb7 Mon Sep 17 00:00:00 2001
From: James Pannacciulli <jpnc@jpnc.info>
Date: Fri, 23 Jan 2015 14:23:56 -0800
Subject: allow for more parameters, including ability to read hosts list from
 file

---
 pars.sh | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/pars.sh b/pars.sh
index 79bc905..4e3544e 100644
--- a/pars.sh
+++ b/pars.sh
@@ -1,14 +1,38 @@
 #!/bin/bash
 
 parssh () {
-    [[ "$1" == -[0-9]* && "$1" != *[^0-9-]* ]] && {
-      local parssh_concurrency=${1#-}
-      shift
+    while [[ "$1" == -* ]]; do
+        case ${1#-} in
+            [0-9]*)
+                [[ "${1#-}" != *[^0-9]* ]] && {
+                    local parssh_concurrency=${1#-}
+                    shift
+                }
+            ;;
+            fo|fouter)
+                [[ -f "$2" ]] || {
+                    echo "'$2': invalid file name"
+                    return 99
+                }
+                local parssh_fouter="$2"
+                shift
+                shift
+            ;;
+        esac
+    done
+
+    [[ -z "$parssh_fouter" ]] && {
+        exec 9<&0
+    } || {
+        echo "reading $parssh_fouter"
+        exec 9<"$parssh_fouter"
     }
+                
     while read host; do
         while (( $(jobs -pr | wc -l) >= ${parssh_concurrency:-4} )); do
             sleep 1;
         done;
         ssh -no StrictHostKeyChecking=no $host "$@" &
-    done
+    done <&9
+    exec 9>&-
 }
-- 
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