allow for more parameters, including ability to read hosts list from file

1 files 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>&-
 }