add dripfeed.sh

Signed-off-by: Colin McCabe <cmccabe@alumni.cmu.edu>

diff --git a/dripfeed.sh b/dripfeed.sh
new file mode 100755 (executable)
index 0000000..3b229a7
--- /dev/null
+++ b/dripfeed.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+
+#
+# dripfeed.sh
+#
+# A script to perform several actions at a time from a file.
+#
+# Colin McCabe
+#
+
+die() {
+    echo $1
+    exit 1
+}
+
+usage() {
+    cat <<EOF
+dripfeed.sh: read actions from a file and do them.
+-f [file]: set input file
+-h: this help
+-p [number of processes]: set number of processes to use
+EOF
+}
+
+dripfeed() {
+    while true; do
+        for (( nline=1; nline <= ${nlines}; nline++ )) do 
+            nline_text=$(printf '%03d' ${nline})
+            [ $? -ne 0 ] && die "printf failed for ${nline}"
+            mkdir ${nline_text} &>/dev/null && break
+        done
+        echo "nline = $nline, nlines = $nlines"
+        [ $nline -gt $nlines ] && exit 0
+        line=$(head -n ${nline} ${input_file} | tail -n 1)
+        echo $line
+        $line
+    done
+}
+
+input_file=""
+num_procs=1
+while getopts  "f:hp:" flag; do
+    case $flag in
+    f)  input_file=$OPTARG;;
+    h)  usage; exit 0;;
+    p) num_procs=$OPTARG;;
+    *)  echo "getopts error"
+        echo
+        usage
+        exit 1;;
+    esac
+    #echo "$flag" $OPTIND $OPTARG
+done
+[ x${input_file} == x ] && die "you must supply an input file with -f"
+nlines=$(wc -l "${input_file}" | awk '{ print $1 }')
+[ $? -ne 0 ] && die "wc -l ${input_file} failed"
+
+for (( idx=0; idx < ${num_procs}; idx++ )) do 
+    { dripfeed; } &
+done
+wait
+
+exit 0