added sponge from moreutils

bin/sponge

@@ -0,0 +1 @@
+../files/sponge

files/sponge

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import sys
+from argparse import ArgumentParser
+
+# Set up options
+parser=ArgumentParser(description="Sponge file before writing output: grep foo file.txt | sponge file.txt",
+                      epilog="This tool is a modification from http://joeyh.name/code/moreutils/ with the same name.")
+parser.add_argument("-a",action="store_true",dest="append",default=False,
+                  help="Append to file instead of overwriting")
+parser.add_argument(type=str,dest="file",
+                  help="File to write to")
+options=parser.parse_args()
+
+# Read data
+data=sys.stdin.read()
+
+# choose mode
+mode="w"
+if options.append:
+    mode="a"
+# Write the file
+writer=open(options.file, mode)
+writer.write(data)
+writer.close()