fixed xargs errors + added own examples

sheets/xargs

@@ -0,0 +1,14 @@
+# find all file name ending with .pdf and remove them
+find -name \*.pdf | xargs rm
+
+# if file name contains spaces you should use this instead
+find -name \*.pdf | xargs -I{} rm -rf '{}'
+
+# Will show every .pdf like:
+#	&toto.pdf=
+#	&titi.pdf=
+# -n1 => One file by one file. ( -n2 => 2 files by 2 files )
+find -name \*.pdf | xargs -I{} -n1 echo '&{}='
+
+# group words by three in a string
+seq 1 10 | xargs -n3 echo