reorg bash

bash/rename.sh

@@ -0,0 +1,43 @@
+# rename : renames the string descriptor used in numbered series.
+
+# Usage:
+
+# > rename 100.md bar
+# or
+# > rename 100.foo.md bar
+
+# is equivalent to:
+# > mv 100.md 100.bar.md
+# > mv 100.foo.md 100.bar.md
+
+# split the args by a newline so that awk reads them as separate "records"
+mvcmd=`echo "$1
+$2" |
+awk '
+BEGIN {
+  # Builtin variable, "field seperator". The neatness of this is the main reason
+  # I use awk to parse the filename.
+  FS="."
+  oldname = ""
+  num = ""
+  ext = ""
+  newname = ""
+}
+
+NR == 1 {
+  oldname = $0
+  num = $1
+  # important that this is the last field, not numbered, to allow for a file
+  # without a string descriptor.
+  ext = $NF
+}
+
+NR == 2 {
+  newname = sprintf("%s.%s.%s", num, $0, ext)
+}
+
+END {
+  print oldname, newname
+}
+'`
+mv $mvcmd