rename: fix 'rename' command has two different versions

pages/common/rename.md → pages/linux/rename.md

@@ -1,6 +1,7 @@
 # rename
 
 > Renames multiple files.
+> This is the perl version of `rename`, which is the default on Debian. See `rename.ul` for the stand-alone version.
 
 - Rename files using a Perl Common Regular Expression (substitute 'foo' with 'bar' wherever found):
 

pages/linux/rename.ul.md

@@ -0,0 +1,29 @@
+# rename.ul
+
+> Renames multiple files.
+> This is the util-linux version of `rename`. See `rename` for the perl version which is default on Debian.
+> Warning: The renaming has no safeguards and will overwrite files without any questions.
+
+- Rename files using simple substitutions (substitute 'foo' with 'bar' wherever found):
+
+`rename {{foo}} {{bar}} {{*}}`
+
+- Dry-run - display which renames would occur without performing them:
+
+`rename -vn {{foo}} {{bar}} {{*}}`
+
+- Do not overwrite existing files:
+
+`rename -o {{foo}} {{bar}} {{*}}`
+
+- Change file extensions:
+
+`rename {{.ext}} {{.bak}} *.foo`
+
+- Prepend all files with 'foo':
+
+`rename '' 'foo' {{*}}`
+
+- Rename 'foo1', ..., 'foo10', ..., 'foo100' to 'foo001', ..., 'foo010', ..., 'foo100':
+
+`rename {{foo}} {{foo00}} {{foo?}} && rename {{foo}} {{foo0}} {{foo??}}`