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--- bash:files:rename_multiple_files [2021/01/26 12:32] – peter
+++ bash:files:rename_multiple_files [2022/06/13 11:33] (current) – peter
@@ Line 42: / Line 42: @@
 The actual documentation for the 's' and 'y'/'tr' operators are found in the 'perlop' manpage.
+</WRAP>
+----
+===== Add an extension =====
+<code bash>
+ls
+file1 file2 file3
+</code>
+Add the extension ".txt"
+<code bash>
+for F in $(ls);do mv $F $F.txt;done
+</code>
+Check the result:
+<code bash>
+ls
+file1.rm file2.rm file3.rm
+</code>
+----
+===== Change the extension =====
+Change the extension from ".txt" to ".mp3":
+<code bash>
+for F in $(ls);do mv $F $(echo $F|sed -e 's,\.rm,,').mp3 ;done
+</code>
+Check the result:
+<code bash>
+ls
+file1.mp3 file2.mp3 file3.mp3
+</code>
+----
+===== Remove the extension =====
+<code bash>
+for F in $(ls);do mv $F $(echo $F|sed -e 's,\.mp3,,') ;done
+</code>
+Check the result:
+<code bash>
+ls
+file1 file2 file3
+</code>
+----
+===== Only use ASCII characters =====
+<code bash>
+find . -type f -exec bash -c 'for f do d=${f%/*} b=${f##*/} nb=${b//[^A-Za-z0-9._-]/_}; [[ $b = "$nb" ]] || mv "$f" "$d/$nb"; done' _ {} +
+</code>
+<WRAP info>
+**NOTE:**  To test, use
+<code bash>
+find . -type d -exec bash -c 'for f do d=${f%/*} b=${f##*/} nb=${b//[^A-Za-z0-9._-]/_}; [[ $b = "$nb" ]] || echo mv "$f" "$d/$nb"; done' _ {} +
+</code>
+  * NOTE the **echo** statement included, which just prints out the command that will be run.
+    * To actually do the move action, just remove the **echo** part.
+</WRAP>
+<WRAP info>
+**NOTE:**  For directories use
+<code bash>
+find . -type d -exec bash -c 'for f do d=${f%/*} b=${f##*/} nb=${b//[^A-Za-z0-9._-]/_}; [[ $b = "$nb" ]] || mv "$f" "$d/$nb"; done' _ {} +
+</code>
 </WRAP>