====== BASH - Files - Copy files to different directory ======

<code bash>
#!/bin/bash                                                                                                                                                                                                 

for filename in *; do
  if [[ -f "$filename" ]]; then
    base=${filename%.*}
    ext=${filename#$base.}
    mkdir -p "${ext}"
    mv "$filename" "${ext}"
  fi
done
</code>

----

===== Copy all files by extension to single directory =====

<code bash>
find . -name \*.txt -exec cp {} someDirectory \;
</code>

or

<code bash>
find . -name "file*" -exec mv {} /tmp \;
</code>

<WRAP info>
**NOTE:**  The open brackets **{}** are a placeholder for the argument which is to be used from the output of find.
</WRAP>

<WRAP info>
**NOTE:**  Why not just use **mv file* /tmp**.

  * Problem with Moving Large Number of Files
    * Linux systems have a predefined limit on the maximum number of arguments that can be used with a single command.
    * This limit varies from system to system based on the stack size.
    * Thus, if a very high number of files are being specified with the wildcard; e.g. over a hundred thousand files, it throws an error: **Argument list too long**.

</WRAP>

----