Files

Attributes

Size

Human readable (h):

ls -lhrt

Type

$ man file
...file - determine file type
...
$ file temp/myfile.zip
temp/myfile.zip: Zip archive data, at least v1.0 to extract
$ file temp/logs/logger.log
temp/logs/logger.log: ASCII English text
$

Duplicate

To remove duplicate files e.g. photos:

apt-get install fdupes

Find and remove duplicate files:

fdupes -rdN .

Warning

The d option will delete the duplicate files.

r

option makes fdupes search for files recursively.

d

option makes fdupes delete duplicates.

N

option, when used together with d, preserve the first file in each set of duplicates and delete the others without prompting the user.

To move photos into folders:

sudo apt-get install libimage-exiftool-perl
exiftool "-filename=%f%c.%e" '-Directory<CreateDate' -d %Y/%Y-%m -r .

Note

The %c should add a copy number if exiftool finds a duplicate filename.

Remove olde Windows ini files:

find . -type f -name "Thumbs.db" -exec rm -f {} \;
find . -type f -name "Picasa.ini" -exec rm -f {} \;

To remove all empty directories under the current directory:

find . -type d -empty -delete

Script

Shebang (Unix), the #! syntax used in scripts to indicate an interpreter for execution.

The Whole Shebang, or What’s in a Script

First, the file needs to specify which type of shell environment should be created to execute the shell script’s commands. This is done as a special notation on the first line of the shell script. The line begins with a number sign (#), then an exclamation point (!), followed by the exact executable shell program on this computer’s filesystem.

Below, this new line is inserted into our sample script file:

#!/bin/bash
date

python

#!/usr/bin/env python