Exif, stands for Exchangeable image file format, which we usually use to recognize the camera manufacturer, model, exposure time in a digital photo, it is a standard that specifies the formats for images, sound, and ancillary tags used by digital cameras (or digital devices in nowadays, like smart phones and tablets), scanners and other systems handling image and sound files recorded by digital cameras.
Exif can help us know more about the photos and audios, but may also leaks the valuable and privacy info if you don’t want to let others know that you just want to share pictures with others, it will also cost a small disk space, but if you don’t need it or you don’t want it, it’s also a waste of disk space, so you may want to remove that info like me in some situation. Here is the steps to remove Exif under command line.
$ exiftool -ver # show the installed version of exiftool
If you would like to see the current exist info, use this command, filename.jpg is the picture you want to manipulate:
$ exiftool -all filename.jpg
Now you can remove Exif info:
$ exiftool -all= filename.jpg
By default, it will backup your file to filename_oringinal, like filename.jpg -> filename.jpg_original, so you don’t need to worry about the backup, if you don’t want it, you can also add parameter -overwrite_original to prevent to backup file been generated.
After you remove the Exif info, you will find the modified file be a little bit smaller now.
$ exiftool -all= filename.JPG
1 image files updated
$ ls -l
-rw-r--r-- 1 peter peter 1609796 Apr 24 16:09 filename.jpg
-rw-r--r-- 1 peter peter 1614079 Apr 24 16:08 filename.jpg_original
If you take a look at its info, you will find that there are only some basic info remaining:
$ exiftool -all filename.jpg
ExifTool Version Number : 10.10
File Name : DSC_0470.JPG
Directory : .
File Size : 1572 kB
File Modification Date/Time : 2016:04:24 16:09:43+08:00
File Access Date/Time : 2016:04:24 16:09:43+08:00
File Inode Change Date/Time : 2016:04:24 16:09:43+08:00
File Permissions : rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
Image Width : 3920
Image Height : 2204
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 3920x2204
Megapixels : 8.6
xclip is command line interface to X selections/clipboard that is designed to run on any system with any X11 implementation, with xclip, we can not easily manipulate the data on the clipboard under a terminal in X11, no need to open a file for just copy its content anymore, and no need to move the mouse to select the output and copy it anymore. Except xclip, there is also a similar program called xsel, google it if you are interested in.
It’s very to install xclip via apt-get under Debian / Ubuntu based GNU/Linux distros or via pkgng under FreeBSD: [bash] $ sudo apt-get install xclip # on Debian / Ubuntu based GNU/Linux distros $ sudo pkg install xclip # on FreeBSD [/bash]
So how to use it?
If you want to copy something to clipboard, just pipe to xclip like this: [bash] $ echo “Hello xclip” | xclip -selection clipboard [/bash]
Now you can paste it as usual.
If you want to show something from clipboard, just call xclip to output:
[bash] $ xclip -selection clipboard -o [/bash]
xclip will output to standard output (stdout), so you can pipe or redirect the result to other utility and do some works you want.