How to base64 encode image in linux bash / shell

Question

I\'m trying to base64 encode an image in a shell script and put it into variable:

test=\"$(printf DSC_0251.JPG | base64)\"
echo $test
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Answer 1

There is a Linux command for that: base64

base64 DSC_0251.JPG >DSC_0251.b64

To assign result to variable use

test=`base64 DSC_0251.JPG`

Answer 2

If you need input from termial, try this

lc=`echo -n "xxx_${yyy}_iOS" |  base64`

-n option will not input "\n" character to base64 command.

Answer 3

Single line result:

base64 -w 0 DSC_0251.JPG

For HTML:

echo "data:image/jpeg;base64,$(base64 -w 0 DSC_0251.JPG)"

As file:

base64 -w 0 DSC_0251.JPG > DSC_0251.JPG.base64

In variable:

IMAGE_BASE64="$(base64 -w 0 DSC_0251.JPG)"

In variable for HTML:

IMAGE_BASE64="data:image/jpeg;base64,$(base64 -w 0 DSC_0251.JPG)"

Get you readable data back:

base64 -d DSC_0251.base64 > DSC_0251.JPG 

See: http://www.greywyvern.com/code/php/binary2base64

Answer 4

Base 64 for html:

file="DSC_0251.JPG"
type=$(identify -format "%m" "$file" | tr '[A-Z]' '[a-z]')
echo "data:image/$type;base64,$(base64 -w 0 "$file")"

Answer 5

To base64 it and put it in your clipboard:

file="test.docx"
base64 -w 0 $file  | xclip -selection clipboard

Answer 6

You need to use cat to get the contents of the file named 'DSC_0251.JPG', rather than the filename itself.

test="$(cat DSC_0251.JPG | base64)"

However, base64 can read from the file itself:

test=$( base64 DSC_0251.JPG )