“base64” Command Usage Examples in Linux

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This tutorial explains Linux “base64” command, options and its usage with examples.

base64 – base64 encode/decode data and print to standard output.

DESCRIPTION

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Base64 encode or decode FILE, or standard input, to standard output.

SYNOPSIS

base64 [OPTION] [FILE]

OPTIONS

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-w, –wrap=COLS
Wrap encoded lines after COLS character (default 76). Use 0 to disable line wrapping.
-d, –decode
Decode data.
-i, –ignore-garbage
When decoding, ignore non-alphabet characters.

EXAMPLES

1. To encode text to base64, use the following

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$ echo 'this is sanfoundry linux tutorial' | base64
dGhpcyBpcyBzYW5mb3VuZHJ5IGxpbnV4IHR1dG9yaWFsCg==

2. To decode, use base64 -d.

$ echo 'dGhpcyBpcyBzYW5mb3VuZHJ5IGxpbnV4IHR1dG9yaWFsCg==' | base64 -d
this is sanfoundry linux tutorial

3. Wrap lines while encoding using -w option

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$ echo 'this is sanfoundry linux tutorial' | base64 -w 10
dGhpcyBpcy
BzYW5mb3Vu
ZHJ5IGxpbn
V4IHR1dG9y
aWFsCg==

Here i have wrapped the output to line characters per line.

4. base64 encode and decode a file

$ cat file1.txt
abc
def
ghi
$ base64 file1.txt
YWJjCmRlZgpnaGkK
$ echo 'YWJjCmRlZgpnaGkK' | base64 -d
abc
def
ghi

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If you wish to look at all Linux commands and their usage examples, go to Linux Commands Tutorial.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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