base64 on Unix systems

How get base64 from any file ?

Write to output

cat var/tmp/myFile.txt | base64

Or write to file

cat var/tmp/myFile.txt | base64 > var/tmp/decodedFile.txt

How decrypt base64 file ?

Write to output

cat base64encoded.txt | base64 -d

Write to file

cat base64encoded.txt | base64 -d > var/tmp/decodedFile.txt

How get base64 from any string ?

echo hello | base64

How decrypt base64 string to decoded string ?

echo aGVsbG8K | base64 -d