pdftotext command

# To convert 'filename.pdf' to plain text and print it to standard output:
pdftotext <filename.pdf> -

# To convert 'filename.pdf' to plain text and save it as 'filename.txt':
pdftotext <filename.pdf>

# To convert 'filename.pdf' to plain text and preserve the layout:
pdftotext -layout <filename.pdf>

# To convert 'input.pdf' to plain text and save it as 'output.txt':
pdftotext <input.pdf> <output.txt>

# To convert pages 2, 3 and 4 of 'input.pdf' to plain text and save them as 'output.txt':
pdftotext -f <2> -l <4> <input.pdf> <output.txt>