tesseract

TLDR

Recognize text in an image and save it to output.txt (the .txt extension is added automatically)

$ tesseract [image.png] [output]

Specify a custom language (default is English) with an ISO 639-2 code (e.g. deu = Deutsch = German)

$ tesseract -l deu [image.png] [output]

List the ISO 639-2 codes of available languages

$ tesseract --list-langs

Specify a custom page segmentation mode (default is 3)

$ tesseract -psm [0_to_10] [image.png] [output]

List page segmentation modes and their descriptions

$ tesseract --help-psm