read-line

(read-line &optional stream)

Reads one line of text and returns it as a string with the trailing newline removed (a CRLF line ending also loses its carriage return, like Java's BufferedReader.readLine -- so CRLF-terminated input such as HTTP over a rontolisp:tcp-connect socket reads as plain lines). With no argument it reads from standard input; given a stream opened by open or with-open-file it reads the next line from that stream. At end of input it returns nil rather than signalling an error. Works in all three backends; unlike read, it returns the raw line without parsing it as an S-expression.

(print (read-line))

Typing hello world on standard input makes read-line return the string "hello world". When the input is exhausted it returns nil, which is the usual loop-termination test when reading a file line by line.