When I use SBCL's run-program function to run a Unix command from the Slime REPL and the command produces a lot of output, I get a run time error.  A sample acktrace is included below.  Examples are: (sb-ext:run-program "/bin/cat" '("/etc/bash_completion")                    :output *terminal-io* :search t :wait t) or (sb-ext:run-program "/bin/cat" '("/etc/bash_completion")                    :output *standard-output* :search t :wait t) If I collect the output into a string and then print the string, everything works fine: (progn  (princ   (with-output-to-string (out)     (sb-ext:run-program "/bin/cat" '("/etc/bash_completion")                         :output out :search t :wait t))   *terminal-io*)  nil) My goal is to see the command's output as it's generated.  Does anyone know how to do this? bob ==================== non-empty buffer when EOF reached while reading from child: #(99                                                              117                                                              114                                                              32                                                              41                                                              32                                                              41                                                              10                                                              9                                                              9                                                              ...)   [Condition of type SIMPLE-ERROR] Restarts:  0: [ABORT] Abort sending output to Emacs.  1: [RETRY] Retry SLIME REPL evaluation request.  2: [ABORT] Return to SLIME's top level.  3: [ABORT] Exit debugger, returning to top level. Backtrace:  0: ((LAMBDA (SB-IMPL::FD)) #<unavailable argument>)  1: (SB-IMPL::SUB-SUB-SERVE-EVENT 0 200000)  2: (SB-IMPL::SUB-SERVE-EVENT 0 200000 NIL)  3: ((LAMBDA (SWANK-BACKEND::STREAMS &OPTIONAL SWANK-BACKEND::TIMEOUT)) (#<SB-SYS:FD-STREAM for "a socket" {B36B031}>) NIL)  4: (SWANK::WAIT-FOR-EVENT/EVENT-LOOP (:EMACS-PONG 16) NIL)  5: (SWANK::WAIT-FOR-EVENT (:EMACS-PONG 16) NIL)  6: (SWANK::SEND-USER-OUTPUT ..)  7: ((LAMBDA ()))  8: ((LAMBDA ()))  9: ((SB-PCL::FAST-METHOD STREAM-FINISH-OUTPUT (SWANK-BACKEND::SLIME-OUTPUT-STREAM)) #(3 NIL 2 NIL 5 NIL ...) #<unavailable\  argument> #<SWANK-BACKEND::SLIME-OUTPUT-STREAM {AAB0BF1}>)  10: ((LAMBDA ()))  11: ((SB-PCL::FAST-METHOD STREAM-WRITE-STRING (SWANK-BACKEND::SLIME-OUTPUT-STREAM T)) ..)  12: (SB-IMPL::%WRITE-STRING ..)  13: ((LAMBDA (SB-IMPL::FD)) #<unavailable argument>)  14: (SB-IMPL::SUB-SUB-SERVE-EVENT 1 0)  15: (SB-IMPL::SUB-SERVE-EVENT 1 0 NIL)  16: (SB-SYS:SERVE-ALL-EVENTS 1)  17: (PROCESS-WAIT #<SB-IMPL::PROCESS 9630 :SIGNALED> NIL)  18: (RUN-PROGRAM "/bin/cat" ("/etc/bash_completion"))[:EXTERNAL]  19: (SB-INT:SIMPLE-EVAL-IN-LEXENV (RUN-PROGRAM "/bin/cat" '("/etc/bash_completion") :OUTPUT *STANDARD-OUTPUT* :SEARCH ...) \ #<NULL-LEXENV>)  20: (SWANK::EVAL-REGION "(sb-ext:run-program \"/bin/cat\" '(\"/etc/bash_completion\") :output *standard-output* :search t :\ wait t)\n")  21: ((LAMBDA ()))  22: (SWANK::TRACK-PACKAGE #<CLOSURE (LAMBDA #) {B05A8AD}>)  23: (SWANK::CALL-WITH-RETRY-RESTART "Retry SLIME REPL evaluation request." #<CLOSURE (LAMBDA #) {B05A83D}>)  24: (SWANK::CALL-WITH-BUFFER-SYNTAX NIL #<CLOSURE (LAMBDA #) {B05A825}>)  25: (SWANK::REPL-EVAL "(sb-ext:run-program \"/bin/cat\" '(\"/etc/bash_completion\") :output *standard-output* :search t :wa\ it t)\n")