block output of debugged program (gdb)

Yes, you will see all output from your program.

You can disable this by sending it off elsewhere. For example:

(gdb) run > /dev/null

Ignore stdout and stderr

run &>/dev/null

Analogous to the Bash syntax.

Tested on GDB 7.10.

If you just want to see the output of the program as you step through it without gdb's output, this script can be useful.

#!/bin/bash
file=$1
delay=1 #seconds
lastTime=`stat --printf=%y "$file"`

while [ 1 ]
do
  thisTime=`stat --printf=%y "$file"`
  if [ "$thisTime" != "$lastTime" ]
  then
    clear
    cat "$file"
  fi
  lastTime="$thisTime"
  sleep $delay
done

lastTime="$thisTime" sleep $delay done