Add runx func. + env.vars. in ~/.bashrc to improve it

.bashrc

# Good run x times function to have readily available in cmd line to
# just do: $ runx 10 cmd args <- run 10 times cmd with args
function runx() {
   for ((n=0;n<$1;n++))
     do ${*:2}
   done
}

# The py_envs can help add a python path before running python or jupyter
# It is used as $ py_envs jupyter notebook
function py_envs() {
PYTHONPATH="$PYTHONPATH:/home/andmax/proj/build-rel/lib/python:/home/andmax/opencv/build/lib/python3" $*
}

# The list_exts can list all unique extensions from current directory,
# it searches and lists recursively
function list_exts() {
find . -type f | sed -rn 's|.*/[^/]+\.([^/.]+)$|\1|p' | sort -u
}

# Good hack to be able to run nvprof in Ampere-based GPUs
export __CUDA_PROF_ENABLE_AMPERE=1

# Good env. vars. to try prevent emacs producing scattered garbage
# characters while running in no-X mode (emacs -nw), it appears
# to be due to special characters in files when opened by emacs,
# close the file and clean with ctrl-l may fix it
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
export LANGUAGE=en_US.UTF-8