Make your terragrunt output useful

.bash_profile

# Put this function in your ~/.bash_profile or similar and use `terragrunt` as before.

# From: https://github.com/gruntwork-io/bash-commons/blob/master/modules/bash-commons/src/array.sh
# Returns 0 if the given item (needle) is in the given array (haystack); returns 1 otherwise.
array_contains() {
  local -r needle="$1"
  shift
  local -ra haystack=("$@")

  local item
  for item in "${haystack[@]}"; do
    if [[ "$item" == "$needle" ]]; then
      return 0
    fi
  done

  return 1
}

terragrunt() {
  local action=$1
  shift 1

  # For older version of Terragrunt
  # command terragrunt $action "$@" 2>&1 | sed -E "s|$(dirname $(pwd))/||g;s|^\[terragrunt\]( [0-9]{4}/[0-9]{2}/[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2})* ||g;s|(\[.*\]) [0-9]{4}/[0-9]{2}/[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}|\1|g"

  # Notes:
  # 2>&1   - may not work when input is expected from users
  # GNU versions of xargs, realpath is used

  if array_contains "$action" "plan" "apply" "destroy" "run-all" "plan-all" "apply-all" "destroy-all"; then
      command terragrunt $action -lock=false -compact-warnings --terragrunt-log-level error --terragrunt-include-module-prefix --terragrunt-use-partial-parse-config-cache --terragrunt-include-external-dependencies "$@" 2>&1 | sed -E "s|^\[([^ ]+)\](.*)|\1#\2|" | gxargs -I '{}' sh -c 'input="{}"; IFS="#" read -r path rest <<< "$input"; printf "[%s]%s\n" $(grealpath --zero --relative-to=$(pwd) "$path") "$rest";'
  else
      # Default: nothing special
      command terragrunt $action --terragrunt-include-module-prefix --terragrunt-use-partial-parse-config-cache "$@"
  fi
}

@antonbabenko sorry for the delay.

I'm using mac as well, no output for sed --version though.
The command that works for me is not via .bash_profile, but added to the actual terragrunt command. For example:
terragrunt plan-all 2> >(grep -v "\[terragrunt]" >&2)

I took this suggestion from one of the terragrunt github issues, though it would be nicer to use the .bash_profile solution.

I guess you are missing gnu-sed which you can get via brew install gsed.

The default sed on Mac really does not work:

$ /usr/bin/sed --version
/usr/bin/sed: illegal option -- -

@antonbabenko i've installed gsed but it's still not working, and the solution which i've been using doesn't work anymore as well.

Looks like the Terragrunt output was changed in one of the latest versions, and now instead of [terragrunt] the output contains [path/to/dir], so the grep/sed doesn't work anymore.