md-command-line / errorscream

stdout to error

Using ErrorScream

You can source the script in your bashrc. Or write an alias to source the script for your particular terminal session.

Want to mess with a developer on your team? Put this in their bashrc. 🤡

Program will do no harm to your computer.

How does it work?
trap <code> ERR
Runs a line of code if there is an error before presenting the output of your command.
This project traps on err and uses say for a mac to shout the last entry of the history command.

Installation

git clone https://github.com/MichaelDimmitt/ERRORSCREAM.git; cd ERRORSCREAM; cat scream_we_all_scream_for_sh.sh; . scream_we_all_scream_for_sh.sh;

errorscream's Issues

Solution for Error Scream summarized

It works!

Solution

trap 'say $(history | tail -1 | cut -c 8-) failed with error code $?' ERR

notes:

PROMPT_COMMAND='echo "$(history | tail -1 | cut -c 8-)"'
trap 'say $BASH_COMMAND failed with error code $?' ERR

global config to be a variable that drives say to be on or off.

trap on exit vs trap on err

link: https://medium.com/@dirk.avery/the-bash-trap-trap-ce6083f36700

#!/bin/bash
set -e
trap 'catch $? $LINENO' EXIT
catch() {
  echo "catching!"
  if [ "$1" != "0" ]; then
    # error handling goes here
    echo "Error $1 occurred on $2"
  fi
}
simple() {
  badcommand
  echo "Hi from simple()!"
}
simple
echo "After simple call"

Do this so it will work; or the other things listed 😋

trap on debug lets you evaluate every single command 😅

example:

trap date DEBUG

Prompt command causes a command to run after every command.

example:

PROMPT_COMMAND=date

useful resources:
https://stackoverflow.com/questions/45123034/execute-command-after-every-command-in-bash
side note - did you know bash is written in c? https://github.com/gitGNU/gnu_bash

Check error codes and make sure everything works.

error_message(){
  # per request:
  say 'MICHAEL SCOTT "no GOD NOO"'
  ## future case, support different voices by changing mac defaults.
  say $@
  ## say $1 $2
}
check_errs()
{
  if [ "${1}" -ne "0" ]; then
	error_message "${1}" "${2}"
    # as a bonus, make our script exit with the right error code.
    exit ${1}
  fi
}
check_errs $?

useful link:
https://www.shellscript.sh/exitcodes.html