spipe.sh

#!/bin/bash

#####################################################################
# Alex Hogen (https://github.com/ahogen)
#
# Run the command provided, redirecting STDERR to STDOUT, effectivly
# reducing all output to a single output pipe, hence the name "spipe".
# This script is also capable of capturing some common kill codes
# and forwarding them to the child process.
#
# This script was originally written for executing some external
# programs in Julia (http://julialang.org/). These external programs
# were being silly and printing errors to stdout and "normal" output
# to stderr. To simplify matters, I wanted a singular pipe on the
# Julia side and this script was the fastest way for me to get that
# accomplished.
#####################################################################

prop_sigint() {
    kill -2 ${child}
    echo "[spipe.sh] Sent SIGINT to child process (pid ${child})"
}

prop_sigquit() {
    kill -3 ${child}
    echo "[spipe.sh] Sent SIGTERM to child process (pid ${child})"
}

prop_sigterm() {
    kill -15 ${child}
    echo "[spipe.sh] Sent SIGTERM to child process (pid ${child})"
}

# Trap and forward common termination signals to the child
trap prop_sigint SIGINT
trap prop_sigquit SIGQUIT
trap prop_sigterm SIGTERM

# Ampersand on the end tells shell not to wait for process to complete,
# but instead continue running.
#echo $@

"$@" 2>&1 &

child=$!
# Wait for child process to finish before exiting
wait ${child}
EC=$?

echo "[spipe.sh] Exiting (code: ${EC})"
exit $EC