05_bash_examples.txt

# 5. Job Control 

# Running processes in the background

# Start a sleep and interrupt it
sleep 30
# Ctrl-C

# Start a sleep 
sleep 50
# Suspend current job
# Ctrl-Z
# Background that job
set +e
bg
# Bring it back into the foreground
fg
# Ctrl-C

# Make new sleep job and put in the background
sleep 120 &
# Bring sleep job back to foreground
fg 1
# Ctrl-C
set -e

# Processes

# List running processes in current shell
ps 

# List all processes belonging to you running on this machine
ps -u
ps -uf

# List all processes
ps -a
ps -af

# Start a sleep process in the background, grab it's process id
# (last PID is stored in $!), then kill it and confirm it is dead
sleep 600 &
pid=$!
echo "Sleep process pid = $pid"
ps 
kill $!
ps

# Kill sends signals to processes, which they can choose to ignore.
# Can specify the signal to send, and "kill -9" will kill just about
# anything, but may prevent graceful cleanup

# tmux is quite advanced, but beyond the scope of this lesson except
# to say it is useful if you need to resume your work between different
# physical locations