Main script:
Create the following script as the source for your progress/bouncing bar (I called it bash-progress):
#!/bin/bash
# Initial configuration variables
# Set time interval for progress delay (in fraction of seconds)
time_delay=".2"
# Set left and right brackets (1 character)
lb="["
# lb="("
# lb=" "
rb="]"
# rb=")"
# rb=" "
# Function to show bouncing bar while running command in the background
show_bouncer() {
# If no argument is given, then this is run on the last command - else provide PID
if [[ -z $1 ]]
then
PID=$!
else
PID=$1
fi
ii=0
# Define bouncer array (3 characters)
bo=('. ' '.. ' '...' ' ..' ' .' ' ..' '...' '.. ')
# bo=('⠄ ' '⠂⠄ ' '⠁⠂⠄' '⠂⠂⠂' '⠄⠂⠁' ' ⠄⠂' ' ⠄' ' ')
# bo=('⡇ ' '⣿ ' '⣿⡇ ' '⢸⣿ ' ' ⣿⡇' ' ⢸⡇' ' ⡇' ' ')
# True while the original command is running
while [[ -d "/proc/$PID" ]]
do
ch="${bo[(ii++)%${#bo[@]}]}"
printf "%b" " ${lb}${ch}${rb}"
sleep "$time_delay"
# Adjust backspaces to bouncer length + 3
printf "\b\b\b\b\b\b"
done
}
The script can work in 2 ways: Either by using the PID of the last command run, or with a given PID. The most common use is with the last command.
Using it:
So you simply create your other script like this:
#!/bin/bash
# Include Bash progress bars - or include the entire source in your script.
source "./bash-progress"
your_command_here &
show_bouncer
It's important to run the command in the background, since it then moves on immediately to show the bouncer.
You can easily test it with a sleep command:
#!/bin/bash
# Include Bash progress bars - or include the entire source in your script.
source "./bash-progress"
sleep 5 &
show_bouncer
Bonus info:
To use with a PID other than the last one, you can use pgrep (-n for newest and -x for exact match) to find the latest instance of the process like this:
#!/bin/bash
# Include Bash progress bars - or include the entire source in your script.
source "./bash-progress"
your_command &
do_something_else
do_anything_meanwhile
show_bouncer $(pgrep -nx "your_command")
