How to add a simple progress bar in shell script?
At times, we need to write shell scripts that are interactive and user executing them need to monitor the progress. For such requirements, we can implement a simple progress bar that gives an idea about how much task has been completed by the script or how much the script has executed.
How to check the progress of a process in Bash?
If this facility is available, you can pipe your input through dd to monitor the number of bytes processed. Alternatively, you can use lsof to obtain the offset of the file’s read pointer, and thereby calculate the progress. I’ve written a command, named pmonitor, that displays the progress of processing a specified process or file.
How to capture the output of the progress bar?
@DavidD’s comments on Pez Cuckows answer, this is an example of how you can capture the output of the progress bar in a script and still see the spinner on the screen:
How to calculate the progress of a file in Linux?
On Linux systems some commands will respond similarly to SIGUSR1. If this facility is available, you can pipe your input through dd to monitor the number of bytes processed. Alternatively, you can use lsof to obtain the offset of the file’s read pointer, and thereby calculate the progress.
Why do I need a progress bar in JavaScript?
If your script needs to wait a while, particularly if it needs to wait for a fixed amount of time, this little progress bar may be of help. For example, you may need to wait for some external process, such as some remote web service, to complete, but you want to give the user something to watch to show that the script has not died.
How can I provide a bash progress indicator?
Closed 2 years ago. Using a bash only script, how can you provide a bash progress indicator? For example, when I run a command from bash – while that command is executing – let the user know that something is still happening.