Run program in the background unix

I want this program run in the background like rngd service I can't do this because I don't know so much about Linux. That way your script continues, or you restore control immediately, while a new background task of the script starts, with two commands: sleep, and echo. To that wit, where I found it actively useful. In an embedded device I develop there's the main application that works with a watchdog.

If it fails in a way that triggers the watchdog reset soon after startup, repeatedly, it's hard to fix remotely as the period between the OS start and the reset is quite short, not enough to ssh in, and block the app startup. So I need a way to determine the system restarted so fast and introduce a delay if it did, to give myself time to fix it manually. Otherwise restart will be quick, without delay. If you want something to run in 5 minutes, but the rest of your program to continue or finish , you need to background the sleep as well:.

This will print hello and then 3 seconds later after the main program has exited , print world. Sign up to join this community.

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Create a free Team What is Teams? Learn more. How to run a command in the background with a delay? Ask Question. Asked 8 years, 1 month ago. Active 6 years ago. This will execute as a foreground process. We get the expected results, scrolling down the terminal window. It will become a background task. We get control of the terminal window returned to us. This time we are told the process is stopped. The process is now a background job.

The jobs command will list the jobs that have been started in the current terminal session. And because jobs are inevitably processes, we can also use the ps command to see them. Note that there is no need to use a hyphen - with the T option.

We can see that Bash has a state of Ss. As soon as we need it, it will respond. The ping command has a state of T. This tells us that ping has been stopped by a job control signal.

The ps T command has a state of R , which stands for running. So the ps T command is running in the foreground. The bg command is used to resume a background process. It can be used with or without a job number.

If you use it without a job number the default job is brought to the foreground. The process still runs in the background. You cannot send any input to it.

The ping command resumes and we see the scrolling output in the terminal window once more. The name of the command that has been restarted is displayed for you. This is highlighted in the screenshot. But we have a problem. So how do we stop it? We can type in the terminal window but what we type is quickly swept away by the scrolling output from the ping command.

Anything we type takes effect in the foregound. The fg command will bring a background task into the foreground. Just like the bg command, it can be used with or without a job number. Using it with a job number means it will operate on a specific job. If it is used without a job number the last command that was sent to the background is used.

If we type fg our ping command will be brought to the foreground. The characters we type are mixed up with the output from the ping command, but they are operated on by the shell as if they had been entered on the command line as usual. These are shorthand ways of using the kill command. There are 64 different signals that kill can send. Use kill -l at the command line to list them. Some of them are raised automatically by other processes within the system.

Find all posts by Corona Shell Programming and Scripting. Interactive script with background. I have script, which need some variable from user and i use below command for this read this script works fine while running without background, but when i run this script in background, it ask first variable then immediately it show below error KSH variable not found please let me Hi i need a c programm to login in unix solaris.

Use expect to run an interactive shell script? Hi all, I have a bit of a vexing issue here and I'm not certain how best to go about it. Would expect be the best way to do this? How to process and run a program in the background in perl? Hi, I have a query about processing and running Perl program at the background.

As soon as input is given the contol goes to get. Actually get. Develop Program with 'None Interactive Flag'. Hi I have created a program but am currently wondering how to develop it further.

I wanted to know how i would go about developing the program further so that it is able to run with a "none interactive flag" enabling execution to be automated with the resultant file e-mailed to a user once a week