?
Solved

Linux : view output of already running processes in linux

Posted on 2014-01-28
4
Medium Priority
?
996 Views
Last Modified: 2014-01-28
I am running a SOME shell scripts in the background that prints some progress information to the stdout ie terminal. ($ nohup perl script001.pl &)

As all these scripts takes few days to get completed  I will have to logout. This loses the output to the terminal. Is there anyway to regain the progress output for any specific process when i log back in?

I know i could pipe the output to a file, but I don't really want to do that.

Any ideas on this would be greatly appreciated

I hope you clearly  understood question, prior you give me the answer
0
Comment
Question by:mac_g
  • 2
  • 2
4 Comments
 
LVL 8

Accepted Solution

by:
Surrano earned 1600 total points
ID: 39814614
1. Use nohup. It will make sure the process keeps running even after the user session has ended.

2. Use screen and enable screen logging.

3. If you have already started then spy on file descriptors, e.g. for PID=1234:
tail -f /proc/1234/fd/1

Open in new window

0
 

Author Comment

by:mac_g
ID: 39814652
it is pefect ...

working good  ...

what is fd,1 ... in the above command ??
0
 
LVL 8

Expert Comment

by:Surrano
ID: 39814709
fd is "file descriptors" and 1 is the standard output.
0 is standard input, 2 is standard error. The rest are arbitrary file descriptors opened by the process.
0
 

Author Comment

by:mac_g
ID: 39814716
thanks for your help ...
0

Featured Post

Never miss a deadline with monday.com

The revolutionary project management tool is here!   Plan visually with a single glance and make sure your projects get done.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The purpose of this article is to demonstrate how we can upgrade Python from version 2.7.6 to Python 2.7.10 on the Linux Mint operating system. I am using an Oracle Virtual Box where I have installed Linux Mint operating system version 17.2. Once yo…
Google Drive is extremely cheap offsite storage, and it's even possible to get extra storage for free for two years.  You can use the free account 15GB, and if you have an Android device..when you install Google Drive for the first time it will give…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…
Suggested Courses
Course of the Month5 days, 17 hours left to enroll

589 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question