?
Solved

unix command needed

Posted on 2010-08-25
10
Medium Priority
?
263 Views
Last Modified: 2013-12-06
I need a one line script to find the latest log filename that starts with 'System.out' from the current folder.


I need this because I am trying run the following  command  in putty

tail -100f  <need a one line script to find the latest log filename that starts with 'System.out' from the current folder>.log


0
Comment
Question by:cofactor
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
10 Comments
 
LVL 1

Expert Comment

by:MedinaExpert
ID: 33528316
tail -100f `ls -latr System.out* | cut -c 52- | tail -1`

You might have to change the 52- to adjust for you version of ls

0
 
LVL 1

Expert Comment

by:MedinaExpert
ID: 33528334
This is actually better, sorry

tail -100f `ls -latr System.out* | tr ' ' '\n' | tail -1`
0
 

Author Comment

by:cofactor
ID: 33528392
what is latr ?

what is  tr ?

why new line \n you are using ?

also there is a second tail you used ...why ?

This is a complex script . Could you please explain what it is doing ?  I'm not a Unix guy. So, could you please explain in simple way.
0
Why Off-Site Backups Are The Only Way To Go

You are probably backing up your data—but how and where? Ransomware is on the rise and there are variants that specifically target backups. Read on to discover why off-site is the way to go.

 
LVL 1

Expert Comment

by:MedinaExpert
ID: 33528543
Sure, no drama :)

tail -100f  `ls -latr System.out* | tr ' ' '\n' | tail -1`


the part between ``s is executed as a command in a command
ls -latr means Long All sorted in Time Reverse (newest listed latest)
then we change all spaces for newlines (the tr command) and only take the last line (the tail command) wich contains the last System.out* file

Hope this helps...

Cheers
0
 
LVL 48

Accepted Solution

by:
Tintin earned 200 total points
ID: 33528745
No need to over complicate it.  Just do

ls -t System.out* | tail -1

0
 
LVL 1

Expert Comment

by:MedinaExpert
ID: 33528762
true, but make it ls -t | head -1 or ls -tr | tail -1 to get the newest.
0
 

Author Comment

by:cofactor
ID: 33529085
>>>No need to over complicate it.  Just do
ls -t System.out* | tail -1

does it  show the latest ?
0
 
LVL 1

Assisted Solution

by:MedinaExpert
MedinaExpert earned 200 total points
ID: 33529093
ls -tr System.out* | tail -1
or
ls -t System.out* | head -1

will show the newest file
0
 

Author Comment

by:cofactor
ID: 33529443
ok . I have little doubt still
>>>ls -t System.out* | head -1
Here is my understanding

ls -t  System.out*  =  list files that started with  'System.out'  sorted by last modification time.
Now, head -1  = show  first file from the beginning  of the list of files.
and "|"  is the connector  which  sends  the file list  to on which head works
0
 
LVL 84

Expert Comment

by:ozo
ID: 33529548
that's correct
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Why Shell Scripting? Shell scripting is a powerful method of accessing UNIX systems and it is very flexible. Shell scripts are required when we want to execute a sequence of commands in Unix flavored operating systems. “Shell” is the command line i…
1. Introduction As many people are interested in Linux but not as many are interested or knowledgeable (enough) to install Linux on their system, here is a safe way to try out Linux on your existing (Windows) system. The idea is that you insta…
How to Install VMware Tools in Red Hat Enterprise Linux 6.4 (RHEL 6.4) Step-by-Step Tutorial
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
Suggested Courses
Course of the Month14 days, 8 hours left to enroll

771 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