[Webinar] Streamline your web hosting managementRegister Today

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 266
  • Last Modified:

unix command needed

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
cofactor
Asked:
cofactor
2 Solutions
 
MedinaExpertCommented:
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
 
MedinaExpertCommented:
This is actually better, sorry

tail -100f `ls -latr System.out* | tr ' ' '\n' | tail -1`
0
 
cofactorAuthor Commented:
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
Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
MedinaExpertCommented:
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
 
TintinCommented:
No need to over complicate it.  Just do

ls -t System.out* | tail -1

0
 
MedinaExpertCommented:
true, but make it ls -t | head -1 or ls -tr | tail -1 to get the newest.
0
 
cofactorAuthor Commented:
>>>No need to over complicate it.  Just do
ls -t System.out* | tail -1

does it  show the latest ?
0
 
MedinaExpertCommented:
ls -tr System.out* | tail -1
or
ls -t System.out* | head -1

will show the newest file
0
 
cofactorAuthor Commented:
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
 
ozoCommented:
that's correct
0

Featured Post

Get your problem seen by more experts

Be seen. Boost your question’s priority for more expert views and faster solutions

Tackle projects and never again get stuck behind a technical roadblock.
Join Now