Sponsored Content
Top Forums Shell Programming and Scripting How to tail -f real time file. Post 302566226 by ddreggors on Wednesday 19th of October 2011 11:46:03 PM
Old 10-20-2011
Quote:
Originally Posted by madanlee
This might help you:

Code:
ls -ltr|head -1|awk '{print $9}'|tail -f

I am not sure why you would add the "-l" (long listing) which makes you use awk to remove the columns given with a long listing. You could remove the "-r" (reverse order) and "-l" (long listing) flags and use the "-w1" or "-1" (force 1 column width/1 file per line) for a better method would be:

Code:
ls -tw1|head -1|tail -f

or

Code:
ls -t1|head -1|tail -f


With an "ls" based command string you would have the added risk of finding directories as well as files. If someone were to create a directory after the last logfile was created and then that script/command ran you would get unexpected results.

Last edited by ddreggors; 10-20-2011 at 12:58 AM.. Reason: Additional Thoughts...
 

8 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Real time log file redirect

Hi all, i would like to write the shell script program, it can monitor the access_log "real time" when the access_log writing the line contain "abcdef" the program will be "COPY" this line into a file named "abcdef.txt", do the same thing if the contain "123456" "COPY" it into a file named... (3 Replies)
Discussion started by: eric_wong_ch
3 Replies

2. UNIX for Dummies Questions & Answers

Live/real-time text-file updates in terminal

I want to have a terminal open and have something like a "repeating cat" command running in it for a certain text file (in particular /var/log/system.log). So my terminal will scan or cat the text file every so often or whenever the text file system.log gets written to by the system, it will... (1 Reply)
Discussion started by: guitarscn
1 Replies

3. Shell Programming and Scripting

Shell script to convert epoch time to real time

Dear experts, I have an epoch time input file such as : - 1302451209564 1302483698948 1302485231072 1302490805383 1302519244700 1302492787481 1302505299145 1302506557022 1302532112140 1302501033105 1302511536485 1302512669550 I need the epoch time above to be converted into real... (4 Replies)
Discussion started by: aismann
4 Replies

4. Shell Programming and Scripting

How to tail real time file Generated every hour?

Hi Guys, I am developing a script to monitor log file Generated every hour. When creating a new file scripts not working. My Code . I want to monitor GatewayTransaction.yyyymmdd-hh.log while true; do newdate=$(date '+%Y%m%d') ; nowdate=$(date '+%Y%m%d-%H.log'); tail -f... (7 Replies)
Discussion started by: ooilinlove
7 Replies

5. Shell Programming and Scripting

Copy real file from a shortcut preserving the time stamps and directory tree

I have directory with shorcuts of files. for example: gara@yn\short\name1 ( shortcut to gara@yn\FOLDER\OPT\GARA\1.jpg ) gara@yn\short\name2 ( shortcut to gara@yn\FOLDER\OPT\GARA\11.jpg ) gara@yn\short\name3 ( shortcut to gara@yn\MARA\URSA\2.jpg ) gara@yn\short\name4 ( shortcut to... (6 Replies)
Discussion started by: gogok_bg
6 Replies

6. Shell Programming and Scripting

How do i use tail & grep in real time here??

Hi I have a file which is updated very frequently. Where in i wanted to use tail -f command in the script and wanted to grep for a particular word. But the issue is when i use tail -f filename|grep "word" ... it will show me blank until the word is found in the real time. if it shows... (13 Replies)
Discussion started by: nikhil jain
13 Replies

7. Shell Programming and Scripting

Archiving or removing few data from log file in real time

Hi, I have a log file that gets updated every second. Currently the size has grown to 20+ GB. I need to have a command/script, that will try to get the actual size of the file and will remove 50% of the data that are in the log file. I don't mind removing the data as the size has grown to huge... (8 Replies)
Discussion started by: Souvik Patra
8 Replies

8. UNIX for Advanced & Expert Users

How to read a fast written log file at Real time speed?

Hello All, I am building a real time parser for a log file in my application. The log file is continuously written at a very fast pace and gets rolled over every 10 minutes. I have measured the speed and observed that around 1000 lines are written to it every second, each line about 30-40... (7 Replies)
Discussion started by: cool.aquarian
7 Replies
MAKE(1) 						      General Commands Manual							   MAKE(1)

NAME
make - a program for maintaining large programs SYNOPSIS
make [-f file] [-iknpqrst] [option] ... [target] OPTIONS
-f Use file as the makefile -i Ignore status returned by commands -k On error, skip to next command -n Report, but do not execute -p Print macros and targets -q Question up-to-dateness of target -r Rule inhibit; do not use default rules -s Silent mode -t Touch files instead of making them EXAMPLES
make kernel # Make kernel up to date make -n -f mfile # Tell what needs to be done DESCRIPTION
Make is a program that is normally used for developing large programs consisting of multiple files. It keeps track of which object files depend on which source and header files. When called, it does the minimum amount of recompilation to bring the target file up to date. The file dependencies are expected in makefile or Makefile , unless another file is specified with -f. Make has some default rules built in, for example, it knows how to make .s files from .c files. Here is a sample makefile . d=/user/ast # d is a macro program: head.s tail.s# program depends on these cc -o program head.s tail.s# tells how to make program echo Program done. # announce completion head.s: $d/def.h head.c # head.s depends on these tail.s: $d/var.h tail.c # tail.s depends on these A complete description of make would require too much space here. Many books on UNIX discuss make . Study the numerous Makefiles in the MINIX source tree for examples. SEE ALSO
cc(1). MAKE(1)
All times are GMT -4. The time now is 09:38 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy