Sponsored Content
Top Forums Shell Programming and Scripting Setting rate of execution using while Post 302639713 by jim mcnamara on Saturday 12th of May 2012 11:23:29 PM
Old 05-13-2012
I do not see what tail gives you. But. Try this.
Code:
dt=`date`
cnt=0;
while [ $cnt -lt 1000 ]
do
   echo $dt
   cnt=$(( $cnt + 1  ))
done > dtfile

>outputfile
while :
do
  cat dtfile 
  sleep 1
done > outputfile &
sleep 1
tail -f outputfile

You may want to learn about the sync command, and how new data is written to disk periodically, not continuously.
Since the kernel keeps all of the data being written to outfile, tail -f will see it all (except the first 990 lines of outfile)
This User Gave Thanks to jim mcnamara For This Post:
 

8 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

rate of process

How can I determine if the data collection rate is 1 Hz on Solaris? (0 Replies)
Discussion started by: laila63
0 Replies

2. Programming

POSIX method for setting arbitrary (nonstandard) baud rate?

I have a USB serial adapter that supports arbitrary baud rates. To set a nonstandard rate in code, I'd been using the TIOCGSERIAL like so: struct serial_struct ser_info; ioctl(ser_dev, TIOCGSERIAL, &ser_info); ser_info.flags = ASYNC_SPD_CUST | ASYNC_LOW_LATENCY; ser_info.custom_divisor... (1 Reply)
Discussion started by: cmb
1 Replies

3. Shell Programming and Scripting

Expect Issue Serial Forground Execution vs Concurrent Background Execution

I have an expect script that interrogates several hundred unix servers for both access and directories therein using "ssh user@host ls -l /path". The combination of host/path are unique but the host may be interrogated multiple times if there are multiple paths to test. The expect script is run... (2 Replies)
Discussion started by: twk
2 Replies

4. AIX

Paging Rate

Hi Friends, Can you please answer the following questions. 1) What is Paging rate ? 2) How to Calculate Paging rate from the following topas command output? Faults 206 Real,MB 28671 Steals 311 % Comp 71.1 PgspIn 1 % Noncomp 28.8 ... (3 Replies)
Discussion started by: deshaipet
3 Replies

5. UNIX for Dummies Questions & Answers

Transfer Rate Disk

hi guys I have a linux server which has about 5 volumes from SAN (fiber channel) now I need to measure the transfer rate between one LUN which is a Logical Volume to another LUN which is another Logical Volume. so basically this server has 5 LUNs from SAN each SAN volume is a logical volume... (3 Replies)
Discussion started by: karlochacon
3 Replies

6. Shell Programming and Scripting

Need help in controling execution rate of script in shell

I want to control the speed of execution of a script, There are 1000 lines in script, i want 100 lines to be executed in 10 seconds and from 11th second execution from 101 line should start, again so on. Please help me in creating the script. Thanks, cmaniar (1 Reply)
Discussion started by: cmaniar
1 Replies

7. AIX

Scan Rate

Hello, How can i tell ifthe ratio between fr and sr is ok? is fr/sr ratio of 0.9 acceptable? thanks. (1 Reply)
Discussion started by: LiorAmitai
1 Replies

8. Shell Programming and Scripting

How can I get the increased rate in MB?

Deal all, I have a directory called I want to know how many MBs are transferred to it every 2 hours. How can I do this? Any ideas? I have a simple idea but I can't translate it into shell script, the idea is: 1- get the size of the folder now, using 2- then get the size of the... (4 Replies)
Discussion started by: Mohannad
4 Replies
MTAIL(1)							   User Commands							  MTAIL(1)

NAME
mtail - tail variant designed for web developers monitoring logfiles SYNOPSIS
mtail [options] <file>... DESCRIPTION
MonkeyTail allows a user to tail multiple files on both local and remote hosts and clearly marks inactivity by putting 5 newlines in the output whenever a pause in output over 3 seconds is detected. MonkeyTail is implemented a fairly simple wrapper script around standard tail, ssh, and sudo. OPTIONS
-q Quiet mode --quiet " " -n Output the last N lines of each file before tailing (defaults to 0) <file>... Files to tail. These can specified in the following ways: @<groupname> - expands the group (from .mtailrc) to a list of files to tail <filename> - tails a local file. +<filename> - attempts to sudo and tail a local file (will prompt for pwd if required). <remotehost>:<filename> - attempts to invoke tail via ssh on a remote host. +<remotehost>:<filename> - attempts to invoke sudo tail via ssh on a remote host (will prompt for pwd if required). SEE ALSO
mtailrc(5), tail(1) AUTHOR
Martyn Smith <martyn@dollyfish.net.nz> mtail May 2008 MTAIL(1)
All times are GMT -4. The time now is 03:25 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy