Imitate head and tail command script Post: 302364782

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Implementing MORE,HEAD & TAIL

hai in my shell script i want to replace the following commands 1) more 2) head 3) tail i want to try all type of possible options avaliabul in the above commands please help in implementing those commands

2. UNIX for Dummies Questions & Answers

head & tail

I've a major file which includes other files and now I wanna 'cut' the file in several minor parts....like .... find / -name "*.tmp" >filea wc -l filea >fileb sed -e '1s/ filea//' fileb >filec AMOUNT=`cat filec` if ; then cat file a |head -100l (ell) |tail -100l >filec cat file a |head...

3. Shell Programming and Scripting

Head and Tail in One Line

I am new to UNIX......I have one file which contains thousnads of records with header and tailer. Header Record 1 Record 2 .... .... Last Record Trailer I want to concatenate Header and Trailer in the first line....now the output should look like this: Header: Header value, Trailer:...

4. Shell Programming and Scripting

Averaging in increments using awk & head/tail

Hi, I only have a very limited understanding and experience with writing code and I was hoping I could get some help. I have a dataset of two columns (txt format, numbers in each row separated by a tab) Eg. 1 5 2 5 3 6 4 7 5 6 6 6 7 ...

5. Shell Programming and Scripting

head / tail combination returns multiple rows

Hi, As part of our project, we need to load historical data for a year before our system is live. We have the data feed files that we need to load. However, I need to make sure that the file structure (number of fields separated by a comma) on the field is same for all the files of the same...

6. UNIX for Dummies Questions & Answers

head\tail how to display middle lines

hay i need to display middle line: 1 2 3 4 5 how can i display 3-4?

7. Homework & Coursework Questions

Head Tail Problem

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: view the 7th line of the program xxx.sh 2. Relevant commands, code, scripts, algorithms: head command tail...

8. UNIX for Dummies Questions & Answers

What should be precedence of using awk, sed, head and tail in UNIX?

Hi All, I am new to unix. In this forum some days back, I have read something like below: 1) Do not use perl if awk can do your work. 2) Do not use awk if sed can do your work. . . . I do not re-collect the whole thing. I think it is good to know the precedence of using these...

9. Homework & Coursework Questions

How to display certain line of file only using head or tail in 1 command?

First month learning about the Linux terminal and it has been a challenge yet fun so far. We're learning by using a gameshell. I'm trying to display a certain line ( only allowed 1 command ) from a file only using the head or tail. I'm pretty about this answer: head -23 history.txt | tail -1...

LEARN ABOUT CENTOS

keepalived

KEEPALIVED(8)						      System Manager's Manual						     KEEPALIVED(8)

NAME

       keepalived - load-balancing and high-availability service

SYNOPSIS

       keepalived [-f|--use-file=FILE] [-P|--vrrp] [-C|--check] [-l|--log-console] [-D|--log-detail] [-S|--log-facility={0-7}]
       [-V|--dont-release-vrrp] [-I|--dont-release-ipvs] [-R|--dont-respawn] [-n|--dont-fork] [-d|--dump-conf] [-p|--pid=FILE]
       [-r|--vrrp_pid=FILE] [-c|--checkers_pid=FILE] [-v|--version] [-h|--help]

DESCRIPTION

       Keepalived provides simple and robust facilities for load-balancing and high-availability. The load-balancing framework relies on
       well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 load-balancing. Keepalived implements a set of
       checkers to dynamically and adaptively maintain and manage load-balanced server pool according their health. Keepalived also implements the
       VRRPv2 protocol to achieve high-availability with director failover.

OPTIONS

	-f, --use-file=FILE
	      Use the specified configuration file. The default configuration file is "/etc/keepalived/keepalived.conf".

	-P, --vrrp
	      Only run the VRRP subsystem. This is useful for configurations that do not use IPVS load balancer.

	-C, --check
	      Only run the healthcheck subsystem. This is useful for configurations that use the IPVS load balancer with a single director with no
	      failover.

	-l, --log-console
	      Log messages to the local console. The default behavior is to log messages to syslog.

	-D, --log-detail
	      Detailed log messages.

	-S, --log-facility=[0-7]
	      Set syslog facility to LOG_LOCAL[0-7]. The default syslog facility is LOG_DAEMON.

	-V, --dont-release-vrrp
	      Don't remove VRRP VIPs and VROUTEs on daemon stop. The default behavior is to remove all VIPs and VROUTEs when keepalived exits

	-I, --dont-release-ipvs
	      Don't remove IPVS topology on daemon stop. The default behavior it to remove all entries from the IPVS virtual server table on when
	      keepalived exits.

	-R, --dont-respawn
	      Don't respawn child processes. The default behavior is to restart the VRRP and checker processes if either process exits.

	-n, --dont-fork
	      Don't fork the daemon process. This option will cause keepalived to run in the foreground.

	-d, --dump-conf
	      Dump the configuration data.

	-p, --pid=FILE
	      Use specified pidfile for parent keepalived process. The default pidfile for keepalived is "/var/run/keepalived.pid".

	-r, --vrrp_pid=FILE
	      Use specified pidfile for VRRP child process. The default pidfile for the VRRP child process is "/var/run/keepalived_vrrp.pid".

	-c, --checkers_pid=FILE
	      Use specified pidfile for checkers child process. The default pidfile for the checker child process is
	      "/var/run/keepalived_checkers.pid".

	-v, --version
	      Display the version and exit.

	-h, --help
	      Display this help message and exit.

SEE ALSO

       keepalived.conf(5), ipvsadm(8)

AUTHOR

       This man page was written by Ryan O'Hara <rohara@redhat.com>

								   November 2012						     KEEPALIVED(8)