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Full Discussion: Help with IF statement with loop Shell Script
Top Forums Shell Programming and Scripting Help with IF statement with loop Shell Script Post 302456723 by zero3ree on Saturday 25th of September 2010 12:47:37 PM
Old 09-25-2010
Help with IF statement with loop Shell Script
Hello I am very new to shell and I bought some books and trying to learn it. I started trying to write a script that will take a number and count it down to 1 with commas in between. This number can only be one argument. If lower than one or higher than one argument it sends an error message.

Here is an example of the output:

input: countdown.sh 8
output: 8,7,6,5,4,3,2,1

input: countdown.sh 8 2
output: error: program must be executed with one argument.

Here is what I have so far. I am stuck because I am not sure how you differentiate between arguments and values.
Any help would be appreciated.

Code:
  #!/bin/ksh
  ###############
  # Script name: countdown.sh
  # Case #1: ./countdown.sh  <integer>
  ###########
  # Assign the first command line argument to the variable NUMBER.
  NUMBER=$1
  # One argument must be provided, otherwise don't execute
  if [$NUMBER > 1]
  then
              echo “error: program must be executed with 1 argument.”
                  exit .....
  elif [ $NUMBER=1]
  while [ $NUMBER -gt 0 ]
  do
     printf .......
     if [$NUMBER -gt 1 ]
     then
       printf ", "
     fi
   NUMBER=$(($NUMBER - 1))
  done
  printf

 

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LEARN ABOUT DEBIAN

ptpd

ptpd(8) 						  Precision Time Protocol daemon						   ptpd(8)

NAME

       ptpd - Precision Time Protocol daemon (1588-2008)

SYNOPSIS

       ptpd [?]  [-c] [-S] [-f FILE] [-R FILE] [-d] [-D] [-x] [-M NUMBER] [-t] [-T ttl] [-a NUMBER,NUMBER] [-w NUMBER] [-b NAME] [-u ADDRESS] [-e]
       [-h] [-l NUMBER,NUMBER] [-o NUMBER] [-i NUMBER] [-n NUMBER] [-y NUMBER] [-m NUMBER] [-g] [-v NUMBER] [-r NUMBER] [-s  NUMBER]  [-p  NUMBER]
       [-q NUMBER]

DESCRIPTION

       Implements the Precision Time Protocol (PTP) Version 2 as defined by the IEEE 1588-2008 standard. PTP was developed to provide very precise
       time coordination of LAN connected computers.

       PTPd is a complete implementation of the IEEE 1588 v2 specification for a standard (ordinary) clock. PTPd has been tested with and is known
       to  work  properly  with other IEEE 1588 implementations. The source code for PTPd is freely available under a BSD-style license. Thanks to
       contributions from users, PTPd is becoming an increasingly portable, interoperable, and stable IEEE 1588 implementation.

       For more information, see http://ptpd.sourceforge.net/

OPTIONS

       -?     display a short help text

       -c     run in command line (non-daemon) mode

       -S     log information to syslog

       -f FILE
	      send output to FILE

       -R FILE
	      record a quality FILE

       -d     display stats

       -D     display stats in .csv format

       -x     do not reset the clock if off by more than one second

       -M NUMBER
	      do not reset the clock if off by more than NUMBER nanoseconds

       -t     do not adjust the system clock

       -T     set multicast TTL for packets.  Defaults to 1.

       -a NUMBER,NUMBER
	      specify clock servo P and I attenuations

       -w NUMBER
	      specify one way delay filter stiffness

       -b NAME
	      bind PTP to network interface NAME

       -u ADDRESS
	      also send uni-cast to ADDRESS

       -e     run in ethernet mode (level2)

       -h     run in End to End mode

       -l NUMBER,NUMBER
	      specify inbound, outbound latency in nsec

       -o NUMBER
	      specify current UTC offset

       -i NUMBER
	      specify PTP domain number

       -n NUMBER
	      specify announce interval in 2^NUMBER sec

       -y NUMBER
	      specify sync interval in 2^NUMBER sec

       -m NUMBER
	      specify max number of foreign master records

       -g     run as slave only

       -v NUMBER
	      specify system clock allen variance

       -r NUMBER
	      specify system clock accuracy

       -s NUMBER
	      specify system clock class

       -p NUMBER
	      specify priority1 attribute

       -q NUMBER
	      specify priority2 attribute

AUTHOR

       Gael Mace <gael_mace@users.sourceforge.net> & Alexandre Van Kempen.

       Steven Kreuzer <skreuzer@freebsd.org>

       George Neville-Neil <gnn@freebsd.org>

       This manual page was written by Gael Mace for any Linux environment project.

version 2.1.0							   October, 2010							   ptpd(8)
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