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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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ping6

PING6(1)							   User Commands							  PING6(1)

NAME

       ping6 - Packets to network hosts

SYNOPSIS

       ping6 [OPTION...] HOST ...

DESCRIPTION

       Send ICMP ECHO_REQUEST packets to network hosts.

	      Options valid for all request types:

       -c, --count=NUMBER
	      stop after sending NUMBER packets

       -d, --debug
	      set the SO_DEBUG option

       -i, --interval=NUMBER
	      wait NUMBER seconds between sending each packet

       -n, --numeric
	      do not resolve host addresses

       -r, --ignore-routing
	      send directly to a host on an attached network

       -w, --timeout=N
	      stop after N seconds

	      Options valid for --echo requests:

       -f, --flood
	      flood ping (root only)

       -l, --preload=NUMBER
	      send NUMBER packets as fast as possible before falling into normal mode of behavior (root only)

       -p, --pattern=PATTERN
	      fill ICMP packet with given pattern (hex)

       -q, --quiet
	      quiet output

       -s, --size=NUMBER
	      send NUMBER data octets

       -?, --help
	      give this help list

       --usage
	      give a short usage message

       -V, --version
	      print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

       Options marked with (root only) are available only to superuser.

AUTHOR

       Written by Jeroen Dekkers.

REPORTING BUGS

       Report bugs to <bug-inetutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The  full  documentation  for ping6 is maintained as a Texinfo manual.  If the info and ping6 programs are properly installed at your site,
       the command

	      info ping6

       should give you access to the complete manual.

GNU inetutils 1.9						   December 2011							  PING6(1)
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