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Full Discussion: getopts problem
Top Forums UNIX for Advanced & Expert Users getopts problem Post 302257408 by bakunin on Wednesday 12th of November 2008 04:53:28 AM
Old 11-12-2008
Quote:
Originally Posted by mobydick
----according to yoy the envirinment [$1..$2..] will change if i call from the same shell but here it is printing the same values.
The point is not that it has to change, but it might change. You simply cannot rely on the fact that "$1" remains the same before and after getopts - whereas you can rely on, say, "$charley" being the same before and after executing a command.

The meaning of the set-command is simple: "set --" clears the special variables "$1", "$2", etc.:

Code:
# cat settest.sh
#!/bin/ksh

echo "first parm is: $1"
echo "second parm is: $2"
echo "third parm is: $3"

set --

echo "first parm is: $1"
echo "second parm is: $2"
echo "third parm is: $3"
exit 0

# ./settest.sh a b c
first parm is: a
second parm is: b
third parm is: c
first parm is:
second parm is:
third parm is:

Therefore the "set -- -2-------" means: first make sure no other commandline parameter is set, regardless of what you enter on the commandline, then set exactly one parameter ("-2") with some argument ("------").

I hope this helps.

bakunin
 

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LEARN ABOUT REDHAT

modinfo

MODINFO(8)						       Linux Module Support							MODINFO(8)

NAME

       modinfo - display information about a kernel module

SYNOPSIS

       modinfo [ options ] <module_file>

DESCRIPTION

       The modinfo utility examines the object file module_file associated with a kernel module and displays any information that it can glean.

   OPTIONS
       -a, --author
	      Display the module's author.

       -d, --description
	      Display the module's description.

       -fformat_string, --format format_string
	      Let the user specify an arbitrary format string which can extract values from the ELF section in module_file which contains the mod-
	      ule information.	Replacements consist of a percent sign followed by a tag name in curly braces.	A tagname of %{filename} is always
	      supported,  even	if  the  module has no modinfo section.  %{kernel_version} shows the version of the kernel the module was compiled
	      for.  %{using_checksums} expands to 1 is the module has versioned symbols and to 0 or <none> otherwise.

	      A tagname of %{parm} is special: the format string line is repeated for each known module parameter (which may be  zero  times)  and
	      %{parm} is then replaced by descriptions of module parameters (one parameter on each repeated line).

	      Alternatively,  %a, %d, %l, %n and %p can be used instead of %{author}, %{description}, %{filename}, %{license} and %{parm}, respec-
	      tively.

       -h, --help
	      Display a summary of options and immediately exit.

       -l, --license
	      Display the module's license.

       -n, --filename
	      Display the module's filename.

       -p, --parameters
	      Display the typed parameters that a module may support.

       -V, --version
	      Display the version of modinfo.

       If no options are supplied, the default is filename, description, author, license and parameters.

SEE ALSO

       insmod(8), modprobe(8), depmod(8), rmmod(8), lsmod(8), ksyms(8), modules(2)

Linux								  March 19, 2002							MODINFO(8)
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