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Top Forums Shell Programming and Scripting question about about Shell programming Post 302180928 by thungmail on Tuesday 1st of April 2008 01:27:37 PM
Old 04-01-2008
question about about Shell programming

Code:
1.if [ "$1" ]
2.then
3.        # save the number of args and first argument in variables.
4.        num_args=$#
5.        id="$1"
6.        echo "$id"
7.        #echo "$1" > crapfile.txt
8.        echo `sed 's/\*/'\*'/g' < crapfile.txt`

Above is a partial code.I would like to ask:
at line 1: what is $1 how it works
at line 4: what is $#
at line 8: what does it try to do.
I am new to shell programming. Can anyone out there explain it to me. Thanks
 

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XtCreatePopupShell(3Xt) 					   XT FUNCTIONS 					   XtCreatePopupShell(3Xt)

NAME
XtCreatePopupShell, XtVaCreatePopupShell - create a popup shell SYNTAX
Widget XtCreatePopupShell(String name, WidgetClass widget_class, Widget parent, ArgList args, Cardinal num_args); Widget XtVaCreatePopupShell(String name, WidgetClass widget_class, Widget parent, ...); ARGUMENTS
args Specifies the argument list to override the resource defaults. name Specifies the text name for the created shell widget. num_args Specifies the number of arguments in the argument list. parent Specifies the parent widget. widget_class Specifies the widget class pointer for the created shell widget. ... Specifies the variable argument list to override the resource defaults. DESCRIPTION
The XtCreatePopupShell function ensures that the specified class is a subclass of Shell and, rather than using insert_child to attach the widget to the parent's children list, attaches the shell to the parent's pop-ups list directly. A spring-loaded pop-up invoked from a translation table already must exist at the time that the translation is invoked, so the translation manager can find the shell by name. Pop-ups invoked in other ways can be created ``on-the-fly'' when the pop-up actually is needed. This delayed creation of the shell is particularly useful when you pop up an unspecified number of pop-ups. You can look to see if an appropri- ate unused shell (that is, not currently popped up) exists and create a new shell if needed. SEE ALSO
XtCreateWidget(3Xt), XtPopdown(3Xt), XtPopup(3Xt) X Toolkit Intrinsics - C Language Interface Xlib - C Language X Interface XFree86 Version 4.7.0 XtCreatePopupShell(3Xt)
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