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Top Forums UNIX for Dummies Questions & Answers Reading specific part of file Post 76712 by guptan on Thursday 30th of June 2005 04:55:11 AM
Old 06-30-2005
Reading specific part of file

I have a requirement to go to particular line in the file and from there read the contents till it meets a particular criteria. For eg if the contents of the file is like

81 abcd ------------------- Line 1
82 cdfe ------------------- Line 2
83 dfj ------------------- Line 3
84 df ------------------- Line 4
81 dkfh ------------------- Line 5
82 df ------------------- Line 6
83 dlf ------------------- Line 7
84 dif ------------------- Line 8
81 sdfh ------------------- Line 9
82 dfjh ------------------- Line 10
83 kdf ------------------- Line 11
84 dfj ------------------- Line 12

What the program should do is go to line number 5 directly and from there read the contents of the file till it finds the line starting with 81 again.

TIA
Narayana Gupta
 

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ipentry(3tk)						    An IP address entry widget						      ipentry(3tk)

__________________________________________________________________________________________________________________________________________________

NAME
ipentry - An IP address entry widget SYNOPSIS
package require Tcl 8.4 package require Tk 8.4 package require ipentry ?0.3? ::ipentry::ipentry pathName ?option value...? ::ipentry::ipentry6 pathName ?option value...? pathName complete pathName get pathName insert iplist pathName icursor index pathName configure option value... pathName cget option _________________________________________________________________ DESCRIPTION
This package provides a widget for the entering of a IP address. ::ipentry::ipentry pathName ?option value...? Creates a new IPv4 ipentry widget and configures it with the given options and their values. ::ipentry::ipentry6 pathName ?option value...? Creates a new ipentry widget for the entry of an IPv6 address. All options are the same as the IPv4 widget. Each widget created with the command above supports the following methods: pathName complete Returns a boolean value. True indicates that the entry contains a complete IP address, meaning all fields have a value. In some cases IPv6 address are valid when fields are missing. You will need to do your own validation to detect this. pathName get Returns the contents of the entry as a list consisting of 4 or 8 elements. pathName insert iplist IPv4 Takes a list of 4 elements and inserts one into each quad of the entry, in order. All values in the list must be empty or integers. Values outside the range 0 to 255 are modified to be within the range. IPv6 Takes a list of 8 elements and inserts one into each quad of the entry, in order. All values in the list must be empty or 1 to 4 hex digits. pathName icursor index Sets the position of the widgets insertion cursor. Only integer values between 0 and 15 are valid for ipentry and 0 to 31 for ipen- try6. Setting the icursor will only have an effect if the widget already has the input focus. pathName configure option value... Modifies the configuration of the widget. For options and their meaning see the widget options section. pathName cget option Returns information about the current configuration of the widget, for the specified option. For options and their meaning see the widget options section. WIDGET OPTIONS
Command-Line Switch: -textvariable Database Name: textvariable Database Class: Variable The name of a variable which holds the value of the IP address. The value must be a string of the form NNN.NNN.NNN.NNN for IPv4 or HHHH:HHHH:HHHH:HHHH:HHHH:HHHH:HHHH:HHHH for IPv6 where H is a hex digit. The variable will be modified to represent a valid IP address if it is not already. Command-Line Switch: -state Database Name: state Database Class: State Specifies one of three states for the entry: normal, disabled, or readonly. Command-Line Switch: -font Database Name: font Database Class: Font Command-Line Switch: -bd Database Name: borderWidth Database Class: BorderWidth Command-Line Switch: -fg Database Name: foreground Database Class: Foreground Command-Line Switch: -bg Database Name: background Database Class: Background Command-Line Switch: -relief Database Name: relief Database Class: Relief Command-Line Switch: -highlightthickness Database Name: highlightThickness Database Class: HighlightThickness Command-Line Switch: -highlightcolor Database Name: highlightColor Database Class: HighlightColor Command-Line Switch: -highlightbackground Database Name: highlightBackground Database Class: HighlightBackground Command-Line Switch: -selectbackground Database Name: selectBackground Database Class: Background Command-Line Switch: -selectforeground Database Name: selectForeground Database Class: Foreground Command-Line Switch: -selectborderwidth Database Name: selectBorderWidth Database Class: BorderWidth Command-Line Switch: -disabledbackground Database Name: disabledBackground Database Class: DisabledBackground Command-Line Switch: -disabledforeground Database Name: disabledForeground Database Class: DisabledForeground Command-Line Switch: -readonlybackground Database Name: readonlyBackground Database Class: ReadonlyBackground Command-Line Switch: -insertbackground Database Name: insertBackground Database Class: Background Standard widget options. See options for a description of their meanings and values. KEYWORDS
entry, ip address ipentry 0.3 ipentry(3tk)
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