AutoHotkey Community

Gui, Add, Text, x12 y10 w330 h30 , Locate the text you wish to delete.
Gui, Add, Edit, x12 y40 w330 h20 vtext,
Gui, Add, Button, x12 y70 w100 h30 , Cancel
Gui, Add, Button, x122 y70 w100 h30 , Back
Gui, Add, Button, x232 y70 w100 h30 , Next
Gui, Add, Button, x122 y120 w100 h30 , Submit
GuiControl, Disable, Edit1
Gui, Show, w358 h166, Some Title
Return

ButtonCancel:
GuiClose:
ExitApp

ButtonBack:
Gui, Submit, NoHide
MsgBox, Back button
Return

ButtonNext:
Gui, Submit, NoHide
FileReadLine, var, file.txt, 6
ControlSetText, Edit1, %var%
Return

ButtonSubmit:
Gui, Submit, NoHide
MsgBox, SumbitButton
Return

("2+3", 150) ; start with line 2, increment 3 upto line 150 so 2,5,8,11,14 etc

("6+6", 150) ; What happens if there isn't 150 lines and there's no way of telling how many lines there are?

Lines:=TF_Readlines("text.txt", "6+6")
MsgBox % Lines

ButtonNext:
Gui, Submit, NoHide
#Include tf.ahk
var:=TF_ReadLines("file.txt", "6+6")
ControlSetText, Edit1, %var%
Return

ButtonSubmit:
Gui, Submit, NoHide
#Include tf.ahk
TF_RemoveLines(var, 6, 7)
Return

; http://www.autohotkey.com/forum/viewtopic.php?p=340861#340861
; #include tf.ahk ; only once no need to do it for each button

Gui, Add, Text, x12 y10 w330 h30 , Locate the text you wish to delete.
Gui, Add, Edit, x12 y40 w330 h260 vtext,
Gui, Add, Button, x12  y310 w100 h30 , Cancel
Gui, Add, Button, x122 y310 w100 h30 , Back
Gui, Add, Button, x232 y310 w100 h30 , Next
Gui, Add, Button, x122 y345 w100 h30 , Submit
GuiControl, Disable, Edit1
Gui, Show, w358 h380, Some Title
Return

ButtonBack:
Gui, Submit, NoHide
MsgBox, Back button
Return

ButtonNext:
Gui, Submit, NoHide
var:=TF_ReadLines("text.txt", "6+6") ; this will read lines 6 12 18 etc into a variable
StringReplace, var, var, `n, `r`n, all ; to fix view for edit control as it expects `r`n to separate each line rather than a single `n
ControlSetText, Edit1, %var%
Return

ButtonSubmit:
Gui, Submit, NoHide
MsgBox, 4,Are you sure, This will remove line 6 from Text.txt and overwrite the original file
IfMsgBox Yes
   TF_RemoveLines("!text.txt", 6, 6) ; this will operate on the file not the variable
Return

Esc::
ButtonCancel:
GuiClose:
ExitApp

; http://www.autohotkey.com/forum/viewtopic.php?p=340861#340861
; #include tf.ahk ; only once

Line=0
counter=0

Gui, Add, Text, x12 y10 w330 h30 , Locate the text you wish to delete.
Gui, Add, Edit, x12 y40 w330 h260 vtext,
Gui, Add, Button, x12  y310 w100 h30 , Cancel
Gui, Add, Button, x122 y310 w100 h30 , Back
Gui, Add, Button, x232 y310 w100 h30 , Next
Gui, Add, Button, x122 y345 w100 h30 , Submit
GuiControl, Disable, Edit1
Gui, Show, w358 h380, Some Title
Return

ButtonBack:
Gui, Submit, NoHide
MsgBox, Back button
Return

ButtonNext:
Gui, Submit, NoHide
line += 6
var:=TF_ReadLines("text.txt", line, line, 1) ; read only one line, do not add new line
StringReplace, var, var, `n, `r`n, all ; to fix view for edit control
ControlSetText, Edit1, %var%
Return

ButtonSubmit:
Gui, Submit, NoHide
MsgBox, 4,Are you sure?, This will remove line number %line% from Text.txt and overwrite the original file
IfMsgBox Yes
   TF_RemoveLines("!text.txt", line, line)
; note line 12 has become 11 now that 6 is removed so may wish to keep track of that as well by using an extra variable for how many lines you have deleted like so:
Counter++
Line -= Counter ; make sure it is line 12 from the orginal order
Gosub ButtonNext ; update view
Return

Esc::
ButtonCancel:
GuiClose:
ExitApp

FileReadLine, 6, file.txt, 6
FileReadLine, 10, file.txt, 10
FileReadLine, 14, file.txt, 14
FileReadLine, 18, file.txt, 18
FileReadLine, 22, file.txt, 22

Gui, Add, Radio, x32 y40 w190 h20 vvar6 %6%
Gui, Add, Radio, x32 y60 w190 h20 vvar10, %10%
Gui, Add, Radio, x32 y80 w190 h20 vvar14, %14%
Gui, Add, Radio, x32 y100 w190 h20 vvar18, %18%
Gui, Add, Radio, x32 y120 w190 h20 vvar22, %22%
Gui, Add, Button, x72 y150 w100 h30 , Delete
Gui, Show, w249 h205, Title
Return

GuiClose:
ExitApp

ButtonDelete:
Gui, Submit, NoHide
if var6 = 1
{
   msgbox, delete line %6%?
}
if var10 = 1
{
   msgbox, delete line %10%?
}
if var14 = 1
{
   msgbox, delete line %14%?
}
Return

; www.autohotkey.com/forum/viewtopic.php?p=340861#340861
; #include tf.ahk ; only once

ToRead=2,4,8,9 ; comma separated list of lines you want to view and possibly delete
StringSplit, ToReadIndex, ToRead, `, ; need this in listview as well
Lines:=TF_Readlines("text.txt", ToRead, "", 1) ; read lines
Gui, add, listview , w490 h200 Checked, #|Text
Loop, parse, lines, `n, `r
    LV_Add("", ToReadIndex%A_Index%, A_Loopfield) ; fill listview with checbox, orginal line number + text of line
Gui, add, button, , submit   
Gui, show, w510 h250, ViewLines
Return

ButtonSubmit:
Delete= ; see LV_GetNext documentation for more info
RowNumber = 0  ; This causes the first loop iteration to start the search at the top of the list.
Loop
{
    RowNumber := LV_GetNext(RowNumber, "Checked")  ; Resume the search at the row after that found by the previous iteration.
    if not RowNumber  ; The above returned zero, so there are no more selected rows.
        break
   LV_GetText(Text, RowNumber)
    Delete .= Text ","   ; build list of lines to delete e.g. checked lines
}
StringTrimRight, Delete, Delete, 1 ; remove trailing ,
MsgBox, 4, Are you sure?, This will remove lines %Delete% from Text.txt and overwrite the original file
IfMsgBox Yes
   TF_RemoveLines("!text.txt", Delete) ; delete selected lins
Return

Esc::ExitApp