LinuxQuestions.org - remove the line

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- - remove the line (https://www.linuxquestions.org/questions/programming-9/remove-the-line-584357/)

munna_dude

09-13-2007 04:03 AM

remove the line

hi all
how to remove the line
first we have to search the line
if the line exist remove the line
else
dont do anything.

for example "disable_from_plugins" , this is the word containing the line
search the line and delete.. programatically

can you please help me

thank you in advance

Mega Man X

09-13-2007 04:40 AM

Something like this would do. You didn't mention which language you are using, so I will give you the solution in a random language. I'm sure it will help you:

Code:

Public Function DeleteLine(fName As String, LineNumber As Long) _

    As Boolean

'Purpose: Deletes a Line from a text file



'Parameters: fName = FullPath to File

'            LineNumber = LineToDelete



'Returns:    True if Successful, false otherwise



'Requires:  Reference to Microsoft Scripting Runtime



'Example: DeleteLine("C:\Myfile.txt", 3)

'          Deletes third line of Myfile.txt

'______________________________________________________________

                      



  Dim oFSO As New FileSystemObject

  Dim oFSTR As Scripting.TextStream

  Dim ret As Long

  Dim lCtr As Long

  Dim sTemp As String, sLine As String

  Dim bLineFound As Boolean

  

  On Error GoTo ErrorHandler

  If oFSO.FileExists(fName) Then

    Set oFSTR = oFSO.OpenTextFile(fName)

    lCtr = 1

    Do While Not oFSTR.AtEndOfStream

        sLine = oFSTR.ReadLine

        If lCtr <> LineNumber Then

            sTemp = sTemp & sLine & vbCrLf

        Else

            bLineFound = True

            

        End If

        lCtr = lCtr + 1

    Loop

  

    oFSTR.Close

    Set oFSTR = oFSO.CreateTextFile(fName, True)

    oFSTR.Write sTemp

  

    DeleteLine = bLineFound

  End If

  



ErrorHandler:

On Error Resume Next

oFSTR.Close

Set oFSTR = Nothing

Set oFSO = Nothing



End Function

munna_dude

09-13-2007 04:42 AM

hi i tried up to this

Code:

cat munna.c | grep disable_from_plugins

the output is

Quote:

g_ref(disable_from_plugins);

then hoe to remove the line that containing "disable_from_plugins".
and save the file..

and
if the word not find....
dont do any thing..

i prefer c or script.

please help me

thank you in advance

/bin/bash

09-13-2007 05:47 AM

sed -i '/disable_from_plugins/d' munna.c

munna_dude

10-03-2007 04:24 AM

Quote:

Originally Posted by /bin/bash (Post 2890514)

sed -i '/disable_from_plugins/d' munna.c

hi
i have another problem with this
i would not like to remove the line.
just wanna do some changes in the line..

for example "disable_from_plugins" , this is the word containing the line
search the line and change the line i.e
rame("rr.disable_from_plugins", 2);
to
"rame("rr.disable_from_plugins", 1);"
and save by programatically

can you please help me

thank you in advance

Nimoy

10-03-2007 05:03 AM

simple SED script

This simple script takes the string "Copyright 1999-2005 - All rights reserved" from all the html files in the directory where it is run and replaces it with "Copyright 1999-2007 - All rights reserved" and makes a backup as well... Hope it is of use.

for file in *.html
do
cp $file $file.bak &&
sed 's/Copyright 1999-2005 - All rights reserved/Copyright 1999-2007 - All rights reserved/g' $file.bak >$file
done

munna_dude

10-03-2007 05:21 AM

Quote:

Originally Posted by Nimoy (Post 2911567)

it is not helpfull..
previously i used
sed -i '/disable_from_plugins/d' munna.c

to delete the line

but i would like to change the text in that line and save in that file only..
i dont wanna use redirecting file..

can you help me
like one line command to do this operation ...

thank you in advance

Nimoy

10-03-2007 05:49 AM

sed in one line

AN IMAGINARY FILE CONTAINING: /usr/local/bin
The file name of the imaginary file is old - The one line command to change this file is:

sed 's|/usr/local/bin|/common/bin|' <old >new

If you can do it without the redirect (I assume you mean <old >new I am uncertain...

munna_dude

10-03-2007 06:09 AM

Quote:

Originally Posted by Nimoy (Post 2911600)

AN IMAGINARY FILE CONTAINING: I would like to insert something here

The file name of the imaginary file is filetochange - The one line command to change this file is:

sed 's/would like to insert/have inserted/g' filetochange

And should produce the follwing change in the file filetochange

I have inserted something here

i tried like this

Quote:

[munna@localhost munna]$ sed 's/rame("rr.disable_from_plugins", 0);/rame("rr.disable_from_plugins", 2);/g' simple.txt

rame("rr.disable_from_plugins", 2);
[munna@localhost munna]$

the output printing in the terminal, not in to the file..
i would like to save the output in that file by replacing the line..

can you help me

thank you in advance

jschiwal

10-03-2007 06:22 AM

Perhaps you should at least read "sed --help". Note the "-i" option.

pixellany

10-03-2007 07:58 AM

My all-time favorite tutorial on SED:
http://www.grymoire.com/Unix/Sed.html

Nimoy

10-03-2007 08:29 AM

Try this

sed -i 's#rame("rr.disable_from_plugins", 0);#ame("rr.disable_from_plugins", 2);#g' simple.txt

Copy the line

Go to CLI

Press CTRL+SHIFT+V

Press <Enter>

Should work...

Unless the file contains the # I used as the delimiter....

Nimoy

10-03-2007 09:56 AM

One little thing to notice

I removed the / in front of rame....

munna_dude

10-04-2007 03:23 AM

Quote:

Originally Posted by Nimoy (Post 2911822)

I removed the / in front of rame....

ok... it is working in terminal but not in the program

Code:

s10=g_strconcat("sed -i 's/rame("rr.disable_from_plugins", 2);/rame("rr.disable_from_plugins", 1)/g' ","/home/munna/Desktop/simple.txt",NULL);

i compiled this saying some error

Quote:

simple.c: In function ‘main’:
simple.c:97: error: expected ‘)’ before ‘privacy’

how can i overcome this error?

or else can you me other solution for this?
i would like to change 1 instead of 2 in that perticular line
rame("rr.disable_from_plugins", 2);

how can i do this

please help me

thank you in advance

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