Software :: Deleting All Instances Of A Certain Character From A Text File?

Feb 18, 2010

In my command prompt I did:

Code:

sed 's/://' mytextfile > newtextfile

But it only deleted the first instance of : in each line when some lines have multiple : appearing in each one. How can I delete all the : from the entire file?

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Programming :: Script To Remove Lines In A File With More Than "x" Instances Of Any Character ?

Oct 4, 2010

I'm looking for a script (bash, python, perl etc) or even a one liner (sed, awk etc) that can take a set of files and remove any line that has more than "x" instances of any character (case sensitive). I have been doing a lot of searching and can only come up with examples of how to remove blank lines, lines that start with a certain character or lines that contain a certain string. This will be used on a system running a Kubuntu derivative.

As a very poor and basic example, I would like to take files that contain lines like:

Code:

And end up with the files only containing the lines:

Code:

If I tell the script that 2 is the maximun number of times any character can appear in any line.

I know this must be possible, but for the life of me I cannot find even an example that will lead me in the right direction or better yet a piece of code I can use.

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Programming :: C++ Character Search In Text File?

Jun 23, 2011

Im trying to read a file in c++ and search for particular character for example if this is a list that I have:

Alice
Bob
David

[code]....

if the input is D, it should give David, if its B, gives bob. so in this case, meaning it reads the first character of every line. but if possible I want to make this dynamic so the user can specify which character position he is looking for, so in case he is looking for R as character index 3 in all lines, it should give Charlie. but the problem is, it does now recognize , besides, I do not know how to specify the character position in each line.

here is my code

Code:

#include <iostream>
#include <fstream>
#include <cstring>

[code]....

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Programming :: Sed To Change Character In Text File Only Once?

Sep 7, 2009

I have a script that looks like:

Code:

cat servers.txt
trivia:P:N
trivia:D:N
tucana:P:Y

[code]....

I want to be able to find the lines that matches my input and change the N to a Y, but only for the lines that matches the name and not any other N's My problem is the line does not always contain a P as it can be a D as well so my matching did not work. If my script issues the name $1=triva the lines will change to:

Code:

trivia:P:Y
trivia:D:Y

I have the following code so far but as you can see it does not change the D's

Code:

sed -i 's/trivia:P:Y/trivia:P:N/g' servers.txt

*** UPDATE ***

should I be using a method as follows? I am still stuck on the changing all instances though.

Code:

$1=server
sed -i 's/$server1:P:Y/$server:P:N/g' server.txt
sed -i 's/$server1:D:Y/$server:D:N/g' server.txt

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Jun 21, 2010

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Mar 1, 2010

I need to write a shell script which can compare two files(text files) character wise. eg. underscore is space.

------FILE 1---------------
A_B_C
D_E_F
G_H_I

[code].....

Actual problem: I need to write a shell script which can give me difference character by character not by line (using comm)

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Mar 30, 2010

I want to use SED to do the following: In a text file replace any occurrences of the three character string ZZZ with a quotation mark "and. replace all occurrences of a comma with a semi-colon. It is the S/ / / command which is stumping me on the first issue...inparticular how to get the replace string to be quote.

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General :: Use The Man / Info / Apropos Pages - Character Instructed The Shell To Interpret A Special Character As An Ordinary Character?

Mar 27, 2010

1.What character instructd the shell to interpret a special character as an ordinary character?

2.What directory contains some of the utilities available on the system in the form of binary files?

3. What command is used to search the location of a utility?

4. What command is used to instruct the editor to write the file and quit the editor?

5. What key quits the more utility and displays the shell prompt?

6. What command starts a child shell as the super user, taking on root's identity and environment?

7. Which wildcard characters can be used for searching all the files in the system that start with "A"?

8. The user name or login name of the super user is????

[Code]....

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Sep 17, 2009

Is there anyway to delete certain paragraphs within a text file and then insert the paragraph into another text file.I just cannot figure out how to remove the specific lines from the file and then insert them into another file at a certain line within that new file. Thanks again

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We had seen some time ago, various tricks to remove the character MS-DOS text files on Linux. Here is a new trick to do this directly from the vim editor.
to convert a file opened with vim in UNIX format, simply use the following command code...

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Aug 11, 2010

I need a lightweight GUI text editor on my Ubuntu Lucid system which lets me specify a Unicode code point (e.g. U+1234), and inserts that character to a UTF-8 text document. I know that gedit can't do it (not even with the Character Map plugin).

I'm not interested in solutions involving any kind of emacs or vi. I'm also not interested in text editors running in the terminal (such as joe, which has this functionality). I need the absolute simplest, smallest and fastest plain text editor for Linux which lets me type a few letters, insert a few characters by their code, type some more letters, and then save the .txt file as UTF-8-encoded.

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In Vim, I can change the text up until the next instance of "X" using this command:
Code:
cfX
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Nov 5, 2010

Is there any way to add a character to the end of a line when a certain match text is matched. I have a text file where any line that contacts text XYZ a z is placed at the end.

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Jul 3, 2011

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im trying to output a list of running processes via a shell script. At the moment i got this which outputs the processes to a text file called out.

echo $(ps aux) >>out

The problem is though, the processes are all just one big block of text which makes it hard to read. Does anyone know how to sort the output to a text file so that it prints to the text file at 1 process per line? I know its probably simple but im very new to linux.

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I have bees assigned a problem which states that :

sendmail-2: Wrong number of instances of process sendmail:, expected instances equal 1 but found 0

THats it...what exactly this means and how should i proceed for solving this problem...

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Jan 28, 2009

I have a text file called file1.txt containing many lines eg.

line1
line2
line3
line4
line5
line6

Then i have another text file called file2.txt contains

3
5
6

Is there a command to remove the lines in file1.txt based on the keywords in file2.txt? note: It should remove line3,line5,line6 based on 3,5,6

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Apr 28, 2010

How could I replace text in one file with text from another file using sed?

The text in each of the files would be surrounded by a starting and ending delimiter or a starting tag, say like /* */ so to easily find them.

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Software :: Use Sed To Include A Text File In The Beginning Of Other Text Files Inside A Folder And Its Subfolders?

Jun 1, 2010

Can I use sed to include a text file in the beginning of other text files inside a folder and its subfolders? So it should be recursive.

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Jan 19, 2009

I need to insert 3-4 lines of text to the beginning of a text file. The file is a largish MYSQL dump, the result of a backup shell script. This shell script should insert the required text.I've wrestled with sed, but lost.

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Programming :: Delete Line Of Text From Text File Via Shell?

Jan 13, 2010

I have to delete a certain line of text from the a textfile via ubuntu's shell scripting.I have done research, and it seems that most people advocate the usage of sed /d option. sed makes does not edit the text file. Hence, most options I discovered involved the use of a temporary variable/textfile and then overwriting the old file with the temporary new file. Is there anyway whereby I can bypass the use of temporary storage containers? I hope there is any magical combination of commands to edit the file directly.

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Jan 8, 2011

I want to display something in my text view widget in glade using c code. that's all right.
now I need to attach a save button beneath the text view.so that on click the text view content should save as a txt file..

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Programming :: Formatting Fields And Text Being Displayed From Text File?

Feb 9, 2011

I want to display the contents of a particular log file (simple text file, I mean in Linux). But there is a problem: The contents need to be organized in a fixed format. Have a look at this log file:

sampleLog.txt

Code:

User Name: XYZ
Reported Problems Description: Blah! Blah! Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah!

[code]....

So, while displaying the contents of above file on a web page, I want to format the field names found in the log file: User Name:, Reported Problems Description:, and Remarks:. These fields may contain a variable length of text and no specific line number is assumed for them to appear on.

The desired output should look like this:

User Name: XYZ
Reported Problems Description: Blah! Blah! Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah! Blah!Blah!

[code]....

Well, what I am trying to do may sound wierd to some of you. The filed "Reported Problems Description:" can possible contain text which embeds colon (.

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May 3, 2010

a sed command to add a text before line number in text file? I have text file with 500 lines, and i want to add 3 more lines with text after line 300, OR before line 302, isn't no problem.

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Ubuntu :: Deleting File With '' In The Name

May 27, 2011

I tried running a back-up/restore script in a WordPress install to migrate from one server to another... long story made short, I ended up doing it manually and all is well on that front

The one remnant from that botched script is that it tried creating a directory 'wp-backup' and then a file inside that directory - but it tried using '' instead of '/'. So what it created was a file named 'wp-backupindex.php' with a file size of 0 bytes.

The problem is thus: I can't change the permissions nor delete the file, because of the invalid file name. I don't have direct shell access (that cost *extra*, of course) and every time I try with the web-based file manager (Quixplorer) it sees it as 'wp-backupindex.php', as though the '' is acting as an escape sequence in the file name. Same thing in FileZilla, I can't do anything to the file without it complaining about the invalid file name.

how to ixnay this one file given the limitations above (no shell access) short of calling and bugging tech support to delete the file for me?

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Aug 15, 2010

I want to grep a a file for each '#' character that starts a line, the thing is the file is utf-8 and it starts with some some characters 'ef bb bf' is there a way to have grep to work with utf-8 files ?

[Code]....

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Aug 9, 2010

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