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
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.
Is there a way to process individual characters one-by-one from a text file in Bash, or is that hoping for a little too much from this lovable old clunker?
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how to work properly on the windows forms application in c++.
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I wanted to know how to organize the words in the text file ? i mean how can i just get the number of infected people in USA , number of infected in CANADA (if they exist) from all the text file and change it to a file with precise data.that is to eliminate the unneeded information such as the the characteristics and the useless ideas? and what if i also wanted to know the characteristics of the virus in a country+the number of infected?. How can i do it?
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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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Code:
Now from what i understand the same thing is possible in perl using regular expressions. But i cant get it to work.
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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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Code: #!/bin/bash echo "Changing password for user $USER."
I have a .txt-file with ~50.000 lines of numbers, generated by a mathematics program. From this file, I need line ~ 1.100 to line ~16.000 (these lines are always the same btw, this may make the solution easier, dunno) to be copy/pasted to another file, where the lines ~500 to ~15.000 (also, every time the same) should be overwritten by the aforementioned lines...I haven't found or come up with anything that works yet, mostly I find solutions to copy everything from one file to another but I can't find something to specifically overwrite a part of a file with part of another.
i have a file thunderbird which size 1.57GB, that files contain the email that had been deleted but fortunately not been compact so i still can retrive the email that had been deleted the problem the superior not give me the specific of the subject or date on the file.
Code:
X-Mozilla-Status: 0001(this number sometimes not same) X-Mozilla-Status2: 0000080(this number sometimes not same)
what i need is change the contain number 0001 to 0 in X-Mozilla-Status not the X-Mozilla-Status2, is there any way to do, and the file contain so much text like that so i want to change automatically.
I need to change all number 10 in a text file to word form, or in short from 10->ten. the thing is number 10 including in dates such as 10/22/1997 or 03-10-2011 should not be changed. im having some trouble because the file contains numbers like "price range from 10-50k".
this is just a sample.
name: john smith birthday: 10-11-1995 date hired: 05/10/2010 expected salary: 10-50k typing speed: 10 wpm
[Code].....
Using sed command is it possible to change like this..
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.
I have installed KDE 4.6.1, on distribution Ubuntu 10.10 . But i have problem with trash icon. Even when i delete a simple text file, trash icon not change, shows empty icon. When I open trash directory location from dolphin, left side shortcuts, it shows empty directory.Is it a bug? Where is my deleted file gone?
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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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.
