Programming :: SED - Keeping Start Of Line, But Drop The End?
May 3, 2010
I have a script that writes the following type lines to a file. The lines include some html tags. Here is an example:<p>Total = 5</h2></b></center>I want to keep the <p> tag, but remove the ending 3 tags. Sometimes the line can have a 1, 2, or perhaps a 3 digit Total. So I could have a Total = 125.Anyway, after the removal of the ending tags the result would be:<p>Total = 5There are some lines in the file that end with </h2></b></center> that I want to keep. These lines looks generally like this:
<p><b><center><h2>Events Summary for Sun May 02 2010</h2></center></b>
As you can see I am using sed to change the beginning and end of lines to make a very simple web page.The file actually displays ok in a browser with the extra tags on the end, but it is just sloppy work to have these unneeded tags in the output file.
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May 5, 2010
I'm extracting data from a xml file writing it to separate files then combining the results as a csv file.The problem is keeping the separate files in sync line by line.When a grep does not action I would like to put in a blank line or something to keep the lines in order.When the "<title>" is missing as in as in the first"<programme </programme>" that's where I need somethingto write to the file as dummy data to increment the line
here's the data
Code:
<programme channel="15552.dvb.guide" start="20100504200000" stop="20100504204000">
<category>Show / Game Show</category>
</programme>
<programme channel="14498.dvb.guide" start="20100504200000" stop="20100504203000">
[code]....
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May 25, 2011
I have a big csv-file wich is not formatted very well. I clean it up with removing a lot of html etc, but some of the lines breaks where they are not supposed to.What I want to do is to check next line, if it starts with 'PX' I don't want to do anything, but if it does not start with 'PX' I want to merge the two lines. That is removing the newline character on line one and replace it with a space.Can this be done with sed? (or maybe with perl or something, but I'm more familiar with sed)I've been looking und the net to find a solution, but to no result.
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Jan 26, 2015
I'm trying to automate two command lines, a synclient and a syndaemon. They both work well if I type them manually in a terminal, but if I do a littre script to do this, tap to click and scrolling don't work anymore.
This is the script I wrote:
Code: Select all#!/bin/bash
synclient VertEdgeScroll=1
syndaemon -d -t -K
exit 0
So I made a chmod +x on the file, placed it in ~/bin then change PATH to include the directory. Then I added this file in "Startup applications".
The scripts run ok, mais it has a different effect than if I run the commands manually.
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Mar 22, 2011
I have two files, file1.traj and file2.traj. Both these files contain identical data and the data are arranged in same format in them. The first line of both files is a comment.
At line 7843 of both files there is a cartesian coordinate X, Y and Z ( three digits ). And at line 15685 there is another three digits. The number of lines in between two cartesian coordinates are 7841. And there are few hundreds of thousands of lines in a file.
What I need to do is copy the X Y Z coordinate (three digits) from file1.traj at line 7843 and paste into file2.traj at the same line number as in file1.traj. The next line will be 15685 from file1.traj and replace at line 15685 at file2.traj. And I dont want other lines (data) in file2.traj get altered. This sequence shall be going on until the end of the file. Means copy and substitude the selected lines from file1.traj into file2.traj.
I tried to use paste command but I cant do for specified line alone.
Here i showed the data format in the file. I used the line number for clarity purpose.
Code:
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Nov 11, 2010
When clicking on a program to start from the drop down menu (latest example being Quadrapassel) the program starts but then the tab at the bottom of the screen disappears and the program doesn't load.
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Feb 13, 2011
I want to access a file, and check the length of every line.After, i want to check and replace all lines with length over 10 characters, with a message.Does anyone have a clue on that?
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Jul 19, 2010
I need to transfer 330G of data from a hard drive in my workstation to my NAS device. The entire network is gigabit and being run with new HP procurve switches. All machines have static IP addresses. The NAS is a Buffalo Terastation PRO which has the latest firmware, is set to jumbo frames, and has just been upgraded with 4 brand new 500G drives giving us a 1.4TB raid 5 setup. My workstation is a dual Quad core xeon box running on an Intel S5000XVN board with 8G of ram. My OS is Ubuntu 10.04 x64 running on a pair of Intel X25 SSDs in a raid mirror. The data drive is a 500G SATA drive connected to my onboard controller. The file system on the SATA drive is XFS. This problem was ongoing before I got my new workstation, before we had the GB switches, and before the NAS got new drives. When I transfer a small file or folder (less than 500M) it reaches speeds of 10-11 MB/sec. When I transfer a file or folder larger than that the speed slows to a crawl (less than 2MB/sec). It has always been this way with this NAS. Changing to jumbo frames speeds up the small transfers but makes little difference in the big ones. I verified with HP that the switches are jumbo frame capable.
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May 30, 2011
I am trying to write a program in C which compares two files and prints the line that is equal.
Here file1.txt has
and file2.txt has
Note: file2.txt consist of only a single string where as file2.txt has multiple lines. Actually im comparing two files with md5sum values.
Here is the code but it compares only first line of files..but it should compare the whole file1..and sorry iam a beginner in C can any1 sujest some modification to this code so that..it can compare file2 with entire file1
Quote:
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Jul 25, 2011
I want to insert a line at a particular line number using sed or awk. where line number is not fixed and is in form of variable.
I want to use variable in sed or awk command.I tried something like below, but no luck.
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Nov 29, 2009
My problem is this:I have a number of directories, all containing files of different name lenghts, including letters, numbers and possibly spaces. I want to recursively rename all of these files, so that only the _last_ 5 digits (not counting the extension) remain. In other words: I want to cut off all but the last 5 digits and not touch the extension.
I've tried to read up on tr, rename (perl version), sed, cut etc. and browsed through some threads here, but so far couldn't quite figure out how to do it.
If someone could point me to the right (standard) CLI tools and syntax.
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May 24, 2010
I have tried to google it around and couldn't find any good solution for it. What I want is to hook up to the kernel network hooks and for example investigate all of the packets (maybe keep some in the buffer and drop in the kernel so I could send them out lets say 10 minutes later) but from a C / C++ program perspective / level. I know it can be done via iptables but isn't there a way to do it from a program ?? I have found a library called ipq but apparently doesn't work with kernel 2.6.x anymore.
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Jun 4, 2011
I've got a non-urgent but itchy thing here - I'm implementing a drag-and-drop. All rolls well, but I'd like to have the component be "followed" - if there is a drag on the component, the form should be visible. I'd like to make a puzzle where the player can see the perimeter of the piece to see if it fits where (s)he'd want to drop it. Before I delve into the tons of code, I'd like to know if that (the following) can be done.
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Feb 9, 2011
I'm trying to make a very small script with greasemonkey to do some automatic things when a page loads. The first thing I need to do is to click on a link. I've done that. Then I need to select the 3rd element of a drop down list that appears a few moments (depending on the connection) after the link is pressed, without reloading the page (ajax or something like that). This I can't get to work, The select has no id or class, but I can get its xpath value. There is only one select on the page. I've tried both setTimeOut and the DOMNodeInserted event with no effect.
Code:
// ==UserScript==
// @name test
// @namespace "www.google.com"
// @include www.mywebpage.com
// ==/UserScript==
[Code]....
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Mar 14, 2010
So, DnD is cool - and in Java, it works. Just set the component where the drag starts to allow that:
Quote: tblMain.setDragEnabled(true);
and - yes - the rest pretty much runs itself. I have a JTextField that happily takes the drop from the JTable (be it the whole row - I'm not there yet, still working on that)...but does not raise any events. I'd like the JTextField to raise an event:
- cleaning up the received data, now it gets the raw stuff, and I need an ID from that string
- starting up another void() with the received ID
I read the tutorials but - for blisters - cannot see the "light", please shed some (light, that is)
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Jul 26, 2011
We have an application which allows user to perform Drag and Drop operations. The problem we are facing now is the application crash. System works fine for some time and allows user to perform many drag drops successfully. But after running for some time and user perform a drag and drop the system crashes.Following stack trace we are getting while system crashes.
XtDispatchEvent [Event.c]
RemoveAllPMgr [libXm.so.3]
XtCallCallbackList [Callback.c]
[code]....
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Apr 11, 2010
I have a project due for my Intro to C++ class and we are suppose to generate a file listing that will take an input of a C++ source code with .cpp extension and make a copy of it with a .lst extention that will have a line number preceding each and every line.
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Dec 29, 2010
How can I set indent in .emacs to enable my new line starts from the same position of previous line?
like this;
Hello world <enter>
Second Hello world // "S" starts right under first line's "H"
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Jan 3, 2011
I wish to add information to one of my files based on matching IDs,
Here is an example
(the id is the 3 colunm)
(the ID is the 2 colunm)
And the output i wish to be
OUTPUT:
So as you can see the ones that do not match are still present, and the ones that do match just have the extra information from file2.txt added to them.
I thought about using join but that only seems to join the ones that match displays thoes only. i would like all the information in the output file.
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Sep 12, 2010
I currently have 3 files with floating point data that I wish to have in a single file with the format:
Code:
F1 F1 F3 Output
a1 b1 c1 a1 b1 c1
a2 b2 c2 a2 b2 c2
a3 b3 c3 a3 b3 c3
a4 b4 c4 a4 b4 c4
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Feb 28, 2011
At the moment I have a flat file which is being used by a few people. I want a script to remotely change the file, so I can start logging who is doing what.At this point here is one requirement I am trying to develop. We have text blocks who pretty much look like.I hope this is somewhat clear. I try to find $param for the right $workflow and change that. Can you help me to find $$var3 and change that?
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May 29, 2010
I've never programed shell scripting.
Code goes like so:
I simply want to read a file "data.txt" line by line Then char by char and add them into a result var. The file is supossed to always contain numeric values
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Oct 18, 2010
I have two txt files containing x and y coordinates: xcoord.txt & ycoord.txt. I need to open them; read them line by line to get each coordinate; then each time I need to update Xs and Ys parameters inside another file called "dc.in" with the grabbed values.
Finally each time I need to run two exe files ( dc_2002 and st_vac) and produce corresponding output for each Xs and Ys ( dc.in is an input file for this exe files)
I have written the following code but it does not work:
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Apr 1, 2009
Was wondering if any perl guru's could help me with a quick log file adjustment. I have a text file that looks like so (tabs and newlines are revealed so you can see what separates the data):
There are maybe 100 lines of text in this file at any given time. I need to delete all duplicate lines only looking at the first bit of text prior to the first tab. It doesn't matter which one gets deleted as long as there are no two lines that begin with that same text at the beginning before the first tab. So in this example, either the fist line "1234" or the last line "1234" would need to be deleted. I already have code in my script that opens the files - I just need the code to read the text into an array and the part that would find matches based on the above criteria, and make the deletions.
If it would be easier, I can even do a system call and use SED (v4.1.5) and/or AWK (3.1.5) instead.
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Jul 7, 2011
bash 3.1.17(2) I'm trying do write a shell script which must operate on each line of an ASCII text file. So, all the code must be inside a loop, and inside the loop, the first thing should be to read the next line from the file. I have the bash read command. But it reads from stdin. Any way to make read from a file?
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Mar 8, 2011
I have a set of files containing data that I need to re-arrange into one single property list.
The files that I have look like this:
Code:
# cat uk
<string>10</string>
<string>11</string>
...
<string>29</string>
[Code]....
So the lines in the files match up but I haven't found a way of reading several files line by line.
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Aug 18, 2010
I'm trying to make another file annotation script a little speedier than it has been by the up-until-now proven method of checking the last four characters in a filename before the "dot" (eg .jpg, .psd) against a list of known IPTC categories and Exiv2 command files. It occurred to me that if one script generated a list of files in directory foo, and the same or another script sorted that list by that four-letter tag,then that list could be used(instead of a for/do/done loop on the real files in the folder) by the command-file-matching script to "vomit out" which annotator file would go with file nastynewfile.jpg, f'r'instance. The script I had been using for this task looks like this:
Code:
while read 'line';
do
sp=$(echo $line)
vc=$(echo $sp | cut -d"," -f1)
cv=$(echo $sp | cut -d"," -f2)
[code]....
Where I seem to be stuck is with how to sort the lines in templist, which may be any number of different lengths, from back to front. sort -k looked promising, except it seems only to work the other way round. I thought of invoking a
Code:
q=$(expr length $line); echo $q
n=$[q-8]; echo $n
kind of thing, but that presented the problems of how to sort by those, how to tell sort where to find them (grep?) and how to "stitch them back in" to the original list, which is what I want to sort in the first place.
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Apr 5, 2011
I have a log file with entries such as;
Where result is 0 or more.
I want to get the list of file names where result count is more than 0 (in other words filter out files names with result 0).
File name and result are in two different lines in log file.
How can i filter file name based on result?
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May 21, 2010
I have a perl/python interpreter available on the system so really as long as the script would run on a standard linux build I'll be happy.So I don't know how to program a script that would find the unique key (which if needed, can be easily stripped out and put into a separate file) and then print out the data below it without going into the other lines.
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Jul 6, 2010
I'm a bit new to Python programming and hoped that someone might be able to help with a problem I'm having. What I essentially want to do is to combine two text files line for line. I know how to do this in a bash script so to give you a better idea here's the code for that:
Code:
This is basically for adding on values to the end of a CSV file that uses ';' as the delimiter. So say file1 said:
And file2 said:
Then running this command would create merged_file1_and_file2 which would be:
The code I'm using at the moment is:
Code:
As I'm sure any experienced python programmer will see, this prints out the first line of the file "csvraw" and then all of the lines of "stamps" and then the remainder of "csvraw".
What I'd like to do is something like: (pseudo code, I know it's not python ;-))
Code:
Is this possible? I've tried googling and my Python Pocket Reference hasn't been much help. I've looked at pickling but that doesn't seem appropriate.
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