Debian :: Create File With Repeating Pattern?
Jul 22, 2010
I want to create some files of a specific size containing a repeating pattern. I did some research and found that I can create a file and fill it with (fairly) random data by using dd like so: dd if=/dev/urandom of=myfile.dat bs=$(( 1024 * 1024 )) count=100 (Creates a 100 MB file.) I found that here: Quickly creating large files.
Rather than fill a file with random data, I'd like to use these patterns: 0xaa, 0x55, 0xff, and 0x00 (one per file). Is there a simple way to accomplish this?
View 8 Replies
ADVERTISEMENT
Feb 24, 2010
I want to search a file for a particular pattern and if pattern found replace the line with new text. i am using awk 'match($0,"pattern") != 0 {print $0} ' filename to check if the pattern exists.how do i get the line number of the pattern and delete that line and replace the line with my new text?
View 1 Replies
View Related
Feb 5, 2010
I have a file, say abc.txt, whit some text lines.The I have a second file, say 123.txt where at a certain point one can read "WORD".I would like to append the whole content of abc.txt (as it appears in abc.txt) in the line after "WORD".
View 1 Replies
View Related
Nov 22, 2010
I have several (vhdl) files containing a pattern with newline characters that I need to replace by another pattern that also contains newline characters.
I start with something like:
Code:
I want to replace it by something like:
Code:
(I need to paste some lines)
As I need to do this (very) often I want to use a shell script.
I tried:
1.
Code:
result:
Code:
2.
Code:
result:
File remains unchanged
3.
Code:
result:
Code:
4.
Code:
result:
Displays the unchanged testfile
How I can automate the pattern replacement?
Code:
View 9 Replies
View Related
May 27, 2010
Mainboard: ASUS A8N-SLI. X window manager:GNOME. When in wine application,such as starcraft or "Plants vs zombies",Sound is on for several seconds then mute several seconds then repeats......
Audio Controller info from Device Manager:
ALSA Capture
NVidia CK804 with ALC850
/dev/snd/pcmC0D0c
NVidia CK804 with ALC850
/dev/snd/pcmC0D1c
[Code].....
View 1 Replies
View Related
Apr 29, 2010
I have to enhance the behaviour of a backup script written in perl. I don't need to change it, what I need to do is to create a bash script that does some checks like file name and file size, execute the backup script then check if the backup files match the original files.Here's how I try to do it:
- read the files from the original files folder
- store them in an array
- search in the array the files that have a specific file extension
- store the file names that match the search pattern (I know the backup script skips some files so I can hardcode the search pattern)
- run the backup script
- read the files from the backup folder
- store them in an array
- compare the original files name and size stored in an array with those from the backup folder
- send a report email
View 3 Replies
View Related
Aug 30, 2009
I'm writing a bash script to search html files, and when I find any occurrence of an img src tag like this:
<img src="123-picture-normal.jpg" alt="some random user entered text" border="0">
I want to add a second line below it that looks like:
<img src="123-picture-thumbnail.jpg" alt="some random user entered text" border="0">
All I need to do is duplicate the line but replace "normal" with "thumbnail"
Each file can have multiple img src tags with different numbered jpgs.
I have a feeling this is a job for sed, but I'm struggling with it. Any ideas?
View 2 Replies
View Related
Sep 20, 2015
I want to back up an entire Linux system on a 3Tb external Western DIgital USB3 drive.
I do not want to reformat it from what it is, apparemtly NTFS.
Is there a utility that can act like a file manager like mc, that will permit me to create an ever expanding (to 320Gb) TAR file that will retain all the original file permissions. I have had nothing but disappointment with Linux backup utils with a FAT32 external drive, and I am concerned if I just try an tar the entire drive at once, with around 3 million files, I might run out of memory.
View 5 Replies
View Related
Jul 26, 2011
i'm just curious if i can search for the dir/file pattern in the single "find" command?
here is an example:
dir1/dir2/dir3/file.txt
dirXX/dirYY/dir2/dir3/file.txt
dir1/dir4/dir3/file.txt
i want to search for the pattern "dir2/dir3/file.txt"
View 12 Replies
View Related
Oct 11, 2010
I want to go through a log file and find pattern1 and then a pattern2 only after pattern 1.So for example I want to know howManyRecords was in 13:30.I figured I grep for "start time for the job" and then only after that (and before the next occurence of that) grep for "howManyRecords". Is this a sane way?
View 1 Replies
View Related
Jun 11, 2010
I want to replace a pattern in a file.The file format is given below.
111111
path=/home/fun/
222222
path=/home/fun/
[Code]....
I want to replace "path=/home/fun" with another pattern, but only under "111111", all the others should be the same.
View 14 Replies
View Related
Sep 25, 2010
I would like to write a newline delimeted rules file using PCREs for use with the grep command. Grep has the option -f to obtain the search pattern from a file, and option -P to search using PCREs. However, these two options do not work together. The -f option only seems to work with fixed string rules.A friend previously helped me get around this limitation somehow, but I can't remember how he did it. I also would like the ability to add comments at the end of each rule in the file.
View 11 Replies
View Related
Jun 16, 2011
I have an interesting problem, sed '/pattern/{n;p;}' file, doesn't seem to be catching all of the matches in my file. As an example of this see below.test:
Turn
Turn
Turn
[code]....
View 5 Replies
View Related
Sep 9, 2011
I've got files in a directory as follows:
1.png
1_thumb.png
1-1.png
1-1_thumb.png
[code]....
I want to list all the files that don't have a copy with the same filename with -1 somewhere in it. So, in the example above, the results would be 3.png.
NB: the file and its copy with "-1" in it will be the same filesize, if that helps.
View 2 Replies
View Related
Apr 12, 2010
I have two files, where the 1. file has special lines that need to be updated by lines from a 2. file:file1:
foo
foo
foo 0.00 0.00 0.00 pattern
[code]....
View 1 Replies
View Related
Nov 22, 2010
I want to replace a pattern with other pattern in a textfile. But there are two same patterns,but I need two change only the second occurence. EG:
Text file is
aaaa=1
bbbb=2
cccc=3
dddd=4
[code]....
Now I want to change aaaa=x into some other entry.
View 3 Replies
View Related
Jun 6, 2010
I have a file which contains milion of records. It contains 12 columns seperated by "||" (delimeter).
First two fields contain first name and last name of a person. Now my requirement is to delete all those records from this file for which:
First two fields does not contain any alphabet.
For e.g i have below mentioned records in file:
gaurav||gandhi||123||456||789
#a%bcd||123abc||89|90||91
12345||@@@||89||123||234
***||!!!!||98||76||90
Now, last two lines should be removed from this file since first two fields does not contain any alphabet for these two records.
View 12 Replies
View Related
Jan 8, 2011
What I am attempting to do is rename some television shows into the format that my PVR will understand for the naming convention. I have a script that cleans them up about 95%, now I just cant figure out the last little detail..
For example: NCIS_01.mkv
I think it can be done in sed, but I just figure out how. I need it to be renamed to: NCIS_s01e01.mkv
How can I make sed (or something else) match the last "_" and any numbers after it until the period and then insert text between them reliably?
Depending on the show, it can be something like: This_show_name_243.avi so I need it to be more flexible than I can figure out how to do..
View 6 Replies
View Related
Mar 4, 2010
Suppose i have a file(1.txt) separated by TAB delimiter in a line
1 B AB 2
2 C AB 2
if I need to search for the records having B?? using grep.If i need to perform multiple search like line having "C and AB" or "B and AB"??
View 5 Replies
View Related
Jun 11, 2009
I want to read from the file and check for the pattern, if the line has some word like <string>: then string should be copied into buffer. Afterwards, I want to insert the same <string> with some word in the next line of the file. use sed command to perform the above mentioned operations?
View 2 Replies
View Related
Jul 21, 2015
How can i create new file doing right click on desktop or in ~/home/user1 ? It is debian jessi gnome 3.
View 2 Replies
View Related
Sep 16, 2010
I have such a file(test.txt):
abc 123 456
abc 256 145
axd 125 225
[code]...
View 8 Replies
View Related
Apr 18, 2011
Just using shell scripting, how can I insert text into the middle of a file name. The file has a predictable pattern, let's say 3 letters and 3 numbers and I want to insert text in the middle of those 2 patterns. Say ABC123 is the file name. As a result, the file name should be ABC.blah.123
View 2 Replies
View Related
Mar 6, 2010
To search a string pattern in all files in a directory and subdirectories, I am using;
Code:
grep -R "myclass::my-func(" mydirectory/
Now I want grep, to search in only specific file types say *.cc. Please help me. I have read manual of grep, but could not deduce any hint.
Best Regards.
View 7 Replies
View Related
Mar 20, 2011
I'm new to the shell scripting. can any one help in creating shell script for matching the content of the specific variable with file. it should remove that line from the file if line is containing same value as variable and keep the other content as it is.i used grep -v for accomplishing the same. But grep will remove the pattern which is similar.For eg. Assume file "test" contain datas :aaffif i used grep -v command for the pattern "a" to this file this will remove content "aa" from the file. I want the pattern only "a" should remove from the file, if it is existing. otherwise it should throw alert content not exists.
View 5 Replies
View Related
Nov 5, 2010
Using sed, I am trying to append four commas ',,,,' at the end of lines containing the pattern 'Response' in a text file with lines such as these:
6,Pulse,50,254968,14886,NA,,,,
7,Picture,8,265157,0,1,15045,2,0,15000
7,Response,1,271553,6396,1
7,Pulse,50,274969,9812,NA,,,,
8,Picture,1,290232,0,1,15045,2,0,15000
8,Pulse,50,294969,4737,NA,,,,
[Code].....
View 1 Replies
View Related
Jul 27, 2011
Environment: vim 7.3.154, Debian wheezy/sid I copy code snippet from the internet, trying to test some concepts for practice. However, there are digital number preceded, as below:
1.
2.
3.
[code]...
I try the following regular expression in vim, but that doesn't work as vim replies `Pattern not found.'
:g/^([1-9]|[1-9][0-9])./s///g
It seems that the alternation symbol does not work. What is the right symbol for alternation? Or the right syntax to remove digital number preceded?
View 1 Replies
View Related
Jan 28, 2014
I would like to create a full systembackup to a ISO/IMG-file. I've been searching and found mondorescue.org, but something is wrong with package for debian 6.
View 14 Replies
View Related
May 12, 2015
I am using GTK and C and on my application I have a Drag and drop feature.
Code: Select allicon_view = gtk_icon_view_new_with_model(create_and_fill_model(pALP));
g_object_unref(pALP->list_store); /* destroy model automatically with view */
gtk_icon_view_set_selection_mode(GTK_ICON_VIEW(icon_view), GTK_SELECTION_SINGLE);
gtk_icon_view_set_reorderable(GTK_ICON_VIEW(icon_view), TRUE);
gtk_icon_view_set_text_column(GTK_ICON_VIEW(icon_view), COL_DISPLAY_NAME);
[Code] ....
The drag and drop works fine but when I exit the application and enter again, the changes of the drops are not saved, meaning the new location is not saved. I understand that in order to save the location of the drops I need to create a menu file and write some xml, But how do I do this? it there another way?
View 0 Replies
View Related
Feb 13, 2011
I am writing little first-step-applications for my N900 (Maemo Linux). Everything worked fine till now. I already have own applications for the device, but non of them uses an external data file.
Now I am trying to create an application for my N900 which uses an external .txt file. The package is created successfully, the application is installed successfully, however the binary does not see the .txt (maybe it is not in the package?).
I am using MADDE Developer 0.6.72 to create the project skeleton. I am using Qt creator for create the code. After once the code is created successfully then I am running the following commands in MADDE Developer 0.6.72 for the updated skeleton folder created above.
I writed the following lines into MADDE developer:
<<
//create project sceleton
MADDE-0.6.72 ~/madde
- $ mad pscreate -t qt_simple skeleton
Skeleton skeleton, type=qtprog created
[Code]....
View 5 Replies
View Related
