Ubuntu :: Prevent Writing New Characters In Beginning Of Output Lines
Aug 5, 2011
In Windows's CMD when you execute a command and then start writing the next one (while still executing the former one) the characters remain in the buffer and they all come up nicely to the new line once the previous command has been executed. In Ubuntu when I do this the newly typed characters annoyingly get in the beginning of the previous command's output lines. I don't really understand why isn't the default method as in Windows's CMD. I mean otherwise almost _everything_ sucks with it when compared to Unix/Linux shells/terminals (commands are longer, syntax is annoying, etc.) So I'd like to know how to do this in both Bash and Zsh.
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Jul 26, 2010
I am working with a Tcl script and have some strings in the following format (RE):
[a-zA-Z]+[0-9]{6}-[0-9]
There are some leading letters, combinations of capital and lowercase. Then six digits, followed by a hyphen, then one more digit. I would like to remove all of the leading alphabetic characters from the string. The resulting string would then be in this format: [0-9]{6}-[0-9]. In other words, six numeric digits, a hyphen, then one more digit.
I have tried:
Code:
set newstr [string trimleft $origstr alpha]
But that only removes the first alphabetic character, not all of them.
I couldn't get anything with regsub to work correctly, but I am somewhat of a noob with RE's in general and regsub in particular. There are usually 5 leading letters at the beginning of these strings, and I could in most cases get away with using string replace and constant indices to extract the substring. However, my preference is for this to be robust enough to handle all cases with 1 through n leading alphabetic characters.
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Nov 12, 2009
I've only seen this occur in cases where I'm viewing a GPG-signed message and a line wraps. A plus sign appears at the beginning of the next line. Is this something I can get rid of?
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Nov 2, 2010
I have a file with a random word on each line (3k+ lines). How can I get the lines with only five characters? I tried using grep file | more, but it returns all the words (even those less than 5 characters).
Edit: I also tried grep '.{5}' file | more but it doesn't show anything. And grep '.{5}' file | more returns all lines with four or more characters (I'm really confused about why it's doing this).
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Feb 3, 2010
I just noticed on my Ubuntu machine (ext3 filesystem) that removing write permissions from a file does not keep root from writing to it. Is this a general rule of UNIX file permissions? Or specific to Ubuntu? Or a misconfiguration on my machine? Writing to the file fails (as expected) if I do this from my normal user account.Is this normal behavior?Is there a way to prevent root from accidentally writing to a file (Preferably using normal filesystem mechanisms, not AppArmor, etc.)
I understand that root has total control over the system and can, eg, change the permissions on any file.My question is whether currently set permissions are enforced on code running as root. The idea is the root user preventing her/himself from accidentally writing to a file. also understand that one should not be logged in as root for normal operations.
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Apr 17, 2009
I would like to modify the content of a text file in Linux, in the following way:=> the file has several of these lines:./run_pest3 ./g134366.04080_0.062 x 2_d043 1 0.43 results_EC=> I want to modify all lines to be:./run_pest3 ./g134366.04080_0.062 x 2_d043 1 0.43 results_EC0.062i.e., the last number of $2 should be "attached" to the end of $7, for each line.
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Jan 29, 2011
For example, I have a file called "file" like this one:
type=strongsubj len=1 word=absolve pos=verb stemmed=y priorpolarity=positive
type=strongsubj len=1 word=unique pos=adj stemmed=n priorpolarity=neutral
type=strongsubj len=1 word=absolutely pos=adj stemmed=n priorpolarity=neutral
type=weaksubj len=1 word=taking pos=verb stemmed=y priorpolarity=positive
type=weaksubj len=1 word=friend pos=noun stemmed=n priorpolarity=positive
type=weaksubj len=1 word=usually pos=adverb stemmed=n priorpolarity=positive
type=strongsubj len=1 word=purecolor pos=anypos stemmed=n priorpolarity=negative
type=strongsubj len=1 word=accusingly pos=anypos stemmed=n priorpolarity=negative
I want to add the plural for the noun, for example if find this line:
type=weaksubj len=1 word=friend pos=noun stemmed=n priorpolarity=positive
will add one more line :
type=weaksubj len=1 word=friends pos=noun stemmed=n priorpolarity=positive
where we add "s" for the word friend
I did try to do like that:
<code>
cat file | while read LINE ; do
set -- ${line}
if [[ "${4#pos1=}" == "noun" ]];then
#I tried this line but it doesn't work properly:
v3==$(echo $line |sed 's/$3/$s') #I want to find the third word "word=friend" in that line and add "s" after that word
# I don't know what command to add this new line "$v3" to the file ???
done
</code>
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Sep 10, 2010
My C foo is terrible! I am working with some code which reads lines from a file and then reformats the lines and writes them to a new file.The input lines look like this:
Code:
+[NEOTEST?]
+[NEOTEST]
[code]...
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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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Nov 7, 2010
I am using 'sed -e /foo/d' to match lines which I want to delete from a file. I discovered I have some lines which contain random (extended?) characters like 'ủ' which I would also like to delete. The lines in the file should only contain alpha numeric characters.
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Dec 25, 2010
View the entire contents of the file / etc / passwd, showing first 10 lines of file / etc / group, 10 displayed the last line of the file / etc / group. And
- The total number of lines and characters in file pwd and grp
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Jun 29, 2011
Slackware 13.37, tested on 2 different PC;
affected: mousepad and tcl/tk applications
I am using mousepad and tcl/tk application to view text files with long lines. Sometimes ago I found that some characters (part of line) in long lines disappear. The problem is shown on a very small video. [URL]
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Nov 18, 2010
After typing "man cut" in my terminal I can't seem to find this answer.
I am trying to write several shell scripts and want to remove the 'lp:<package name>' from the beginning of each line of the output of "bzr ls" as well as any notices at the beginning of the output, leaving only file and folder paths.
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Apr 14, 2010
How can I remove characters from grep output using sed? code...
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Dec 4, 2010
I have a directory structure in my system (linux) as shown below
[Code]...
I have two owners steve and scott I have one group msngrp I want to write output as below
[Code]...
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Sep 27, 2009
ls -R recursively lists subdirectories encountered, is there a way to prevent hidden folders showing in the output?
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Oct 11, 2010
I would like to know how to remove X lines from output. i have a test file and i want the output without the first 2 lines
[root@node1 ~]# cat test
1
2
3
[code]....
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Jul 3, 2009
I have this expect process:
Code:
spawn -noecho telnet my.host.com
expect {
[code]...
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Jan 13, 2011
10.10 Headless Server, CUPS queuing to HP Deskjet via socket correctly (?), but output regardless of file type only top three lines (NOT header or date or so)
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Apr 23, 2010
Consider a situation in which you want to display only specific lines of contents from a file or of a command's output. Yes, we have head and tail commands. But, how to view all the lines of a file except the last one or vise versa when we don't know the count of lines in advance?
Consider this output:
Code:
[root@localhost ~]# ps au | grep bash
root 6316 0.0 0.0 4672 1440 tty1 Ss+ Apr22 0:02 -bash
root 20847 0.2 0.0 4672 1432 pts/0 Ss Apr23 0:12 -bash
root 21167 0.0 0.0 3920 660 pts/0 S+ 01:00 0:00 grep bash
Here, I don't want the last line (in italic) to be included in the result since the last line is due to "grep bash" in the devised command "ps au | grep bash". Well, we can rewrite the devised command:
Quote:
"ps au | grep bash | head -n 2"
But, again, here we are specifying the count of lines to be included. But, in the presented problem we don't know any count in advance!
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Mar 22, 2010
I have some big files of logs that contain errors printed by an app. They are most of the time relevant, however most of them are similar. So i figured i could check what happened between a time interval with a find.
Im using this one
Code:
And I get an output similar to this one.
Code:
Is there a way to condensate the output lines to get only one or two, indicating the start and last occurrence of a block? Or I need to create a program to do so?
Because right now I get thousands of similar lines, but when I'm scrolling through them i sometimes miss relevant information that i would've otherwise noted if it wasn't all that spammy.
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Feb 1, 2011
i need to count the number of files and put the output into a variable. i used wc -l filename but i couldnt find an option to put the output to variable. example if the number o line is 5, i need the output of echo $x is 5.
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Feb 3, 2010
I need to create a single line of output from multiple and variable lines of input in a Linux bash shell script.
My input file looks like this:
Where there may be any number of umsecondaryphonenumber lines; if there is not a umsecondaryphonenumber line for a telephonenumber, I don't want to write any output.
So, the output file should look like:
The script I have so far is:
My question is - how do print each of the elements of an array in one record - i.e. what do I put in place of howdoiprintarray?
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Jul 8, 2011
What command could I use in terminal to delete all ASCII characters? That is, delete a-z, A-Z, 0-9, and all punctuation? I have a file containing Chinese characters, and I want to remove everything else and leave just the Chinese.
I can use grep to leave only the lines that have Chinese in them, but this still leaves a lot of non-Chinese stuff on those lines. Does anyone know how I could actually remove everything that isn't Chinese?
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Jun 27, 2009
I recently upgraded my file/media server to Fedora 11. After doing so, I can no longer copy large files to the server. The files begin to transfer, but typically after about 1gb of the file has transferred, the transfer stalls and ultimately fails with the message:
"Error writing to file: Input/output error"
I've run out of ideas as to what could cause this problem. I have tried the following:
1. Different NFS versions: NFS3 and NFS4
2. Tried copying the files to different physical drives on the server.
3. Tried copying the files from different physical drives on the client.
4. Tried different rsize and wsize block sizes when mounting the NFS share
5. Tried copying the files via a different protocol. SSH in this case. The file transfers are always successful when I use SSH.
Regardless of what I do, the result is the same. The file transfers always fail after approximately 1gb.
Some other notes.
1. Both the client and the server are running Fedora 11 kernel 2.6.29.5-191.fc11.x86_64
I am out of ideas. Has anyone else experienced something similar?
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Aug 28, 2011
While modifying the definition of my PS1, I saw that "[" and "]" markers should be added to help bash to compute the right display lenght. Many exemples on the web do not use them or even mention them.I searched for a solution to add them automatically, like with sed, but I didn't find any example.Are they still needed and is there a recommandation not to use sed to define PS1?
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May 31, 2011
I've just installed Kubuntu 11.04, switched on wobbly windows effect. It runs very smooth on my Nvidia GeForce 7600 GS with dual screen twinview turned on. However, I get these lines when I drag/move the window upwards - see screenshot:
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Jun 16, 2010
I have my OpenSuse 11.1 box set up with utf-8, however, every time I try to open a file with utf-8 characters with vi it can't handle those characters properly.
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Apr 22, 2011
I have been experiencing a problem where the screen loads and after initial first few lines breaks up into multiple repetitions of lines. Reloading helps but has to be repeated when pageing down. Mail is no problem; it is supplied by my network provider. OS is openSUSE 11.2 which I update when advised. Below is a sample from the error console:
[Code]...
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Nov 24, 2009
How do you remove parts of strings using python? Such as, if I have something like:
Code:
erme1 sdifskenklsd
erme2 sdfjksliel
[code]....
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