General :: Display Specific Block Of Contents Or Lines In Output?

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:


[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:


"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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General :: Copying A Block Of Lines With Criteria?

Jan 27, 2011

I am having a file filled of blocks like (each is seperated with the <event> )

8 1 0.1118800E-04 0.1709000E+03 0.7546772E-02 0.1182204E+00
-1 -1 0 0 0 501 0.00000000000E+00 0.00000000000E+00 0.40846782627E+02 0.40846782627E+02 0.00000000000E+00 0. 1.
2 -1 0 0 501 0 0.00000000000E+00 0.00000000000E+00 -0.90202563950E+03 0.90202563950E+03 0.00000000000E+00 0. -1.


how can I copy this block if for example find "13" in the first column and "-1" in the last ? Then, looping to the rest of the file doing the same all over again?

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Server :: Sendmail: Block Specific Sender To Specific Recipient?

Oct 1, 2009

I'm trying to configure our mail server to block email from a specific sender reaching a specific recipient. In other words, if one of our employees is getting harassed by a 'stalker', how would one go about blocking, at the MTA (Sendmail) level, a specific sender email address from reaching a particular users inbox? We do not want to capture the email - simply block it before it consumes server resources.The Sendmail server (MTA) is a front end to our Exchange server so no user accounts exist on the Linux server. We simply use it as a SPAM and Virus scanner then forward clean email to the Exchange server.

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General :: Block A Specific MAC Address?

Feb 5, 2011

how to block a specific MAC address

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General :: Any Way To Block Specific Websites?

Jul 28, 2011

How to block unwanted sites.

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General :: Show Specific Lines In A Text File?

Feb 3, 2011

I have created a text file in Linux, and I only want to show certain users. Here is my text file:

usr user tty Limbo?
11 12:06:13 APW no
12 12:06:13 APW no


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General :: Sed - Replacing Only Text With Several Specific Lines Excluded

Jun 17, 2010

As much as I didn't want to ask a sed question, especially considering there's already one on this page I've looked as best I could and cant find the solution. Id like to use sed to replace occurrences of a pattern but exclude two or 3 specific lines that are not consecutive. For example I know with 1,10 i could exclude the first 10 lines, what is the syntax if I just wanted to exclude line 3 and 7. The sed command I'm working with right now is for rearranging Ethernets.

cat /etc/udev/rules.d/70-persistent-net.rules | sed -e '/'"$found1fullmac"'/!s/eth1/'"found1eth"'/' > /etc/udev/rules.d/70-persistent-net.rules

I would like to replace $found1fullmac with two variables representing line numbers to exclude from the replacement.

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General :: Block A Specific Content Using Squid?

Aug 24, 2010

In Iran there is a famous "access denied page" that redirects you to a strange page with a lot of HTML errors and lol, telling you RTFM about ridiculous Internet laws.I want to filter the contents of the page, because the page IP, URL, ... are all unknown.I don't know much about squid configuration scripts.I can read but cannot write

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General :: Block A Specific User To Run SSH And Leave Him The Access To FTP?

Jun 19, 2010

I run the openssh daemon on port 22 and have the proftp running on port 21. I would like to block SSH for a specific user.I use proftpd.I would like to prevent the SSH access for this user and leave the FTP working for this user specific.Into /etc/passwd, I tried to change the /bin/bash to /bin/false, but this blocks both SSH and FTP access for this account.

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General :: Save The Output To A Log File Without Wiping The Previous Contents?

Jul 25, 2010

For example, I run a program called "luck" and it outputs a sentence like "good luck". Then "./luck -> logfile" will save the output content to logfile.But when I run another program called "hello" and it outputs a sentence lie " Hello world".Then "./hello-> logfile" will save the output content to logfile and wipe the previous contents.Is is possible to keep both sentences in the logfile? Just like

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General :: Remove X Lines From Output?

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


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General :: Shell Command To Display Contents Of A File?

Feb 23, 2010

shell command to display contents of a file? Like that of .txt or .html

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General :: Dd Block Input/output Size?

Mar 8, 2010

I'm trying trying to understand dd, and I'd like to know why frequently do we have to use a block read/write size, like "dd bs=1024", "dd ibs=512"... If it executes the operation byte by byte, isn't it irrelevant? What is this block size then?

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General :: Copy Lines Starting And Ending With Specific Pattern From Multiple Files To A File?

Jul 27, 2011

A function by name abc is called in many files. I want to copy all the lines with the function call to an output file.A simple grep on function name doesn't help me as the function call is spanning across multiple lines as follows:


So I want to copy all the three lines (till semicolon) to the output file.The problem is because there are more than 200 calls for the same function and I cannot do it manually

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General :: Filtering Out Duplicate Lines From A Find/grep Output

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


And I get an output similar to this one.


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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General :: Count The Number Of Lines Inside A File And Put The Output Into A Variable?

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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General :: Create Files For Specific Output?

Mar 10, 2011

I would like to create a bash script that takes the following text and split in different files. The output is:

01012010 Message: Success1
01012010 Message: Success2


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General :: Create A Single Line Of Output From Multiple Variable Lines Of Input

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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General :: Kill All Programs On A Specific Display?

Jul 31, 2010

how to kill all Programs on a specific X display? In example, I need to kill all Programs on Display :1. How is this possible?

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Programming :: Awk - Get A Block Of Lines?

Apr 23, 2010

I tried to get a block of lines in awk, but unfortunately it returns output of one line only. I don't state the code here, because it's too short and too poor. What exactly I wanted to do: from file "/boot/grub/menu.lst" get blocks of lines, starting by title and ending by Now I have just




I want to get every block as one row of array.

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General :: Display AWK Output In Perl

Feb 8, 2011

I am trying to use awk command in perl. Below is my awk comamnd which works alone.
awk '{Easttot=Easttot+$1} END {print Easttot}' MessagesProcessedEAST2Cnts.dat
I would like to use this awk's output in shell script. I am using system command like below to get the out put. But it is not working.
$Output = system("awk '{Easttot=Easttot+$1} END {print Easttot}' MessagesProcessedEAST2Cnts.dat'");

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Programming :: Script To Break A Block Of Text On To Different Lines?

Dec 15, 2010

I have a clump of text that needs to be broke up:gdbm Sat 07 Feb 2009 03:28:18 AM EST libattr Sat 07 Feb 2009 03:28:18 AM EST db4 Sat 07 Feb 2009 03:28:19 AM EST mktemp Sat 07 Feb 2009 03:28:19 AM EST keyutils Sat 07 Feb 2009 03:28:20 AM EST pcre Sat 07 Feb 2009 03:28:21 AM EST setserial Sat 07 Feb 2009 03:28:24 AM EST zlib Sat 07 Feb 2009 03:28:24 AM EST gawk Sat 07 Feb 2009 03:28:25 AM EST readline Sat 07 Feb 2009 03:28:26 AM EST rhpl Sat 07 Feb 2009 03:28:28 AM EST cracklib-dicts Sat 07 Feb 2009 03:28:37 AM EST setools Sat 07 Feb 2009 03:28:37 AM EST hal Sat 07 Feb 2009 03:28:38 AM EST which Sat 07 Feb 2009 03:28:39 AM EST Is there a way to get everything after the EDT in the text to be moved to a new line?

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Programming :: Awk - Summing Over Specific Lines?

Mar 31, 2011

I'm struggling myself with this problem: I have a file which contains a single column of data



Is there a way to do it with awk?

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General :: Restrict Output To Display One File Each?

Jul 27, 2010

I use 'grep -Ri "mypattern" .' to search for all files in the current directory recursively that contain "mypattern". But this command returns every single occurence, so that if a given file has several occurences of the pattern, the screen fills up pretty quick. More than likely, there's a way to restrict the output so that it only displays each file once, no matter how many occurences it contains, but I couldn't find how to do it.

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General :: How Display Part Of An Output Stream

Feb 4, 2011

Though I have little experience in the past, i just can't get to work what i have in mind.i want to display part of an output stream.

cat sample.xml
<packet or="recv" ljid="d.sample@test.local/" ts="20110204T15:02:55"><message from='j.sample2@test.local/' to='d.sample@test.local' type='chat' xml:lang='en' id='sd61'>


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Programming :: Reading Specific Lines From A File?

Sep 10, 2009

To save on the writing of WAY to many files with very little in them, I want to put it all in one file and read a specific few lines. There will be six variables to be read at a time. Format is as such:

//Set 1
string name


From name to 5th number is a set. The name will be of different lengths for each set. This will be a big file of probably 40+ sets. My problem lies in reading one and only one set be it set 5 or set 34. It needs to be done in C++.

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Programming :: Remove Specific Lines From File

Jan 21, 2011

I'm trying to come up with ideas for a simple way to strip a specific "entry" from a text file.I know tools like sed and perl can remove specific lines from a file but I haven't been able to come up with an elegant way to do my group of lines.In my file, the first "Location" line and the "SVNPath" line should be unique every time... but are they enough to strip out the whole set of the group plus the trailing one line of white space separating each group? Add to this, my file will grow as new entries are added (always appended to the end) but new entries will have the same formatting.

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Ubuntu :: Block IPs When Hitting Specific URL?

Feb 11, 2011

I've noticed in my Apache logs a lot of hits to a specific URL on my server. The thing is, the URL is invalid and returns a 404. Every hit has a different Agent ID (things like Windows NT 4 and IE 8, Mac OS and Safari, Windows 7 and Mozilla, etc) and usually a slightly different IP address. If you browse the URL with Chrome/Firefox, it gets reported as potential phishing activity - despite it only returning a 404 error.

I blocked a range of IPs with IPTables which worked for a while, but I can see the IP address has changed again (outside of the range I set) and is generating logs again.

Is it possible to automatically block any IP attempting to access this specific URL?

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General :: Windows - Getting WGET To Display A Less Verbose Output?

Jun 16, 2011

Is it possible to get WGET to only show download progress e.g. download bar, opposed to all of the connection info, as it does look a little ugly on the client side, is this possible to do?

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General :: Using Cut On File Full Of Ls -l Output To Display Only Filenames?

Oct 7, 2010

I have a file that contains "ls -la" output. I would like to display only the filenames, none of the other information before it such as permissions, ownership, size, and date.Would the cut command be the best way to hit this, or should I use Vim or sed?

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