how to use grep with an expression that is constantly changing... basically this is what I am trying to do:
Code: watch "mpstat -P ALL | grep -e '`date +%r`'" which, should show me my CPU usage updated every couple seconds. The grep is being used to omit lines that aren't needed (all the useful lines start with the current time.) Problem is, it seems to execute the 'date +%r' command once.
I would like grep to execute the date command every time the watch command updates.
EDIT: I've found a workaround by putting the
Code: mpstat -P ALL | grep -e "`date +%r`" All in a shell file (that I called cpustat.sh), and then executing watch ./cpustat.sh
Would still like to know if there is an actual solution without having to create a seperate file (and preferably in one line). I have tried using a function to do the mpstat and grep part, but apparently watch doesn't play nice with functions
I'm writing a program that works with text files, and I'm trying to create some filters with grep. I have various questions here, so I'll number them for clarity.
1) First of all, I'd like to know what wc -w is actually returning. The word count is less than what gedit is counting in Document Statistics, so obviously gedit is counting something (like newlines) that wc -w is not
2) Secondly, I was wondering if there was a way to grep x number of words. I'm looking for something like the -m option, but returning a certain number of words instead of lines. For example, to find the first 2000 words, do something like grep -someoption 2000 ".*" or using {1,2000}.
3) Finally, I'm trying to filter out headers and footers of a text file but having no luck. The text files are Project Gutenberg files, so they have standardized headers and footers. Here's an example: [URL]...
The header starts with "The Project Gutenberg EBook of" and ends with the line containing "START OF THIS PROJECT GUTENBERG EBOOK" The footers begin with: "End of the Project Gutenberg EBook of" My problem is, grep can find:
I can't get this simple regular expression to work for matching emails: 'w*(?:.w*)*@w*(?:.w*)*w{2,5}'
It should be working as I have tested it with regex pal and it works just fine. I think there's a problem with optional character class but I'm not sure.
im trying to get sed to read through a txt document that contains html and cant get it to copy over my code looks like Code: sed -n '/[width=468 height=60 border=0 /></a></center><hr>]/,/[<br clear=left><hr>]/p' 1.txt > 2.txt This is the code that seemed to have the best chance of working but still all it does is copy the whole txt document over instead of between these 2 expressions
Is it possible to point to a two-digit interval with regular expressions?
Background: I'm using mplayer to watch tv shows, that often have episode numbers in their names. I know how to easily add several files to the playlist by using brackets, by typing something like $ mplayer tv/South.Park.S1.E0[1-5]*avi
Is there a way to point to files 06-13 in a single expression?
I've began to develop with C++ (Eclipse+Qt) and the first problem I see is that there is not good functions for manipulating strings. if there is a library for manipulating strings with regular expressions?
i am trying to create an exclude regular expression for my build.xml. The problem is, that i am trying to find some info on which REs are acceptable/valid for ant... Is ant using standard regular expressions? POSIX ones? Since it is a java-based tool, the "Java REs" are probably valid. I am a little bit confused. If somebody can help me out with the different RE standards, i would be most obliged.
I've been loosely following this:http://norvig.com/lispy.htmlAnd I have a problem: the parsing function throws an array out of bounds exception. I thought that maybe I'm doing it wrong, so I copy and pasted the code from the page, and still the same error
Code: find /Data/ -type f -iname "*7pm*" But this doesn't: Code: find /Data/ -type f -regex *7[Pp][Mm]*
I've tried MANY variations, but I'm getting no error messages, just no returns, and yet the first find, will find the sorts of files I'm looking for. I realise a win is a win, but I'm of the understanding that the -regex switch allows for some really complex use of regular expressions - but I can't even get a very simple one to work,
I am trying to learn more about global expressions and how it is needed in changing stuff in vi and in shell scipting in general.My question is basic:
How can I add a " # " pound sign at the beginning of every line in a file. So if I want to remark out every line in a file, what would be the global expression for that? Is there a global expression cheat sheet?
I am pretty new at this topic but I would like to learn it from example. The first thing I am working on is to modify the command date to be shown as DD/MM/YY only using regular expression but I dont know how to combine what there is in the regexp tutorials online and the syntax for batch scripting. Any help?
Here is what I what. run a file test: ~# ./test Where file test is: #!/bin/bash # DATE=$( date )
[Code]..
Also if you can point me to good regexp tutorials (directed towards batch scripting), that will be great.
Lets say I have 20 files named FOOXX, where XX is the number of the file, eg 01, 02 etc. At the moment, if I want to delete all files lower than the number 10, this is easy and I just use a wildcard, eg rm FOO0* However, if I want to delete specific files ina range, eg 13-15, this becomes more difficult. rm FPP[13-15] does not work, and asks me if I wish to delete all files. Likewse rm FOO1[3-5] wishes to delete all files that begin with FOO1 So, what is the best way to delete ranges of files like this? I have tried with both bash and zsh, and I don't think they differ so much for such a basic task?
I'm struggling with a C# program to read binary records from a database. The records were created with Borland Delphi. Error: You cannot use fixed size buffers contained in unfixed expressions. Try using the fixed statement.
Here's my need: If Calendar Day= Then FCPeriod= And FCYear= Jan 11 to Feb 1002Current Year of Feb 10 Feb 11 to Mar 1003Current Year of Mar 10 Mar 11 to Apr 1004Current Year of Apr 10 Apr 11 to May 1005Current Year of May 10 May 11 to June 1006Current Year of June 10 June 11 to July 1007Current Year of July 10 July 11 to Aug 1008Current Year of Aug 10 Aug 11 to Sept 1009Current Year of Sept 10 Sept 11 to Oct 1010Current Year of Oct 10 Oct 11 to Nov 1011Current Year of Nov 10 Nov 11 to Dec 1012Current Year of Dec 10 Dec 11 to Jan 1001* Current Year of Jan 10
* Note for Dec 11 - Dec 31, The Next Year to be used IE: Current date is Dec 28th, 2010. Year = 2011 IE: Current date is Jan 8th, 2011, Year = 2011. Looks like I'll need a case statement with some regular expressions...
What I am doing is reading the text from a text document and storing all of the text inside of a ArrayList. I then set one of the values of the Arraylist as a string. I want to use regular expressions find out what the first two characters of the String are. if first two characters = "//" then function(); I only care about the first two characters though. If you need any more information, just ask.
is everytime i reboot , my keyboard is reset to USA. im in canada & it pisses me off each time i need to change it also.all my options on EMESENE is the same issue always RESET.it's like if nothing keeps the changes once rebooted.
