Is this how I do a crontab? Just put it in the file?
- by alex
crontab -e
Then, paste it in?
5 * * * * python /home/alex/scanTags.py
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Search found 27515 results on 1101 pages for 'embedded linux'.
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vim: highlight bash scripts?
- by ajsie
my vim editor auto highlights php files, html files and so on. but when i type: vim scriptname and inside it write a bash script, it doesnt highlight it. how come?Read the article
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Is using Natural Join or Implicit column names not a good practice when writing SQL in a programming
- by Jian Lin
When we use Natural Join, we are joining the tables when both table have the same column names. But what if we write it in PHP and then the DBA add some more fields to both tables, then the Natural Join can break? The same goes for Insert, if we do a insert into gifts values (NULL, "chocolate", "choco.jpg", now()); then it will break the code…Read the article
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how to create a window in c
- by astha goyal
hello i want to create a window,for that i know i hve to use gtk+ toolkit bt how to use it???Read the article
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how can exec change the behavior of exec'ed program
- by R Samuel Klatchko
I am trying to track down a very odd crash. What is so odd about it is a workaround that someone discovered and which I cannot explain. The workaround is this small program which I'll refer to as 'runner': #include <stdio.h> #include <unistd.h> #include <string.h> #include <errno.h> int main(int argc, char *argv[]) { …Read the article
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MySQL - ERROR 1045 - Access denied
- by Abs
In some way I have managed to get this error when I try to access into MySQL via the command line: [root@localhost ~]# mysql -u root -p Enter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) I have tried resetting the password without any luck using this HowTo. I have uninstalled mysql completley and…Read the article
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setting mailx default smtp relay
- by Arthur
I heave searched Google for this and cannot seem to find a soloution I have bsd-mailx on my server and it sends mail just fine However I wished to have a development environment at home. I need mailx such that php can use its mail function. However the mail is failing to resolve the domain name @gmail.com I am aware that my ISP talk talk may…Read the article
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Writing Device Drivers for Microcontrollers, where to define IO Port pins?
- by volting
I always seem to encounter this dilemma when writing low level code for MCU's. I never know where to declare pin definitions so as to make the code as reusable as possible. In this case Im writing a driver to interface an 8051 to a MCP4922 12bit serial DAC. Im unsure how/where I should declare the pin definitions for The CS(chip select) and…Read the article
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Regex for capturing number in brackets
- by neversaint
I have a lines like this NF419andZNF773 (e=10^-92,). ZNF571 (e=2 10^-14,) What's the regex for extracting the results above so that it gives NF419andZNF773 - 10^-92 ZNF571 - 2 10^-14 I tried this but fail. $line =~ /(\w+)\s\(e=\s(.*),\)/; print "$1 - $2\n";Read the article
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Problem with Ruby script output being stored into a file
- by nickf
I have a Ruby script that outputs a heap of text. As an example: puts "line 1" puts "line 2" puts "line 3" # etc... (obviously, this isn't how my script works..) There's not a lot of data - perhaps about 8kb of character data in total. When I run the script on the command line, it works as expected: $ ./my-script.rb line 1 line 2 line 3 …Read the article
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Using Regex groups in bash
- by AlexeyMK
Greetings, I've got a directory with a list of pdfs in it: file1.pdf, file2.pdf, morestuff.pdf ... etc. I want to convert these pdfs to pngs, ie file1.png, file2.png, morestuff.png ... etc. The basic command is, convert from to, But I'm having trouble getting convert to rename to the same file name. The obvious 'I wish it worked this…Read the article
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Custom installation directories
- by Alex Farber
Let's say I am writing installation script for the program which contains executable file and shared library. By default, this script places executable to /usr/local/bin, and shared library to /usr/local/lib. In this case my program may be executed by any user by typing its name in the command line. Suppose that user selects custom…Read the article
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how to get ip address of my computer
- by asthagoyal
hello i want to get ipaddress of my computer in variable ip thru this code but it assign nothing in ip char comm[100]; int s=0; char ip[100]; sprintf(comm,"export ip=`/sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'`"); s=system(comm); printf("\n ip is %s",ip);Read the article
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SED: Matching on 2 patterns on the same line
- by Brian Knott
Hi I want to delete a line using sed if it matches 2 regular expressions in the same line. EG the line starts with /* and end with */ (comment). The following script will do most of that. sed -e '/^\/*/ d' -e '/*\/$/ d' filename This script will remove all lines that start with * and end with */. I want it to remove the line only…Read the article
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How to completely wipe rubygems along with rails etc
- by Earlz
Ok, so I decided I'd be cool and try to use Rails3 that's in beta. Then, things were getting hard to manage so I got rvm. I installed ruby 1.9.2-head in rvm and things were working, and then a computer restart later rails wouldn't start up. So I figured I'd just try running the system ruby and start rails in it. same error. Then, I…Read the article
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compile with -ansi -pedantic -Wall switches automatically with gcc
- by Jef Ty
We are required to compile C source codes using gcc in this manner: gcc -ansi -pedantic -Wall program.c I'm wondering how can I 'automate' this so when I enter: gcc program.c It will automatically compile with the 3 switches. Is this possible?Read the article
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cmake source and out-of-source navigation
- by idimba
Hi, cmake advises to use out-of-source builds. While in general I like the idea I find it not comfortable to navigate from out-of-source sub directory to the corresponding source directory. I frequently need the code to perform some actions with code (e.g. grep, svn command etc.). Is there an easy way in shell to navigate from…Read the article
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Operation is not valid due to the current state of the object
- by DBa
Sometimes, when running a Mono .NET application (it seems to not depend on the input data, as it does not change), I run into following situation: when trying to Dequeue an element from a (non-empty, I check its Count beforehand) Queue, an exception is thrown: Unhandled Exception: System.InvalidOperationException: Operation…Read the article
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How can I prevent default_environment variables from getting set by Capistrano's sudo action?
- by Logan Koester
My deploy.rb sets some environment variables to use the regular user's local Ruby rather than the system-wide one. set :default_environment, { :PATH =>…Read the article
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Bash script to replace spaces in file names
- by armandino
Can anyone recommend a safe solution to recursively replace spaces with underscores in file and directory names starting from a given root directory? For…Read the article
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Looking for regex to extract email addresses from /etc/passwd
- by Brent
Most of my users have email addresses associated with their profile in /etc/passwd. They are always in the 5th field, which I can grab, but they appear…Read the article
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PHP Segmentation fault when started from crond
- by Jeroen Moors
Hello, I've a php script that's started each minute from cron. It almost always runs without any problem, except for about 10 times within 24h. The…Read the article
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PIL's Image.show() brings up *two* different viewers
- by DarenW
When toying with images in the python shell, I use image.show(), where image is an instance of Image. Long ago nothing happened, but after defining a…Read the article
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Kernel - Finding written block numbers
- by SpdStr
Is there any way in the kernel to get a list of blocks that have been physically written to and the order in which they were written?Read the article
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Passing lines as args to a script
- by syker
How do I pass each line from a text file as an argument to a script I have written? So each line is then in itself a single arg to the script each…Read the article
