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"Go" shell programming: a colon followed by an equal sign, plus, minus, a question mark meaning

Original URL: http://blog.csdn.net/trochiluses/article/details/9048539default value (:-)If the variable is followed by a colon and a minus sign, then the variable is followed by the default value of the variable.$ company=$ printf "%s/n" "${company:-unknown Company}"Unknown CompanyThe actual value of the variable can remain unchanged.Colons can also be omitted without:$ company=$ printf "%s/n" "${company-nightlight Inc"$Specify default value (: =)If t

The introduction of the processing time and the method of realizing timing task in Python3 _python

passed.\n" "total:%s\n" " Second Test Total:%s% (Total_timer (times1), Total_timer (Times2))) 4. Repeatedly executing a command #! /usr/bin/env python #coding =utf-8 # Executes a command import time at the required interval , OS def re_exe (cmd, inc = 60): While True: os.system (cmd); Time.sleep (inc) Re_exe ("Echo%time%", 5) 5. Timed Tasks #! /usr/bin/env

Classical algorithm of data structure

C # Hill Sort The hill sort is to insert the component segments into the sort. using System; namespace ShellSorter { public class ShellSorter { public void Sort(int [] list) { int inc; for(inc=1;inc<=list.Length/9;inc=3*inc+1); for(;in

Linux: several common makefile templates

No, summarize the personal commonly used makefile template for later use.1. Compiling the dynamic library[Plain]View PlainCopy ############################################################# # Makefile for Shared library. # Compile the dynamic link library ############################################################# #set Your own environment option CC = g++ Cc_flag =-d_nomng-d_fileline #set Your Inc and Lib

An example of hill sort algorithm implemented by Python

This article illustrates the method of Python's implementation of hill sorting algorithm. Share to everyone for your reference. Specifically as follows: ? 1 2 3 4 5 6 7 8 9 10 11 12 13-14 def shellsort (items): Inc = Len (items)/2 while Inc:for I-xrange (len (items)): j = I temp = items[i] while J >= Inc and Items[j-inc] > Temp:items[j] = items[

Four sort algorithms for C #

(int m=0;m Console.Write ("{0}", Iarrary[m]);Console.WriteLine ();} }}Insert SortUsing System;Namespace Insertionsorter{public class Insertionsorter{public void Sort (int [] list){for (int i=1;i {int t=list[i];int j=i;while ((j>0) (list[j-1]>t)){list[j]=list[j-1];--j;}list[j]=t;}}}public class MainClass{public static void Main (){Int[] Iarrary=new int[]{1,13,3,6,10,55,98,2,87,12,34,75,33,47};Insertionsorter ii=new Insertionsorter ();Ii. Sort (iarrary);for (int m=0;m Console.Write ("{0

The basic algorithm of C # implementation

polymorphism, to help it achieve a bit. Using System; Namespace Shellsorter { public class Shellsorter { public void Sort (int [] list) { INT Inc; For (inc=1;incfor (; inc>0;inc/=3) { for (int i=inc+1;i{ int t=list[i-1]; int j=i; while ((J>

Learn point C language (33): function

1. Pass value parameter (not pointer parameter): #include  int inc(int x); int main(void) {   int num = 1;   printf("%d\n",inc(num)); /* 2 */   printf("%d\n",num);   /* 1; num 并没有改变,用作函数参数时只是复制过去 */   getchar();   return 0; } int inc(int x) {   x++;   return x; } 2. Address: Parameters are pointers, parameters are addresses #include  int 

MongoDB Data Update and operator

Reproduced1). Update ()CommandDb.collection.update (criteria, objnew, Upsert, Multi)Criteria:update query conditions, similar to those in the SQL update queryObjnew:update objects and some updated operators (such as $, $inc ... ) can also be understood as the SQL update query within the set after theUpsert: This parameter means that if there is no record of update, insert Objnew,true is inserted, default is False, not inserted.Multi:mongodb default is

MongoDB Increase and deletion check (a)

name:liufang relational database in the where in the judgment condition, and post is relative to the SET statement after the execution content.The simplest thing to update is to use a new document instead of a matching document, which is suitable for a time when the pattern structure has changed significantly. As in the following document:{  "name":"tyq",  "age":22,  “date”:newDate()}Modified to:{  "name":"tyq", “age”:22, “friends”:”liufang”}Such as:modifierLet's talk about MongoDB's powe

Basic concept of Host

random access to the data. The record can also be variable length. The index cannot be changed after it is set, but the entire record can be deleted.The linear dataset (Lds-linear data set), in effect, is a byte stream dataset, which is the only byte stream dataset format in traditional MVS. Many system functions for z/OS use this format, but it is rarely used by applications.Relative record dataset (Rrds-relative record Data set), a file format simi

Ganglia offline Installation notes

-1.4.8 -- with-gmetadMakeMake install6, run./gmetad-d 3Error while loading shared libraries: librrd. so.4Ln-s/usr/local/rrdtool-1.4.8/lib/librrd. so.4/usr/local/lib/librrd. so.4Going to run as user nobody Please make sure that/var/lib/ganglia/rrds exists: No such file or directoryMkdir-p/var/lib/ganglia/rrdsChown nobody. nobody/var/lib/ganglia/rrds7, start cp gmetad/gmetad. init/etc/init. d/gmetadChkconfig -- add gmetadChkconfig -- list gmetadCp gmond

RedHat6.2 under RRDtool installation method

*Loaded Plugins:product-id, Refresh-packagekit, security, Subscription-managerUpdating certificate-based repositories.Rpmforge | 1.9 KB 00:00rpmforge/primary_db | 7.3 MB 02:55Setting up Install ProcessResolving Dependencies--Running Transaction check---> Package rrdtool.i386 0:1.4.7-1.el5.rf'll be installed--processing Dependency:perl (RRDP) for package:rrdtool-1.4.7-1.el5.rf.i386--processing Dependency:ruby for package:rrdtool-1.4.7-1.el5.rf.i386--processing dependency:libdbi.so.0 for package:r

Ganglia Installation and configuration

A ganglia monitoring is installed for Ceph, as follows. 1. Environmental statementCeph is the 3 physical machines installed on the centos6.5: Mon0, OSD1, OSD2, so you need to install Gmond on all three machines, OSD2 on Gmetad. 2. Installation processInstall the Epel source first: RPM-IVH http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpmTo install a dependency package:Yum Install Apr-devel Expat-develInstall Gmond in Mon0 and OSD1:Yum Install ganglia ganglia-gmond

Multilayer Gmetad Configuration

# This, the metrics could appear to come from any# interface and the DNS names associated with# those IPs would be used to create the rrds.#mcast_join = 239.2.11.71Host = HDP3 (practice proves that this can only be, not localhost)Port = 8649TTL = 1}/* You can specify as many udp_recv_channels as. */Udp_recv_channel {#mcast_join = 239.2.11.71Port = 8649#bind = 239.2.11.71#retry_bind = True# Size of the UDP buffer. If You is handling lots of metrics you

Deploying ICINGA-PHP4

- -***General Options:------------------------- -------------------ICINGAPNP4 User/group:monitor Monitor Install directory:/home/monitor/Icinga HTML Dir:/home/monitor/icinga/share Config Dir:/home/monitor/icinga/etc location of RRDtool binary:/usr/bin/rrdtool Version1.3.8rrds Perl Modules:Not FOUND * * *RRD Files storedinch:/home/monitor/icinga/var/perfdata process_perfdata.pl Logfile:/home/monitor/icinga/var/log/perfdata.log perfdata files (npcd) storedinch:/home/monitor/icinga/var/spoo

How to install RRDTool in RedHat6.2

-packagekit, security, subrole-managerUpdating certificate-based repositories.Rpmforge | 1.9 kB: 00Rpmforge/primary_db | 7.3 MbpsSetting up Install ProcessResolving Dependencies--> Running transaction check---> Package rrdtool. i386. 4.7-1. el5.rf will be installed--> Processing Dependency: perl (RRDp) for package: rrdtool-1.4.7-1.el5.rf.i386--> Processing Dependency: ruby for package: rrdtool-1.4.7-1.el5.rf.i386--> Processing Dependency: libdbi. so.0 for package: rrdtool-1.4.7-1.el5.rf.i386-->

ganglia3.6.0,nginx+php build Gweb, monitor Hadoop2.2 and Hbase0.98.1

successInstall Ganglia Web>TAR-ZXVF ganglia-web-3.5.12.tar.gz>CD ganglia-web-3.5.12/>vim MakefileGdestdir =/var/www/gangliaApache_user = Apache # consistent with USER in/etc/php-fpm.d/www.conf>make InstallNginx Add ganglia file directory Access configuration>vim/etc/nginx/conf.d/defalut.confLocation/ganglia {root/var/www;Index index.html index.htm index.php;}>cd/var/www>chown Apache:apache ganglia/>mkdir-p/var/lib/ganglia/rrds>chown Nobody:nobody/var

Distributed Monitoring System ganglia configuration document

" host1 host2 Xml_port 8651 Interactive_port 8652 Rrd_rootdir "/var/lib/ganglia/rrds" The Data_source parameter defines the cluster name and the nodes in the cluster. Because of the multicast mode, each Gmond node has all the monitoring data of the node machine in the Cluster1, so it is not necessary to write all the nodes into the data_source. The proposed write is no less than 2, when the host1 node freezes, will automatically find HOST2 node to

PHP Implements user authentication and manages full source code _ php instances

PHP full source code for user authentication and Management -- Begin auth. inc -- $ Id = "xxxCOM "; If (! Isset ($ PHP_AUTH_USER )){ Header ("WWW-Authenticate: Basic realm =" $ id ""); Header ("HTTP/1.0 401 Unauthorized "); Require ('error. inc '); Exit; } $ Name = $ PHP_AUTH_USER; $ Pass = $ PHP_AUTH_PW; Require ("connect. inc "); $ Query = "select * from auth

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