Questions and answers.
Tools to check broken links for websites. This tool is great for broken link checking: http://www.brokenlinkcheck.com/ . It check all your site automatically. W3C also has a tool to check a single page: http://validator.w3.org/checklink There is also an open-source tool LinkChecker: http://wummel.github.io/linkchecker/ If you are using WordPress, a plugin is also available: http://wordpress.org/plugins/broken-link-checker/
PuTTY is a great SSH client on Windows. However, how to save it’s profiles/sessions that I saved so that I can migrate my settings from one machine to another? PuTTY saves its settings in the registry of Windows. You can find it in the registry editor by run regedit under: HKEY_CURRENT_USERSoftwareSimonTatham You can save your…
How to set up MySQL replication. And for debugging purpose, it will be great if I can run multiple MySQL instances on a single host. To set up MySQL replication, check these tutorials: MySQL Replication MySQL replication setup You can Setup multiple MySQL instances on single server.
How to host a domain name registered in another account in one Dreamhost account. Simply trying to add the new domain, it reports: Error! You can’t add that domain: already in our system You need to delete the domain from your hosting (DNS) from the account first. Don’t worry, the domain name is still there…
How to change an attachment’s parent post in WordPress? The in WordPress posts depends on the child-parent relationship. It will be good to change the parent posts for attachments. The Change Media Parent WordPress plugin works great for me. After installing and activating it, a link to change the parent appears in the media control…
Where is the .mli files for Core installed by opam. It is under ~/.opam/4.00.1/lib/core where 4.00.1 is the version of OCaml used. For example, date.mli is under ~/.opam/4.00.1/lib/core/date.mli.
Sending emails securely is needed for certain situations, such as sending my bank account to my wife, giving my account password to my close friend for a while. How to send it? Regarding the recent US PRISM program, it is an important issue. Seeing your solution, a few of my own popped up. Here are…
How to add the jane street opam repository is introduced here. Here, we assume the branch to add is core-branch. You may need to replace the core-branch with the branch you need. $ git clone -b core-branch https://github.com/janestreet/opam-repository.git $ opam repo add js opam-repository Or, directly add the remote branch as an opam repository. $…
How to import 3rd party libraries (e.g. not standard libraries) in OCaml? An answer by Gabriel Scherer on how to import Batteries is just great and answers this question with much information. Although it is for Batteries, the method is general. The OCaml compiler (or toplevel, etc.) will find with no additional information only the…
Excerpt in homepage, category, tag and author pages for WordPress theme Twenty Thriteen. Also add the “read more” link after the excerpt. The patch: diff –git a/wp-content/themes/twentythirteen/content.php b/wp-content/themes/twentythirteen/content.php index 4f61b22..53b4686 100644 — a/wp-content/themes/twentythirteen/content.php +++ b/wp-content/themes/twentythirteen/content.php @@ -30,7 +30,7 @@ </div><!– .entry-meta –> </header><!– .entry-header –> – <?php if ( is_search() ) : // Only display…
Technical discussions on Redis. Redis internal documentation: http://redis.io/topics/internals Redis manifesto, the philosophy behind Redis: http://oldblog.antirez.com/post/redis-manifesto.html Redis Architecture: Overview Of Redis Architecture Redis data model and eventual consistency: http://antirez.com/news/36
What’s the max array length in OCaml. You can check it by: # Sys.max_array_length;; On 64-bit machine: # Sys.max_array_length;; – : int = 18014398509481983 On a 32-bit machne: # Sys.max_array_length;; – : int = 4194303 This is due to the memory representation of arrays. 64 Bit machines are better here. And AFAIK, OCaml was developed…
Good tutorials on Vim regular Expressions. Vim Regular Expressions: http://www.softpanorama.org/Editors/Vimorama/vim_regular_expressions.shtml Another good one in Chinese: http://www.study-area.org/tips/vim/Vim-10.html
How to find out the number of CPU cores on a Linux host. Use the command nproc. $ nproc nproc – print the number of processing units available: man page of nproc.
Installing Fedora 19, Error “you have not created a bootloader stage1 target device” . It seems appear from Fedora 15: http://forums.fedoraforum.org/showthread.php?t=271743 This can be solved by adding noefi nogpt to the kernel parameters when booting the Linux for installation in grub as follows. Note: the “_” between nogpt and root is the cursor, not the…
How to find out and change the storage engine of tables in MySQL databases? Find out the storage engine of a table in a database: SELECT ENGINE FROM information_schema.TABLES WHERE TABLE_SCHEMA = ‘database’ AND TABLE_NAME = ‘table’ Change the storage engine of a table: ALTER TABLE table ENGINE = type type can be innodb or…
I see this message in the error log of httpd: PHP Fatal error: Maximum execution time of 30 seconds exceeded in and PHP Fatal error: Allowed memory size of 268435456 bytes exhausted How to change them to a longer and larger value? To change the allowed maximum memory usage of PHP: Set memory_limit = 256M…
How to change strings in MySQL tables? e.g. I want to change domain.com to www.domain.com. Use the REPLACE functions of MySQL: http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace One example is like this: UPDATE table SET field = REPLACE(field, ‘domain.com’, ‘www.domain.com’) WHERE field LIKE ‘%domain.com%’ The WHERE clause is not needed but can make execution faster.
How to use HP Printer connected with USB on Fedora Linux 19. Install these packages and it may ask you to download and install other plugins. Without these packages, my printer does work. # yum install hplip hplip-gui hpijs May also need to run: # hp-plugin to install plugins for the HP printer. This plays…
What are good PDF annotation tools on Linux? Preferring saving the annotation in the PDF instead of separate files or images. I find the best solution may be wine + Foxit Reader. Foxit Reader can annotate PDF files and save them. It works very well on wine. Steps to install them: Install wine # yum…