PHP does not support explicit type definition in variable declaration. For example, you CANNOT declare a variable as follows:
int $count = 10;
In PHP, a variable's type is determined by the context in which the variable is used.
A Learning Management System (LMS) is a software application which permits administration, documentation, tracking, development, reporting, of online e-learning content. LMS needs to provide enormous flexibility and fine-grained level of control for administrator, trainers, course developers, and students alike. The needs for each course and each institute are different and LMS much fulfill all their requirements. The best-known LMS are blackboard (formerly Web-CT) and Moodle. Blackboard is a licensed software while Moodle is open source.
To count files in a directory
$ ls directory | wc -l
To count all files in the directory and its subdirectories
$ ls -R directory | wc -l
mysqldump command is used to backup up MySQL databases. mysqldump has the following format:
mysqldump -u [login] -p [pass] [dbname] > [backup.sql]
where [backup.sql] is the file to which the backup should be written.
Backing up specific tables By default, mysqldump would backup the entire database. If you need to backup only specific tables, list the tables as follows:
The usort function sorts an array by values where the values are sorted by a user-defined function. usort has the following syntax
bool usort ( array &$array , callback $cmp_function )
The comparison function takes two arguments and it must return integer values, either 0, positive integer, or negative integer.
Recently, I found a really elegant solution to display a file tree using the ls command. I like is so much that I feel the need to share it. The code is:
ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'
It displays files as follows:
Batch renaming files in Linux requires writing or using a shell script. If you don't have the time to write or find a shell script to batch rename your files, simply install and use the gprename utility. It is a graphical utility which is suitable for most batch renaming tasks.
To install on Ubuntu
$ sudo apt-get install gprename
To use, simply type gprename in the terminal or Ubuntu Dashboard.
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If wget gives you the following message even though your browsers are able to access the Internet, it could be due to a problem with your /etc/resolv.conf
Resolving [some address]... failed: Temporary failure in name resolution
The solution is to edit /etc/resolv.conf and add IP addresses. On Debian systems, the file is /etc/nsswitch.conf
Emboss can access various biological databases automatically. However, this need to be configured. First of all type:
$ showdb
If you get line nothing in the list of databases, this document is for you. First we locate the emboss.default.template file.
$ locate emboss.default.template
Then cd to that directory and create copy.
An executive summary is a miniature version of a report, proposal, or portfolio. It is usually one page or shorter. It contain enough information for readers to be acquainted with the document without actually reading the entire document. Generally it contains: