[Photo] worth 1000

http://www.worth1000.com/default.asp

[photo] firework photography

How to Photograph Fireworks Displays


http://www.photoxels.com/tutorial-fireworks.html

[Photo] bulb photography

http://bulbphotography.com/

[Link] on-line dictionary

金山词霸 kingsoft iciba
http://dict.iciba.com/

牛津英汉双解词典
http://bbs.sxu.edu.cn/cgi-bin/oxdict.pl
http://bbs.nuc.edu.cn/cgi-bin/oxdict.pl


Yahoo Taiwan
http://tw.dictionary.yahoo.com/search?ei=UTF-8&p=nature

[Work] sed, awk, perl

sed, awk, perl

http://www.student.northpark.edu/pemente/awk.htm


# Print the length of the longest input line:

awk '{ if (length($0) > max) max = length($0) }
END { print max }' data

# Print every line that is longer than 80 characters:

awk 'length($0) > 80' data

The sole rule has a relational expression as its pattern and it has no action—so the default action, printing the record, is used.

# Print the length of the longest line in data:

expand data | awk '{ if (x < length()) x = length() }
END { print "maximum line length is " x }'

The input is processed by the expand utility to change tabs into spaces, so the widths compared are actually the right-margin columns.
# Print every line that has at least one field:

awk 'NF > 0' data


This is an easy way to delete blank lines from a file (or rather, to create a new file similar to the old file but from which the blank lines have been removed).
# Print seven random numbers from 0 to 100, inclusive:

awk 'BEGIN { for (i = 1; i <= 7; i++)
print int(101 * rand()) }'


# Print the total number of bytes used by files:

ls -l files | awk '{ x += $5 }
END { print "total bytes: " x }'


# Print the total number of kilobytes used by files:

ls -l files | awk '{ x += $5 }
END { print "total K-bytes: " (x + 1023)/1024 }'

# Print a sorted list of the login names of all users:

awk -F: '{ print $1 }' /etc/passwd | sort

# Count the lines in a file:

awk 'END { print NR }' data

# Print the even-numbered lines in the data file:

awk 'NR % 2 == 0' data