lf quotes

* PHP string with single quote delimiter, supports two escapes \ ' and \ \* PHP string with double quotation mark delimiter, support the following escape (\ ' will output \ ', will also escape \ \):\ n line break (LF or ASCII characters 0x0A (10))\

Source: http://zhengj3.blog.51cto.com/6106/290724This repair task is designed to handle the following security issues:[1] SQL blind Injection[2] SQL Injection[3] XPath Injection[4] database error modes discovered[5] Cross-Site Scripting[6]

A flexible string. Because of the flexibility of the expression, we can use the "mapping" method to bring up a string or function. $a = ' B '; $b = ' 123 '; echo $ $a; This can output 123. But the better habit is the echo ${$a}, which is clearer. $c

Sed ' s/pattern/replace_string/' fileReplace sed ' s/lifeng/lf/' sed.txt with LF for the first lifeng of each line in Sed.txt (the source file content will not change)To replace all content, command tail plus parameter g sed ' s/lifeng/lf/g'

sed (stream editor) Function Description: Use script to process text files.Syntax: sed [-hnv][-e][-f][text file]Additional Note: SED can process and edit text files according to script instructions.Parameters:-e or--expression= the input text file

1, C , non-0 value is true, true with 1, 0 value is false, False with 0 is indicated. 2. Escape character Reference: \a Beep, Bell \b Fallback: Back one pane \f Page change \ n Line break

English title: Useful one-line SCRIPTS for SED (Unix stream editor)Original title: HANDY one-liners for SED (Unix stream editor) Finishing: Eric pement-e-mail: pemente[at]northpark[dot]edu version 5.5Translator: Joe-e-mail: hq00e[at]126[dot]com The

1 formatted output Format character conversion %c to character (ASCII value, or string of length) %ra precedence repr () function for string conversions %s precedence for string conversions with the str () function %d/% I convert to signed decimal

Three definitions of PHP strings: single quotes, double quotes, delimiters 1, and single quotes: the simplest way to specify a simple string is to enclose it with single quotes (characters. In a string enclosed by single quotes, to represent a

Sed (stream editor) Function Description: Uses scripts to process text files.Syntax: sed [-hnV] [-e ] [-f ] [text file]Note: sed can process and edit text files according to script instructions.Parameters:-E or -- expression = processes input