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Top Forums Shell Programming and Scripting Replace special characters with Escape characters? Post 302587613 by ctsgnb on Thursday 5th of January 2012 10:39:50 AM
Old 01-05-2012
@Laknar

Just for education purpose :

The trick is that in between a list [.....] some character have a special meaning :

The hyphen - is usually used to define and interval example : [0-9]

That is the reason why, in order to make it interpreted as litteral , it should be placed at a edge of the list (beginning or end) consider :
Code:
$ echo '!@#$%^&*()-' | sed 's/[-!@#$%^&*()]/\\&/g'
\!\@\#\$\%\^\&\*\(\)\-
$ echo '!@#$%^&*()-' | sed 's/[!@#$%^&*()-]/\\&/g'
\!\@\#\$\%\^\&\*\(\)\-

There is another special case within a list [......] :
The closing square bracket ]
This special closing square bracket - to be taken as litteral (so that the substitution will apply)- needs to be setup at the very first position in the list otherwise it is take as end of the list or unexpected behaviour may occure.

Consider the following example :
Code:
$ echo '!@#[]$%^&*()-' | sed 's/[]!@#[$%^&*()-]/\\&/g'
\!\@\#\[\]\$\%\^\&\*\(\)\-
$ echo '!@#[]$%^&*()-' | sed 's/[-!@#[$%^&*()]]/\\&/g'
!@#\[]$%^&*()-
$ echo '!@#[]$%^&*()-' | sed 's/[-!@#[]$%^&*()]/\\&/g'
!@#[]$%^&*()-


Last edited by ctsgnb; 01-05-2012 at 12:57 PM..
 

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COLORS(3)						   libbash colors Library Manual						 COLORS(3)

NAME
colors -- libbash library for setting tty colors. SYNOPSIS
colorSet <color> colorReset colorPrint [<indent>] <color> <text> colorPrintN [<indent>] <color> <text> DESCRIPTION
General colors is a collection of functions that make it very easy to put colored text on tty. The function list: colorSet Sets the color of the prints to the tty to COLOR colorReset Resets current tty color back to normal colorPrint Prints TEXT in the color COLOR indented by INDENT (without adding a newline) colorPrintN The same as colorPrint, but trailing newline is added Detailed interface description follows. Available colors: Green Red Yellow White The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red). FUNCTIONS DESCRIPTIONS
colorSet <color> Sets the current printing color to color. colorReset Resets current tty color back to normal. colorPrint [<indent>] <color> Prints text using the color color indented by indent (without adding a newline). Parameters: <indent> The column to move to before start printing. This parameter is optional. If ommitted - start output from current cursor position. <color> The color to use. <color> The text to print. colorPrintN [<indent>] <color> The same as colorPrint, except a trailing newline is added. EXAMPLES
Printing a green 'Hello World' with a newline: Using colorSet: $ colorSet green $ echo 'Hello World' $ colorReset Using colorPrint: $ colorPrint 'Hello World'; echo Using colorPrintN: $ colorPrintN 'Hello World' AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <gil@ran4.net> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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