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Full Discussion: sed replacing specific characters and control characters by escaping
Top Forums Shell Programming and Scripting sed replacing specific characters and control characters by escaping Post 302633913 by Corona688 on Wednesday 2nd of May 2012 04:09:38 PM
Old 05-02-2012
If it's really that simple, you could just use tr and stop worrying about regex special characters, since tr doesn't have regular expressions at all, just ranges and a few character classes.

The odd '"'"' bits are to get single-quote characters inside a string that's otherwise single-quotes, since you can't escape anything in single-quotes. The colors show what's actually happening -- the single quotes end, double quotes containing a single quote begin, then it goes back to single quotes.

Code:
$ echo 'Hello ,.@/#:()'"'"'*%$+?_="!; Goodbye' | tr '[,.@/#:()'"'"'*%$+?_="!;]' '_'

Hello ___________________ Goodbye

$ echo 'Hello ,.@/#:()'"'"'*%$+?_="!; Goodbye' | tr -s '[,.@/#:()'"'"'*%$+?_="!;]' '_'

Hello _ Goodbye

$

You'd need a double-backslash \\ inside that range to get a backslash, and would need to escape [ ] - characters inside the range, but that's pretty much it for specials.
Last edited by Corona688; 05-02-2012 at 05:17 PM..
 

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LEARN ABOUT SUNOS

diffmk

diffmk(1)							   User Commands							 diffmk(1)

NAME

       diffmk - mark differences between versions of a troff input file

SYNOPSIS

       diffmk oldfile newfile markedfile

DESCRIPTION

       diffmk  compares  two versions of a file and creates a third version that includes "change mark" (.mc) commands for nroff(1) and  troff(1).
       oldfile and newfile are the old and new versions of the file. diffmk generates markedfile, which,  contains  the  text  from  newfile  with
       troff(1) "change mark" requests (.mc) inserted where  newfile differs from  oldfile. When markedfile is formatted, changed or inserted text
       is shown by  | at the right margin of each line. The position of deleted text is shown by a single *.

USAGE

       See largefile(5) for the description of the behavior of diffmk when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXAMPLES

       Example 1: An example of the diffmk command.

       diffmk can also be used in conjunction with the proper  troff requests to produce program listings with marked changes.	In  the  following
       command line:

       example% diffmk old.c new.c marked.c ; nroff reqs marked.c | pr

       the file reqs contains the following troff requests:

       .pl 1
       .ll 77
       .nf
       .eo
       .nh

       which eliminate page breaks, adjust the line length, set no-fill mode, ignore escape characters, and turn off hyphenation, respectively.

       If the characters  | and * are inappropriate, you might run  markedfile through	sed(1) to globally change them.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWdoc			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       diff(1), nroff(1), sed(1), troff(1), attributes(5), largefile(5)

BUGS

       Aesthetic  considerations  may  dictate	manual	adjustment of some output. File differences involving only formatting requests may produce
       undesirable output, that is, replacing .sp by .sp 2 will produce a "change mark" on the preceding or following line of output.

SunOS 5.10							    14 Sep 1992 							 diffmk(1)
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