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Full Discussion: Clean console output routed to a file
Top Forums UNIX for Advanced & Expert Users Clean console output routed to a file Post 302549275 by bakunin on Monday 22nd of August 2011 12:08:56 PM
Old 08-22-2011
Quote:
Originally Posted by psshah
You can't even do something like "Search and Replace" as we do with newline characters in vi, because of key sequences pressed.
Sorry, but i think it is indeed possible. Here is a possible solution in sed for the backspace key - other key sequences can be done similarily. (I assume "^H" [ONE character!] to be the backspace sequence here.)

Code:
:loop
/.^H/ {
       s/.^H//
       b loop
     }

save this to a file and issue:

Code:
sed -f /path/to/cmdfile /path/to/infile > /path/to/outfile

This sed-script looks for a line with a character followed by a backspace, removes both and loops until no backspace character can be found any more. This way sequences of backspaces are deleted along with the characters they were used to remove. For example:

Code:
abcd^H^He    <- input
abc^He       <- after one pass of the loop
abe          <- after second pass of the loop

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
psshah
 

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LEARN ABOUT PLAN9

tr

TR(1)							      General Commands Manual							     TR(1)

NAME

       tr - translate characters

SYNOPSIS

       tr [ -cds ] [ string1 [ string2 ] ]

DESCRIPTION

       Tr  copies  the standard input to the standard output with substitution or deletion of selected characters (runes).  Input characters found
       in string1 are mapped into the corresponding characters of string2.  When string2 is short it is padded to the length of string1 by  dupli-
       cating its last character.  Any combination of the options -cds may be used:

       -c     Complement string1: replace it with a lexicographically ordered list of all other characters.

       -d     Delete from input all characters in string1.

       -s     Squeeze repeated output characters that occur in string2 to single characters.

       In  either  string a noninitial sequence -x, where x is any character (possibly quoted), stands for a range of characters: a possibly empty
       sequence of codes running from the successor of the previous code up through the code for x.  The character followed by 1,  2  or  3  octal
       digits  stands for the character whose 16-bit value is given by those digits.  The character sequence followed by 1, 2, 3, or 4 hexadecimal
       digits stands for the character whose 16-bit value is given by those digits.  A followed by any other character stands for that character.

EXAMPLES

       Replace all upper-case ASCII letters by lower-case.

	      tr A-Z a-z <mixed >lower

       Create a list of all the words in one per line in where a word is taken to be a maximal string of  alphabetics.	 String2  is  given  as  a
       quoted newline.

	      tr -cs A-Za-z '
	      ' <file1 >file2

SOURCE

       /sys/src/cmd/tr.c

SEE ALSO

       sed(1)

																	     TR(1)
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