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Top Forums Shell Programming and Scripting Request for advise on how to remove control characters in a UNIX file extracted from top command Post 302850143 by karthikram on Wednesday 4th of September 2013 02:56:13 AM
Old 09-04-2013
Request for advise on how to remove control characters in a UNIX file extracted from top command

Hi,

Please excuse for posting new thread on control characters,
I am facing some difficulties in removing the control character from a file extracted from top command,
i am able to see control characters using more command and in vi mode, through cat control characters are not visible
through cat -v i am able to see the control characters.


i tried with sed , tr -dc, od command (not sure how to handle this) nothing worked and thought of reading line by line and removing control characters but not sure how to remove the control characters, Could anyone please advise how to remove the control characters.

below is my file in vi mode having control characters

Code:
^[[7m  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                         ^[[m^O^[[K
^[[m^O12759 aaaa_a    16   0  100m 3188 2616 S  0.0  0.0   0:00.23 xxx aaaa_axxxxxx                                                                               ^[[m^O
^[[m^O24435 aaaa_a    16   0  100m 3200 2624 S  0.0  0.0   0:00.19 xxx aaaa_axxxxxx                                                                               ^[[m^O
^[[m^O25623 aaaa_a    15   0  100m 3192 2624 S  0.0  0.0   0:00.28 xxx aaaa_axxxxxx                                                                               ^[[m^O
^[[m^O29634 aaaa_a    16   0  100m 3204 2632 S  0.0  0.0   0:00.35 xxx aaaa_axxxxxx                                                                               ^[[m^O


Thanks,
Regards,
karthikram
 

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ASA(1)							    BSD General Commands Manual 						    ASA(1)

NAME
asa -- interpret carriage-control characters. SYNOPSIS
asa [file ...] DESCRIPTION
The asa utility reads files sequentially, mapping FORTRAN carriage-control characters to line-printer control sequences, and writes them to the standard output. The first character of each line is interpreted as a carriage-control character. The following characters are interpreted as follows: <space> Output the rest of the line without change. 0 Output a <newline> character before printing the rest of the line. 1 Output a <formfeed> character before printing the rest of the line. + The trailing <newline> of the previous line is replaced by a <carriage-return> before printing the rest of the line. Lines beginning with characters other than the above are treated as if they begin with <space>. EXAMPLES
To view a file containing the output of a FORTRAN program: asa file To format the output of a FORTRAN program and redirect it to a line-printer. a.out | asa | lpr DIAGNOSTICS
The asa utility exit 0 on success, and >0 if an error occurs. SEE ALSO
f77(1) STANDARDS
The asa utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). AUTHORS
J.T. Conklin, Winning Strategies, Inc. BSD
September 23, 1993 BSD
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