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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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curs_ins_wstr(3X)														 curs_ins_wstr(3X)

NAME
ins_wstr, ins_nwstr, wins_wstr, wins_nwstr, mvins_wstr, mvins_nwstr, mvwins_wstr, mvwins_nwstr - insert a wide-character string into a curses window SYNOPSIS
#include <curses.h> int ins_wstr(const wchar_t *wstr); int ins_nwstr(const wchar_t *wstr, int n); int wins_wstr(WINDOW *win, const wchar_t *wstr); int wins_nwstr(WINDOW *win, const wchar_t *wstr, int n); int mvins_wstr(int y, int x, const wchar_t *wstr); int mvins_nwstr(int y, int x, const wchar_t *wstr, int n); int mvwins_wstr(WINDOW *win, int y, int x, const wchar_t *wstr); int mvwins_nwstr(WINDOW *win, int y, int x, const wchar_t *wstr, int n); DESCRIPTION
These routines insert a wchar_t character string (as many characters as will fit on the line) before the character under the cursor. All characters to the right of the cursor are shifted right, with the possibility of the rightmost characters on the line being lost. No wrap- ping is performed. The cursor position does not change (after moving to y, x, if specified). The four routines with n as the last argu- ment insert a leading substring of at most n wchar_t characters. If n is less than 1, the entire string is inserted. If a character in wstr is a tab, newline, carriage return or backspace, the cursor is moved appropriately within the window. A newline also does a clrtoeol before moving. Tabs are considered to be at every eighth column. If a character in wstr is another control charac- ter, it is drawn in the ^X notation. Calling win_wch after adding a control character (and moving to it, if necessary) does not return the control character, but instead returns a character in the ^-representation of the control character. NOTES
Note that all but wins_nwstr may be macros. If the first character in the string is a nonspacing character, these functions will fail. XSI does not define what will happen if a non- spacing character follows a control character. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. SEE ALSO
curses(3X), curs_insstr(3X), curs_in_wch(3X), curs_ins_wch(3X). curs_ins_wstr(3X)
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