[SOLVED] How to find the character sequence for Ctrl-l
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I am facing a strange problem with bash. I use a mac and is using iTerm2 for terminal needs. Inside iTerm2 pressing Ctrl-l locally on my mac works, It clears the screen. But when I am ssh'ed to a RHEL box Ctrl-l just triggers a new line(pressing enter key). But on same RHEL Ctrl-works on a screen session.
Now putting this in my .inputrc works
# for Ctrl+l clear screen
"\C-l":'clear\n'
But I want to know the exact character sequence generated when pressing Ctrl-l so that I can check if any existing key sequences is overriding it.
Kindly help me out.
Last edited by jithin1987; 08-08-2011 at 09:58 AM.
Well, Ctrl-L (that is an ell, right, not a vertical bar?) is the code for New Page or Form Feed (like, kick a new piece of paper in a printer). Probably not what you want.
Ctrl-L is a single value (as are all the ASCII control characters, not the same thing as X code sequence!).
I figured out the issue. I was compiling and installing screen 4.0.3 on my own. And I replaced /etc/termcap with a custom file given in the source code. Reverting the file fixed the issue.
I guess all these mappings were defined there?
Also @tronayne how did you generate those mappings? Is there any linux app which does that?
Also @tronayne how did you generate those mappings? Is there any linux app which does that?
It's a little C program I wrote some years ago that produces everything from zero (NUL) to 255 (decimal); got written just 'cause there wasn't anything I could find a the time that did it.
Here 'tis (cross.c:
Code:
#ident "$Id: cross.c,v 1.2 2011/08/08 21:46:04 trona Exp $"
/*
* Copyright (C) 2000-2011 Thomas Ronayne
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General
* Public License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
* Name: $Source: /usr/local/cvsroot/utils/cross.c,v $
* Purpose: Display the ASCII character set as a cross-reference,
* also useful with troff (but you need tbl and the mm macros)
* Version: $Revision: 1.2 $
* Modified: $Date: 2011/08/08 21:46:04 $
* Author: T. N. Ronayne
* Date:
* $Log: cross.c,v $
* Revision 1.2 2011/08/08 21:46:04 trona
* prepare for public release
*
* Revision 1.1.1.1 2009/10/07 18:06:40 trona
* initial installation Slackware 13.0
*
* Revision 1.1.1.1 2009/01/29 15:03:25 trona
* inital
*
* Revision 1.1.1.1 2007/06/12 12:45:53 trona
* initial installation after SATA failure
*
* Revision 1.3 2006/04/23 18:29:35 trona
* print more characters
*
* Revision 1.2 2006/01/01 22:55:47 trona
* add unistd.h for getopt() function
*
* Revision 1.1.1.1 2006/01/01 22:48:42 trona
* initial on fubar
*
* Revision 1.2 1998/08/24 19:48:39 trona
* fix the spelling of Binary
*
* Revision 1.1.1.1 1998/02/12 20:11:57 trona
* initial installation
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef TRUE
# define TRUE 1
#endif
#ifndef FALSE
# define FALSE 0
#endif
static char *ascii [] = {
"NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL",
"BS", "HT", "NL", "VT", "NP", "CR", "SO", "SI",
"DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",
"CAN", "EM", "SUB", "ESC", "FS", "GS", "RS", "US", "SP"
};
extern char *optarg; /* command line argument */
extern int optind; /* command line argument ptr */
void main (int argc, char *argv [])
{
int i, j, k = 59;
int c; /* general-purpose */
int error = FALSE; /* error flag */
int topt = FALSE; /* process through tbl & troff */
int vopt = FALSE; /* verbose option */
/* process the command line arguments */
while ((c = getopt (argc, argv, "?tv")) != EOF) {
switch (c) {
case '?':
error = TRUE;
break;
case 't':
topt = TRUE;
(void) fprintf (stdout,
".PH \"''\\f3Decimal\\(emHexadecimal\\(emOctal\\(emBinary\\(emASCII\\fP''\"\n");
(void) fprintf (stdout, ".PF \"''\\f3Page %%\\fP''\"\n");
(void) fprintf (stdout, ".2C\n");
(void) fprintf (stdout, ".TS H\n");
(void) fprintf (stdout, "cB cB cB cB cB\n");
(void) fprintf (stdout, "n r n n c.\n");
(void) fprintf (stdout, "Dec Hex Octal Binary ASCII\n");
(void) fprintf (stdout, "_\n");
(void) fprintf (stdout, ".TH\n");
break;
case 'v':
vopt = TRUE;
break;
default:
(void) fprintf (stderr, "getopt() bug\n");
exit (EXIT_FAILURE);
}
}
/* any errors in the arguments, or a '?' entered... */
if (error) {
(void) fprintf (stderr, "usage: %s [-t troff] [-v]\n", argv [0]);
exit (EXIT_FAILURE);
}
for (i = 0; i < 256; i++) {
if (!topt) {
if (k == 59) {
(void) fprintf (stdout,
"\tDec\tHex\tOctal\tBinary\t\tASCII\n");
k = 0;
}
}
/* print the decimal, hex, and octal */
if (!topt)
(void) fprintf (stdout, "\t");
(void) fprintf (stdout, "%03d\t%03x\t%04o\t", i, i, i);
/* print the binary */
for (j = sizeof (char) * 8 - 1; j >= 0; j--) {
(void) fprintf (stdout, "%c",
((1 << j) & i) ? '1' : '0');
}
(void) fprintf (stdout, "\t");
/* unprintable? */
if (i < 33) {
(void) fprintf (stdout, "%s\t(Ctrl-%c)\n",
ascii [i], i+64);
} else if (i == 127) {
(void) fprintf (stdout, "DEL\n");
} else if (i < 255) {
if (topt) { /* output for troff? */
switch (i) {
case 61: case 95:
(void) fprintf (stdout, "\\&%c\n", i);
break;
case 92:
(void) fprintf (stdout, "%ce\n", i);
break;
default:
(void) fprintf (stdout, "%c\n", i);
break;
}
} else { /* just print it */
(void) fprintf (stdout, "%c\n", i);
}
} else {
(void) fprintf (stdout, ".\n");
}
if (!topt) {
k++;
}
}
if (topt) {
(void) fprintf (stdout, ".TE\n");
(void) fprintf (stdout, ".1C\n");
}
exit (0);
}
You may want to change the definition of main to int instead of void; old habits die hard.
You run it as cross; pipe the output to pg, more or lp.
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