Eric Blake wrote:
> According to Jim Meyering on 10/28/2009 5:31 AM:
>>> * src/echo.c (usage): Likewise.
>>> Also mention the \xHH escape sequence.
>
> While we're at it, bash's builtin echo supports \E as an escape for ascii
> ESC; do we want to add that as well, for consistency across GNU projects?
Great minds think alike :)
Note gcc, perl, bash, ksh and tcsh support \e
while POSIX, dash & python do not.
commit 983b46bfa497aef12680e4a732cf5556de96a053
Author: Pádraig Brady <p...@draigbrady.com>
Date: Tue Oct 27 10:04:34 2009 +0000
echo, printf: interpret \e as the Escape character
* src/printf.c (?): Output \x1B when \e encountered.
* src/echo.c (?): Likewise.
* doc/coreutils.texi (echo invocation): Add \e to the list.
* NEWS: Mention the change in behaviour.
diff --git a/NEWS b/NEWS
index 315ae5f..87b5d11 100644
--- a/NEWS
+++ b/NEWS
@@ -35,6 +35,8 @@ GNU coreutils NEWS -*-
outline -*-
with the invoked command failing with status 1. Likewise, nohup
fails with status 125 instead of 127.
+ echo and printf now interpret \e as the Escape character (0x1B).
+
** New features
md5sum --check now also accepts openssl-style checksums.
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index c54ffb8..f1a95f3 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -10796,6 +10796,8 @@ alert (bell)
backspace
@item \c
produce no further output
+...@item \e
+escape
@item \f
form feed
@item \n
diff --git a/src/echo.c b/src/echo.c
index 90b9786..65e8c80 100644
--- a/src/echo.c
+++ b/src/echo.c
@@ -70,6 +70,7 @@ If -e is in effect, the following sequences are recognized:\n\
"), stdout);
fputs (_("\
\\c produce no further output\n\
+ \\e escape\n\
\\f form feed\n\
\\n new line\n\
\\r carriage return\n\
@@ -203,6 +204,7 @@ just_echo:
case 'a': c = '\a'; break;
case 'b': c = '\b'; break;
case 'c': exit (EXIT_SUCCESS);
+ case 'e': c = '\x1B'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
diff --git a/src/printf.c b/src/printf.c
index f6f86a5..540d7db 100644
--- a/src/printf.c
+++ b/src/printf.c
@@ -25,6 +25,7 @@
\a = alert (bell)
\b = backspace
\c = produce no further output
+ \e = escape
\f = form feed
\n = new line
\r = carriage return
@@ -108,6 +109,7 @@ FORMAT controls the output as in C printf. Interpreted
sequences are:\n\
\\a alert (BEL)\n\
\\b backspace\n\
\\c produce no further output\n\
+ \\e escape\n\
\\f form feed\n\
"), stdout);
fputs (_("\
@@ -200,6 +202,9 @@ print_esc_char (char c)
case 'c': /* Cancel the rest of the output. */
exit (EXIT_SUCCESS);
break;
+ case 'e': /* Escape. */
+ putchar ('\x1B');
+ break;
case 'f': /* Form feed. */
putchar ('\f');
break;
@@ -256,7 +261,7 @@ print_esc (const char *escstart, bool octal_0)
esc_value = esc_value * 8 + octtobin (*p);
putchar (esc_value);
}
- else if (*p && strchr ("\"\\abcfnrtv", *p))
+ else if (*p && strchr ("\"\\abcefnrtv", *p))
print_esc_char (*p++);
else if (*p == 'u' || *p == 'U')
{
