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diff --git a/bin/sh/histedit.c b/bin/sh/histedit.c
--- a/bin/sh/histedit.c
+++ b/bin/sh/histedit.c
@@ -190,7 +190,7 @@
if (el != NULL) {
if (hist)
el_set(el, EL_HIST, history, hist);
- el_set(el, EL_PROMPT, getprompt);
+ el_set(el, EL_PROMPT_ESC, getprompt, '\001');
el_set(el, EL_ADDFN, "sh-complete",
"Filename completion",
sh_complete);
diff --git a/bin/sh/parser.c b/bin/sh/parser.c
--- a/bin/sh/parser.c
+++ b/bin/sh/parser.c
@@ -70,7 +70,7 @@
* Shell command parser.
*/
-#define PROMPTLEN 128
+#define PROMPTLEN 192
/* values of checkkwd variable */
#define CHKALIAS 0x1
@@ -2060,6 +2060,44 @@
if (*fmt == '\\')
switch (*++fmt) {
+ /*
+ * Non-printing sequence begin and end.
+ */
+ case '[':
+ case ']':
+ ps[i] = '\001';
+ break;
+
+ /*
+ * Literal \ and some ASCII characters:
+ * \a BEL
+ * \e ESC
+ * \r CR
+ */
+ case '\\':
+ case 'a':
+ case 'e':
+ case 'r':
+ if (*fmt == 'a')
+ ps[i] = '\007';
+ else if (*fmt == 'e')
+ ps[i] = '\033';
+ else if (*fmt == 'r')
+ ps[i] = '\r';
+ else
+ ps[i] = '\\';
+ break;
+
+ /*
+ * CRLF sequence
+ */
+ case 'n':
+ if (i < PROMPTLEN - 3) {
+ ps[i++] = '\r';
+ ps[i] = '\n';
+ }
+ break;
+
/*
* Hostname.
*
@@ -2136,13 +2174,6 @@
ps[i] = (geteuid() != 0) ? '$' : '#';
break;
- /*
- * A literal \.
- */
- case '\\':
- ps[i] = '\\';
- break;
-
/*
* Emit unrecognized formats verbatim.
*/
diff --git a/bin/sh/sh.1 b/bin/sh/sh.1
--- a/bin/sh/sh.1
+++ b/bin/sh/sh.1
@@ -32,7 +32,7 @@
.\" from: @(#)sh.1 8.6 (Berkeley) 5/4/95
.\" $FreeBSD$
.\"
-.Dd May 10, 2021
+.Dd December 14, 2022
.Dt SH 1
.Os
.Sh NAME
@@ -1446,6 +1446,24 @@
for superusers.
.It Li \e\e
A literal backslash.
+.It Li \e[
+Start of a sequence of non-printing characters (used, for example,
+to embed ANSI CSI sequences into the prompt).
+.It Li \e]
+End of a sequence of non-printing characters.
+.El
+.Pp
+The following special and non-printing characters are supported
+within the sequence of non-printing characters:
+.Bl -tag -width indent
+.It Li \ea
+Emits ASCII BEL (0x07, 007) character.
+.It Li \ee
+Emits ASCII ESC (0x1b, 033) character.
+.It Li \er
+Emits ASCII CR (0x0d, 015) character.
+.It Li \en
+Emits CRLF sequence.
.El
.It Va PS2
The secondary prompt string, which defaults to

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