The following trivial patch makes GNU coreutils' test recognize "=="
as a synonym for "=". This is already the case in GNU coreutils' expr,
bash, ksh, busybox ash, FreeBSD-current /bin/sh and /bin/test, and
OpenBSD's /bin/sh. These are only a few lines, so I don't think
any paperwork is needed. The following implements "==" and documents it.
--- David A. Wheeler
--- ./src/test.c.orig 2011-03-15 00:49:11.000000000 -0400
+++ ./src/test.c 2011-03-15 09:11:04.000000000 -0400
@@ -173,7 +173,8 @@
static bool
binop (char const *s)
{
- return ((STREQ (s, "=")) || (STREQ (s, "!=")) || (STREQ (s, "-nt")) ||
+ return ((STREQ (s, "=")) || (STREQ (s, "!=")) || (STREQ (s, "==")) ||
+ (STREQ (s, "-nt")) ||
(STREQ (s, "-ot")) || (STREQ (s, "-ef")) || (STREQ (s, "-eq")) ||
(STREQ (s, "-ne")) || (STREQ (s, "-lt")) || (STREQ (s, "-le")) ||
(STREQ (s, "-gt")) || (STREQ (s, "-ge")));
@@ -360,7 +361,8 @@
test_syntax_error (_("unknown binary operator"), argv[op]);
}
- if (argv[op][0] == '=' && !argv[op][1])
+ if (argv[op][0] == '=' && (!argv[op][1] ||
+ ((argv[op][1] == '=') && !argv[op][2])))
{
bool value = STREQ (argv[pos], argv[pos + 2]);
pos += 3;
--- ./doc/coreutils.texi.orig 2011-03-15 00:49:10.000000000 -0400
+++ ./doc/coreutils.texi 2011-03-15 20:10:44.000000000 -0400
@@ -11535,7 +11535,7 @@
* File type tests:: -[bcdfhLpSt]
* Access permission tests:: -[gkruwxOG]
* File characteristic tests:: -e -s -nt -ot -ef
-* String tests:: -z -n = !=
+* String tests:: -z -n = == !=
* Numeric tests:: -eq -ne -lt -le -gt -ge
* Connectives for test:: ! -a -o
@end menu
@@ -11726,6 +11726,11 @@
@cindex equal string check
True if the strings are equal.
+@item @var{string1} == @var{string2}
+@opindex ==
+@cindex equal string check
+True if the strings are equal (synonym for =).
+
@item @var{string1} != @var{string2}
@opindex !=
@cindex not-equal string check
