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-rw-r--r--coreutils/tr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/coreutils/tr.c b/coreutils/tr.c
index e439fcb5b..28798fe4f 100644
--- a/coreutils/tr.c
+++ b/coreutils/tr.c
@@ -138,7 +138,7 @@ static unsigned int expand(const char *arg, char *buffer)
arg += 3; /* skip CHAR=] */
continue;
}
- if (*arg != '-') { /* not [x-...] - copy verbatim */
+ if (i == '\0' || *arg != '-') { /* not [x-...] - copy verbatim */
*buffer++ = '[';
arg--; /* points to x */
continue; /* copy all, including eventual ']' */