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-rw-r--r--toys/posix/sort.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/toys/posix/sort.c b/toys/posix/sort.c
index 6f5467e1..9433aef2 100644
--- a/toys/posix/sort.c
+++ b/toys/posix/sort.c
@@ -304,9 +304,6 @@ void sort_main(void)
{
int idx, fd = 1;
- // Open output file if necessary.
- if (TT.o) fd = xcreate(TT.o, O_CREAT|O_TRUNC|O_WRONLY, 0666);
-
// Parse -k sort keys.
if (TT.k) {
struct arg_list *arg;
@@ -384,6 +381,10 @@ void sort_main(void)
if (TT.linecount) TT.linecount = jdx+1;
}
+ // Open output file if necessary. We can't do this until we've finished
+ // reading in case the output file is one of the input files.
+ if (TT.o) fd = xcreate(TT.o, O_CREAT|O_TRUNC|O_WRONLY, 0666);
+
// Output result
for (idx = 0; idx<TT.linecount; idx++) {
char *s = TT.lines[idx];