//b/1
" ""
+testing "sort with non-default leading delim 4" "sort -t: -k1,1 input" "\
+a:b
+a/a:a
+" "\
+a/a:a
+a:b
+" ""
+
+testing "sort with ENDCHAR" "sort -t. -k1,1.1 -k2 input" "\
+ab.1
+aa.2
+" "\
+aa.2
+ab.1
+" ""
+
+testing "glibc build sort" "sort -t. -k 1,1 -k 2n,2n -k 3 input" "\
+GLIBC_2.1
+GLIBC_2.1.1
+GLIBC_2.2
+GLIBC_2.2.1
+GLIBC_2.10
+GLIBC_2.20
+GLIBC_2.21
+" "\
+GLIBC_2.21
+GLIBC_2.1.1
+GLIBC_2.2.1
+GLIBC_2.2
+GLIBC_2.20
+GLIBC_2.10
+GLIBC_2.1
+" ""
+
+testing "glibc build sort unique" "sort -u -t. -k 1,1 -k 2n,2n -k 3 input" "\
+GLIBC_2.1
+GLIBC_2.1.1
+GLIBC_2.2
+GLIBC_2.2.1
+GLIBC_2.10
+GLIBC_2.20
+GLIBC_2.21
+" "\
+GLIBC_2.10
+GLIBC_2.2.1
+GLIBC_2.1.1
+GLIBC_2.20
+GLIBC_2.2
+GLIBC_2.1
+GLIBC_2.21
+" ""
+
testing "sort -u should consider field only when discarding" "sort -u -k2 input" "\
a c
" "\