bug(ls): Time Style Parser Edge Cases (Part 1)
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Description
Hi, uutils maintenrs
the first edge case is
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%\na' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 % .
drwxrwxr-x 4 relunsec relunsec 7 % ..
-rw-rw-r-- 1 relunsec relunsec 0 % 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 % a
-rwxr-xr-x 1 relunsec relunsec 3 % a@
-rw-rw-r-- 1 relunsec relunsec 3 % a~
-rwxrwxr-x 2 relunsec relunsec 77M % arch
-rw-rw-r-- 1 relunsec relunsec 13K % arch.d
-rw-rw-r-- 1 relunsec relunsec 0 % a.txt
-rw-rw-r-- 2 relunsec relunsec 3 % b
-rwxrwxr-x 2 relunsec relunsec 81M % b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%\na' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 a .
drwxrwxr-x 4 relunsec relunsec 7 a ..
-rw-rw-r-- 1 relunsec relunsec 0 a 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 a a
-rwxr-xr-x 1 relunsec relunsec 3 a a@
-rw-rw-r-- 1 relunsec relunsec 3 a a~
-rwxrwxr-x 2 relunsec relunsec 77M a arch
-rw-rw-r-- 1 relunsec relunsec 13K a arch.d
-rw-rw-r-- 1 relunsec relunsec 0 a a.txt
-rw-rw-r-- 2 relunsec relunsec 3 a b
-rwxrwxr-x 2 relunsec relunsec 81M a b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
Also
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+\na' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 .
drwxrwxr-x 4 relunsec relunsec 7 ..
-rw-rw-r-- 1 relunsec relunsec 0 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 a
-rwxr-xr-x 1 relunsec relunsec 3 a@
-rw-rw-r-- 1 relunsec relunsec 3 a~
-rwxrwxr-x 2 relunsec relunsec 77M arch
-rw-rw-r-- 1 relunsec relunsec 13K arch.d
-rw-rw-r-- 1 relunsec relunsec 0 a.txt
-rw-rw-r-- 2 relunsec relunsec 3 b
-rwxrwxr-x 2 relunsec relunsec 81M b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
also
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%100c' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 2026 M09 19, Sat 08:55:09 .
drwxrwxr-x 4 relunsec relunsec 7 2026 M08 9, Sun 08:41:37 ..
-rw-rw-r-- 1 relunsec relunsec 0 2026 M08 9, Sun 08:38:43 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 2026 M08 11, Tue 03:42:51 a
-rwxr-xr-x 1 relunsec relunsec 3 2026 M08 9, Sun 09:44:48 a@
-rw-rw-r-- 1 relunsec relunsec 3 2026 M08 9, Sun 09:44:16 a~
-rwxrwxr-x 2 relunsec relunsec 77M 2026 M08 9, Sun 06:44:55 arch
-rw-rw-r-- 1 relunsec relunsec 13K 2026 M08 9, Sun 06:45:21 arch.d
-rw-rw-r-- 1 relunsec relunsec 0 2026 M09 18, Fri 12:12:05 a.txt
-rw-rw-r-- 2 relunsec relunsec 3 2026 M08 11, Tue 03:42:51 b
-rwxrwxr-x 2 relunsec relunsec 81M 2026 M08 9, Sun 06:45:17 b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%100c' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 Sat 19 Sep 2026 08:55:09 AM EDT .
drwxrwxr-x 4 relunsec relunsec 7 Sun 09 Aug 2026 08:41:37 AM EDT ..
-rw-rw-r-- 1 relunsec relunsec 0 Sun 09 Aug 2026 08:38:43 AM EDT 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 Tue 11 Aug 2026 03:42:51 AM EDT a
-rwxr-xr-x 1 relunsec relunsec 3 Sun 09 Aug 2026 09:44:48 AM EDT a@
-rw-rw-r-- 1 relunsec relunsec 3 Sun 09 Aug 2026 09:44:16 AM EDT a~
-rwxrwxr-x 2 relunsec relunsec 77M Sun 09 Aug 2026 06:44:55 AM EDT arch
-rw-rw-r-- 1 relunsec relunsec 13K Sun 09 Aug 2026 06:45:21 AM EDT arch.d
-rw-rw-r-- 1 relunsec relunsec 0 Fri 18 Sep 2026 12:12:05 PM EDT a.txt
-rw-rw-r-- 2 relunsec relunsec 3 Tue 11 Aug 2026 03:42:51 AM EDT b
-rwxrwxr-x 2 relunsec relunsec 81M Sun 09 Aug 2026 06:45:17 AM EDT b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
or simply
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%c' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 Sat 19 Sep 2026 08:55:09 AM EDT .
drwxrwxr-x 4 relunsec relunsec 7 Sun 09 Aug 2026 08:41:37 AM EDT ..
-rw-rw-r-- 1 relunsec relunsec 0 Sun 09 Aug 2026 08:38:43 AM EDT 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 Tue 11 Aug 2026 03:42:51 AM EDT a
-rwxr-xr-x 1 relunsec relunsec 3 Sun 09 Aug 2026 09:44:48 AM EDT a@
-rw-rw-r-- 1 relunsec relunsec 3 Sun 09 Aug 2026 09:44:16 AM EDT a~
-rwxrwxr-x 2 relunsec relunsec 77M Sun 09 Aug 2026 06:44:55 AM EDT arch
-rw-rw-r-- 1 relunsec relunsec 13K Sun 09 Aug 2026 06:45:21 AM EDT arch.d
-rw-rw-r-- 1 relunsec relunsec 0 Fri 18 Sep 2026 12:12:05 PM EDT a.txt
-rw-rw-r-- 2 relunsec relunsec 3 Tue 11 Aug 2026 03:42:51 AM EDT b
-rwxrwxr-x 2 relunsec relunsec 81M Sun 09 Aug 2026 06:45:17 AM EDT b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%c' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 2026 M09 19, Sat 08:55:09 .
drwxrwxr-x 4 relunsec relunsec 7 2026 M08 9, Sun 08:41:37 ..
-rw-rw-r-- 1 relunsec relunsec 0 2026 M08 9, Sun 08:38:43 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 2026 M08 11, Tue 03:42:51 a
-rwxr-xr-x 1 relunsec relunsec 3 2026 M08 9, Sun 09:44:48 a@
-rw-rw-r-- 1 relunsec relunsec 3 2026 M08 9, Sun 09:44:16 a~
-rwxrwxr-x 2 relunsec relunsec 77M 2026 M08 9, Sun 06:44:55 arch
-rw-rw-r-- 1 relunsec relunsec 13K 2026 M08 9, Sun 06:45:21 arch.d
-rw-rw-r-- 1 relunsec relunsec 0 2026 M09 18, Fri 12:12:05 a.txt
-rw-rw-r-- 2 relunsec relunsec 3 2026 M08 11, Tue 03:42:51 b
-rwxrwxr-x 2 relunsec relunsec 81M 2026 M08 9, Sun 06:45:17 b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
also with
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%100Y' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 00000000000000002026 .
drwxrwxr-x 4 relunsec relunsec 7 00000000000000002026 ..
-rw-rw-r-- 1 relunsec relunsec 0 00000000000000002026 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 00000000000000002026 a
-rwxr-xr-x 1 relunsec relunsec 3 00000000000000002026 a@
-rw-rw-r-- 1 relunsec relunsec 3 00000000000000002026 a~
-rwxrwxr-x 2 relunsec relunsec 77M 00000000000000002026 arch
-rw-rw-r-- 1 relunsec relunsec 13K 00000000000000002026 arch.d
-rw-rw-r-- 1 relunsec relunsec 0 00000000000000002026 a.txt
-rw-rw-r-- 2 relunsec relunsec 3 00000000000000002026 b
-rwxrwxr-x 2 relunsec relunsec 81M 00000000000000002026 b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%100Y' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 .
drwxrwxr-x 4 relunsec relunsec 7 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 ..
-rw-rw-r-- 1 relunsec relunsec 0 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 a
-rwxr-xr-x 1 relunsec relunsec 3 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 a@
-rw-rw-r-- 1 relunsec relunsec 3 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 a~
-rwxrwxr-x 2 relunsec relunsec 77M 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 arch
-rw-rw-r-- 1 relunsec relunsec 13K 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 arch.d
-rw-rw-r-- 1 relunsec relunsec 0 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 a.txt
-rw-rw-r-- 2 relunsec relunsec 3 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 b
-rwxrwxr-x 2 relunsec relunsec 81M 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002026 b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
also with
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%#a' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 SAT .
drwxrwxr-x 4 relunsec relunsec 7 SUN ..
-rw-rw-r-- 1 relunsec relunsec 0 SUN 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 TUE a
-rwxr-xr-x 1 relunsec relunsec 3 SUN a@
-rw-rw-r-- 1 relunsec relunsec 3 SUN a~
-rwxrwxr-x 2 relunsec relunsec 77M SUN arch
-rw-rw-r-- 1 relunsec relunsec 13K SUN arch.d
-rw-rw-r-- 1 relunsec relunsec 0 FRI a.txt
-rw-rw-r-- 2 relunsec relunsec 3 TUE b
-rwxrwxr-x 2 relunsec relunsec 81M SUN b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%#a' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 Sat .
drwxrwxr-x 4 relunsec relunsec 7 Sun ..
-rw-rw-r-- 1 relunsec relunsec 0 Sun 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 Tue a
-rwxr-xr-x 1 relunsec relunsec 3 Sun a@
-rw-rw-r-- 1 relunsec relunsec 3 Sun a~
-rwxrwxr-x 2 relunsec relunsec 77M Sun arch
-rw-rw-r-- 1 relunsec relunsec 13K Sun arch.d
-rw-rw-r-- 1 relunsec relunsec 0 Fri a.txt
-rw-rw-r-- 2 relunsec relunsec 3 Tue b
-rwxrwxr-x 2 relunsec relunsec 81M Sun b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%##a' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 %##a .
drwxrwxr-x 4 relunsec relunsec 7 %##a ..
-rw-rw-r-- 1 relunsec relunsec 0 %##a 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 %##a a
-rwxr-xr-x 1 relunsec relunsec 3 %##a a@
-rw-rw-r-- 1 relunsec relunsec 3 %##a a~
-rwxrwxr-x 2 relunsec relunsec 77M %##a arch
-rw-rw-r-- 1 relunsec relunsec 13K %##a arch.d
-rw-rw-r-- 1 relunsec relunsec 0 %##a a.txt
-rw-rw-r-- 2 relunsec relunsec 3 %##a b
-rwxrwxr-x 2 relunsec relunsec 81M %##a b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%##a' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 SAT .
drwxrwxr-x 4 relunsec relunsec 7 SUN ..
-rw-rw-r-- 1 relunsec relunsec 0 SUN 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 TUE a
-rwxr-xr-x 1 relunsec relunsec 3 SUN a@
-rw-rw-r-- 1 relunsec relunsec 3 SUN a~
-rwxrwxr-x 2 relunsec relunsec 77M SUN arch
-rw-rw-r-- 1 relunsec relunsec 13K SUN arch.d
-rw-rw-r-- 1 relunsec relunsec 0 FRI a.txt
-rw-rw-r-- 2 relunsec relunsec 3 TUE b
-rwxrwxr-x 2 relunsec relunsec 81M SUN b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
also more edge cases
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%^^a' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 %^^a .
drwxrwxr-x 4 relunsec relunsec 7 %^^a ..
-rw-rw-r-- 1 relunsec relunsec 0 %^^a 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 %^^a a
-rwxr-xr-x 1 relunsec relunsec 3 %^^a a@
-rw-rw-r-- 1 relunsec relunsec 3 %^^a a~
-rwxrwxr-x 2 relunsec relunsec 77M %^^a arch
-rw-rw-r-- 1 relunsec relunsec 13K %^^a arch.d
-rw-rw-r-- 1 relunsec relunsec 0 %^^a a.txt
-rw-rw-r-- 2 relunsec relunsec 3 %^^a b
-rwxrwxr-x 2 relunsec relunsec 81M %^^a b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%^^a' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 SAT .
drwxrwxr-x 4 relunsec relunsec 7 SUN ..
-rw-rw-r-- 1 relunsec relunsec 0 SUN 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 TUE a
-rwxr-xr-x 1 relunsec relunsec 3 SUN a@
-rw-rw-r-- 1 relunsec relunsec 3 SUN a~
-rwxrwxr-x 2 relunsec relunsec 77M SUN arch
-rw-rw-r-- 1 relunsec relunsec 13K SUN arch.d
-rw-rw-r-- 1 relunsec relunsec 0 FRI a.txt
-rw-rw-r-- 2 relunsec relunsec 3 TUE b
-rwxrwxr-x 2 relunsec relunsec 81M SUN b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%^#a' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 %^#a .
drwxrwxr-x 4 relunsec relunsec 7 %^#a ..
-rw-rw-r-- 1 relunsec relunsec 0 %^#a 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 %^#a a
-rwxr-xr-x 1 relunsec relunsec 3 %^#a a@
-rw-rw-r-- 1 relunsec relunsec 3 %^#a a~
-rwxrwxr-x 2 relunsec relunsec 77M %^#a arch
-rw-rw-r-- 1 relunsec relunsec 13K %^#a arch.d
-rw-rw-r-- 1 relunsec relunsec 0 %^#a a.txt
-rw-rw-r-- 2 relunsec relunsec 3 %^#a b
-rwxrwxr-x 2 relunsec relunsec 81M %^#a b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%^-a' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 %^-a .
drwxrwxr-x 4 relunsec relunsec 7 %^-a ..
-rw-rw-r-- 1 relunsec relunsec 0 %^-a 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 %^-a a
-rwxr-xr-x 1 relunsec relunsec 3 %^-a a@
-rw-rw-r-- 1 relunsec relunsec 3 %^-a a~
-rwxrwxr-x 2 relunsec relunsec 77M %^-a arch
-rw-rw-r-- 1 relunsec relunsec 13K %^-a arch.d
-rw-rw-r-- 1 relunsec relunsec 0 %^-a a.txt
-rw-rw-r-- 2 relunsec relunsec 3 %^-a b
-rwxrwxr-x 2 relunsec relunsec 81M %^-a b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%^-a' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 SAT .
drwxrwxr-x 4 relunsec relunsec 7 SUN ..
-rw-rw-r-- 1 relunsec relunsec 0 SUN 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 TUE a
-rwxr-xr-x 1 relunsec relunsec 3 SUN a@
-rw-rw-r-- 1 relunsec relunsec 3 SUN a~
-rwxrwxr-x 2 relunsec relunsec 77M SUN arch
-rw-rw-r-- 1 relunsec relunsec 13K SUN arch.d
-rw-rw-r-- 1 relunsec relunsec 0 FRI a.txt
-rw-rw-r-- 2 relunsec relunsec 3 TUE b
-rwxrwxr-x 2 relunsec relunsec 81M SUN b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
here is more
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%:%a' ./ls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 %a .
drwxrwxr-x 4 relunsec relunsec 7 %a ..
-rw-rw-r-- 1 relunsec relunsec 0 %a 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 %a a
-rwxr-xr-x 1 relunsec relunsec 3 %a a@
-rw-rw-r-- 1 relunsec relunsec 3 %a a~
-rwxrwxr-x 2 relunsec relunsec 77M %a arch
-rw-rw-r-- 1 relunsec relunsec 13K %a arch.d
-rw-rw-r-- 1 relunsec relunsec 0 %a a.txt
-rw-rw-r-- 2 relunsec relunsec 3 %a b
-rwxrwxr-x 2 relunsec relunsec 81M %a b2sum
relunsec@relunsec:~/software/coreutils/target/debug$ TIME_STYLE=$'+%:%a' gnuls -lah | head -n 12
total 3.2G
drwxrwxr-x 7 relunsec relunsec 462 %:Sat .
drwxrwxr-x 4 relunsec relunsec 7 %:Sun ..
-rw-rw-r-- 1 relunsec relunsec 0 %:Sun 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 %:Tue a
-rwxr-xr-x 1 relunsec relunsec 3 %:Sun a@
-rw-rw-r-- 1 relunsec relunsec 3 %:Sun a~
-rwxrwxr-x 2 relunsec relunsec 77M %:Sun arch
-rw-rw-r-- 1 relunsec relunsec 13K %:Sun arch.d
-rw-rw-r-- 1 relunsec relunsec 0 %:Fri a.txt
-rw-rw-r-- 2 relunsec relunsec 3 %:Tue b
-rwxrwxr-x 2 relunsec relunsec 81M %:Sun b2sum
relunsec@relunsec:~/software/coreutils/target/debug$
Especially after i see https://ftp.gnu.org/old-gnu/Manuals/coreutils-4.5.4/html_node/coreutils_58.html
i see includes an example
newline='
'
ls -l --time-style="+%Y-%m-%d $newline%m-%d %H:%M"
ls -l --time-style="iso"
``
one of these examples is, i runned the second
```rust
relunsec@relunsec:~/software/coreutils/target/debug$ ./ls -l --time-style=$'+%Y-%m-%d \n%m-%d %H:%M' | head -n 9
total 3334625
-rw-rw-r-- 1 relunsec relunsec 0 2026-08-09 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 2026-08-11 a
-rwxr-xr-x 1 relunsec relunsec 3 2026-08-09 a@
-rw-rw-r-- 1 relunsec relunsec 3 2026-08-09 a~
-rwxrwxr-x 2 relunsec relunsec 80453448 2026-08-09 arch
-rw-rw-r-- 1 relunsec relunsec 12794 2026-08-09 arch.d
-rw-rw-r-- 1 relunsec relunsec 0 2026-09-18 a.txt
-rw-rw-r-- 2 relunsec relunsec 3 2026-08-11 b
relunsec@relunsec:~/software/coreutils/target/debug$ gnuls -l --time-style=$'+%Y-%m-%d \n%m-%d %H:%M' | head -n 9
total 3334625
-rw-rw-r-- 1 relunsec relunsec 0 08-09 08:38 1o6iHq6D6FKsl7187mIs65fv8LQirsHfB
-rw-rw-r-- 2 relunsec relunsec 3 08-11 03:42 a
-rwxr-xr-x 1 relunsec relunsec 3 08-09 09:44 a@
-rw-rw-r-- 1 relunsec relunsec 3 08-09 09:44 a~
-rwxrwxr-x 2 relunsec relunsec 80453448 08-09 06:44 arch
-rw-rw-r-- 1 relunsec relunsec 12794 08-09 06:45 arch.d
-rw-rw-r-- 1 relunsec relunsec 0 09-18 12:12 a.txt
-rw-rw-r-- 2 relunsec relunsec 3 08-11 03:42 b
relunsec@relunsec:~/software/coreutils/target/debug$
and i see uutils breaks the official gnu example and not work properly, that must be fixed
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the ls implementation's TIME_STYLE parsing and formatting path, then reproduce the shown cases using formats such as +%\na, +%c, +%100c, +%100Y, %#a, and %##a. Add regression coverage for the demonstrated edge cases and verify that output matches gnuls for each supported format.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- cli
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100