Zepp-Hanzj opened a new pull request, #3571:
URL: https://github.com/apache/nuttx-apps/pull/3571
## Summary
Add modification time display to `ls -l` long format output.
**Fixes #17063**
## Details
The `ls -l` command now shows the modification time (`st_mtime`) in
`YYYY-MM-DD HH:MM` format (ISO long-iso style) between the permission
string and the file size.
Files with `st_mtime == 0` (e.g., procfs, tmpfs pseudo-entries) skip
the timestamp display to avoid showing a meaningless epoch time.
## Changes
- `nshlib/nsh_fscmds.c`: Add `#include <time.h>` and timestamp display
logic in `ls_handler()` after the permission details output.
## Verification
Built and tested on `sim:nsh` configuration.
**ls -l /**:
```
dr-xr-xr-x 0 bin/
drwxr-xr-x 2026-06-29 11:21 4096 data/
drwxrwxrwx 0 dev/
dr-xr-xr-x 0 etc/
```
**ls -l /data**:
```
-rw-r--r-- 2026-06-29 11:20 152 .version
-rw-r--r-- 2026-06-29 11:20 1883 .config.backup
drwxr-xr-x 2026-06-29 11:21 4096 binfmt/
-rw-r--r-- 2026-06-01 08:56 3107 NOTICE
-rw-r--r-- 2026-06-05 15:33 6 hello.txt
```
**ls -l /proc** (procfs, st_mtime == 0, timestamp correctly skipped):
```
dr--r--r-- 0 0/
dr--r--r-- 0 1/
-r--r--r-- 0 cpuinfo
```
**ls -l /dev** (pseudo-devices, st_mtime set to boot time):
```
crw-rw-rw- 2026-06-29 11:21 0 console
crw-rw-rw- 0 rtc0
```
`rtc0` has `st_mtime == 0` so the timestamp is correctly omitted.
Signed-off-by: hanzhijian <[email protected]>
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