anchao opened a new pull request, #2885:
URL: https://github.com/apache/nuttx-apps/pull/2885

   ## Summary
   
   nshlib/[cd|ls|pwd]: add support for local CWD(Current working directory)
   
   This PR will still allow basic shell operations such as cd/ls/pwd to be used 
even when the environment is disabled.
   
   Signed-off-by: chao an <anc...@lixiang.com>
   
   ## Impact
   
   Depends on: https://github.com/apache/nuttx/pull/15120
   
   ## Testing
   
   sim/nsh  and enable  CONFIG_DISABLE_ENVIRON
   
   before:
   ```
   $ ./build/nuttx 
   
   NuttShell (NSH) NuttX-10.4.0
   nsh> ls
   nsh: ls: missing required argument(s)
   nsh> cd
   nsh: cd: command not found
   nsh> pwd
   nsh: pwd: command not found
   nsh> ls /
   /:
    bin/
    data/
    dev/
    etc/
    proc/
    tmp/
   nsh> 
   ```
   after:
   
   
   ```
   $ ./build/nuttx 
   
   NuttShell (NSH) NuttX-10.4.0
   nsh> ls
   /:
    bin/
    data/
    dev/
    etc/
    proc/
    tmp/
   nsh> cd
   nsh> cd /data
   nsh> pwd
   /data
   nsh> ls /
   /:
    bin/
    data/
    dev/
    etc/
    proc/
    tmp/
   nsh> 
   
   ```


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