[jayhemnani9910]

ps -o pid= blanks the header, but the header row is still printed, made of spaces:

$ ps -o pid= -p 1 | od -c
0000000          \n       1      \n
0000007
$ /usr/bin/ps -o pid= -p 1     # procps-ng 4.0.4
      1

So ps -o pid= -p "$pid" | head -1, or a read of the first line, gets an empty line. The procps-ng man page: "If all column headers are empty (ps -o pid= -o comm=) then the header line will not be output." uumain now skips the header row when every mapped header is empty. One named header (-o pid=,ppid) still prints the header line, as in procps-ng. The column padding is unchanged; that is a separate difference.

Tests: test_all_empty_headers_print_no_header_line (-o pid=, -o pid= -o ppid=, and -o pid=,ppid keeping its header) fails without the change. cargo test --workspace: 225 passed in the main test binary (224 on main), the others unchanged; clippy shows the same 7 warnings as main.

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[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.49%. Comparing base (67832aa) to head (8d8e1e5).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/ps/src/ps.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #822      +/-   ##
==========================================
+ Coverage   19.20%   19.49%   +0.29%     
==========================================
  Files          68       68              
  Lines       10156    10242      +86     
  Branches      546      552       +6     
==========================================
+ Hits         1950     1997      +47     
- Misses       8206     8245      +39     

Flag	Coverage Δ
macos_latest	6.74% <0.00%> (-0.01%)	⬇️
ubuntu_latest	19.85% <87.50%> (+0.30%)	⬆️
windows_latest	0.02% <0.00%> (-0.01%)	⬇️

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