bashlib: avoid activating set -x

[bertsky]

Fix #534

[codecov-commenter]

Codecov Report

Merging #535 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #535   +/-   ##
=======================================
  Coverage   80.43%   80.43%           
=======================================
  Files          45       45           
  Lines        2785     2785           
  Branches      544      544           
=======================================
  Hits         2240     2240           
  Misses        442      442           
  Partials      103      103           

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