lint: improve coding style of shell scripts

[JacksonTian]

You need to complete

• [x] unit tests and/or feature tests
• [ ] documentation is changed or added

[codecov[bot]]

Codecov Report

Merging #507 (4bc50a3) into master (e82b3b8) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 4bc50a3 differs from pull request most recent head 59f7834. Consider uploading reports for the commit 59f7834 to get more accurate results

@@           Coverage Diff           @@
##           master     #507   +/-   ##
=======================================
  Coverage   95.92%   95.92%           
=======================================
  Files          45       45           
  Lines        1916     1916           
  Branches      276      276           
=======================================
  Hits         1838     1838           
  Misses         56       56           
  Partials       22       22