Shell Script debugging

1.sh-x Script
This executes the script and displays the values of all variables

For example, script:

#!/bin/bash#a test about shiftif$#0 ]thenecho"there is no parameters"exit0fisum=0while$#-gt0 ]do  $sum$1`  shiftdoneecho$sum

Output:

2.sh-n Script
Do not execute script, just check syntax mode, will return all syntax errors

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Shell Script debugging