bash - GNU Bourne-Again SHell. Bash is an sh-compatible command language interpreter that executes commands read from the standard input or from a file. Bash also incorporates useful features from the Korn and C shells (ksh and csh).
-x parameter puts bash into debug mode, so if you would like to execute your bash script in debug mode, you can do it this way:
# bash -x yourscriptname.sh
another solution is to add "set -x" line into your script, but you have to remember that this will make your script produce debug output every time it's executed. If you prefer this way, just add "set -x" line at the begining of script: