set -e in Bash scripts: discovering failure location?

Question

As we all know, we should use set -e to make Bash scripts more robust . However, with this enabled, if the script does fail, is there any way to get Bash to report which line of the script failed? At the moment, I'm having to re-run the script with a load of echo commands.

Answer 1

The best option I'm aware of for debugging with line numbers is to customise the " + " prefix printed by set -x to include $LINENO .

eg at the top of your script:

PS4='($LINENO)+ '
set -x

(Not exactly what you asked for, but it is handy!)

Answer 2

您可以使用bash -x重新运行（或者在脚本中set -x以激活调试， set +x以便稍后停用它）

Answer 3

不确定行号，但如果将-e（或-u）与-v组合使用，则会在屏幕上打印最后一行时出现错误发生的行。