Bash版本> 4.1确实提供了不同的解决方案：BASH_XTRACEFD环境变量允许您指定将用于发送调试流的文件描述符.这可以是文件或管道或任何其他你喜欢的unix-y善良.

# Use FD 19 to capture the debug stream caused by "set -x":
exec 19>/tmp/my-script.log
# Tell bash about it  (there's nothing special about 19,its arbitrary)
export BASH_XTRACEFD=19

# turn on the debug stream:
set -x

# run some commands:
cd /etc
find 
echo "Well,that was fun."

# Close the output:
set +x
exec 19>&-

# See what we got:
cat /tmp/my-script.log

稍微摆弄一下,你可以做其他的事情 – 比如在stdout和/或stdin流上做’tee’,然后用调试输出交错,这样你的日志就更完整了.有关详细信息,请参阅https://stackoverflow.com/questions/3173131/redirect-copy-of-stdout-to-log-file-from-within-bash-script-itself.

这种方法相对于替代方案的最大优点是,通过将调试输出注入stdout或stderr,您不会冒险更改脚本的行为.