bash脚本将set -x的输出副本复制到文件，从脚本内部调用而不是使用tee

Question

I am wondering if there is a way to write set -x output to a file from within a script, rather than call a tee from the command prompt.

For example, I usually use myScript.sh 2>&1 | tee mylog.log myScript.sh 2>&1 | tee mylog.log form the command prompt. This copies the set -x as I expect to the log file.

Is there a way to internalise this within myScript.sh so I can set it as a flag to be turned off if I do not need to debug. running only myScript.sh from the command prompt.

thx Art

Answer 1

Inside your script place this line at top:

#!/bin/bash

[[ $1 == "debug" ]] && { exec 2>err.txt; set -x; }

# rest of the script

Now when you call your script as:

./myScript.sh debug

You will get a file created as err.txt containing output of set -x (with other error, if any)