How to implement Linux Shell script debugging
This article mainly explains "how to achieve Linux Shell script debugging", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "how to achieve Linux Shell script debugging" bar!
Debug script
Debugging function is one of the important features that every programming language should implement. When something unexpected happens, use it to generate the running information of the script. Debugging information can help you figure out what causes the program to crash or behave abnormally.
II. Built-in debugging function of Bash
Using the built-in debugging feature of Bash, you can debug the entire script or only some statements in the script.
# use set-x and set + x to debug a sentence of the script
The code is as follows:
#! / bin/bash
For i in {1 2 3 4 5 6}
Do
Set-x # enables debugging
Echo $I # statements to debug
Set + x # turns off debugging
Done
Echo "Script executed."
The code is as follows:
# debug the entire script using the-x option
Bash-x script.sh # is equivalent to sh-x script.sh
III. Custom debugging functions
Bash's built-in debugging function can only output debugging information in a fixed format, but in many cases, we need to display debugging information in a custom format, which can be established through the _ DEBUG environment variable.
The code is as follows:
# run the following script using _ DEBUG=on bash script.sh
#! / bin/bash
Function DEBUG ()
{
["$_ DEBUG" = = "on"] & & $@ | |: # debug using the _ DEBUG environment variable
}
For i in {1 2 3}
Do
DEBUG echo $I
Done
We DEBUG in front of every statement that needs to print debug information, and if we don't pass a script to _ DEBUG=on, the debug information won't be printed. In Bash,: tell shell not to do anything.
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