How to debug Linux shell scripts

Shell also has a real debugging mode. If an error occurs in the script "strangescript", you can debug it as follows:

Sh-x strangescript

This will execute the script and display the values of all variables.

Shell also has a mode that only checks the syntax without executing the script. It can be used as follows:

Sh-n your_script

This will return all syntax errors.

Linux/unix shell l script debugging method

Shell provides some options for script debugging, as shown below:

-N
Read the commands in the script but do not execute them. It is used to check the syntax errors in the script.

-V
Execute the script and print the executed script command to the standard error output.

-X
Provides trace execution information to print each command and result in sequence.

There are three methods to use these options. One is to provide parameters in the command line.

$ Sh-x./script. sh 2. Provide parameters at the beginning of the script

#! /Bin/sh-x the third method is to use the set command in the script to enable or disable parameters.

Copy codeThe Code is as follows :#! /Bin/sh
If [-z "$1"]; then
Set-x
Echo "ERROR: Insufficient Args ."
Exit 1
Set + x

Fiset-x and set + x indicate enable and disable the-x parameter, respectively, so that you can trace and debug only a part of the script.