How to debug shell script?

How to debug Shell script? We can debug the shell script using the "set-xv" command in the shell script or using -xv on the command line while executing the script.

Debug the shell script by adding the command:

$ cat checkdebug.sh

#!/bin/bash

set -xv  #<< This will enable debugcd /var/log/
for i in "*.log"; do
 du -sh $i
done

Execute the above script and observe the output:

#sh checkdebug.sh

Output:

cd /var/log/
+ cd /var/log/
for i in "*.log"; do
 du -sh $i
done
+ for i in '"*.log"'
+ du -sh boot.log mysqld.log post111.log post1121.log yum.log
0       boot.log
32K     mysqld.log
0       post111.log
0       post1121.log
4.0K    yum.log

Debug shell script using option:

With this option, we don’t need to add “set-xv” in the shell script. Just create a shell script as shown below.

$ cat checkdebug2.sh
#!/bin/bash

cd /var/log/
for i in "*.log"; do
 du -sh $i
done

The execution is as follows

# sh -xv checkdebug2.sh

Output:

#!/bin/bash
cd /var/log/
+ cd /var/log/
for i in "*.log"; do
 du -sh $i
done
+ for i in '"*.log"'
+ du -sh boot.log mysqld.log post111.log post1121.log yum.log
0       boot.log
32K     mysqld.log
0       post111.log
0       post1121.log
4.0K    yum.log

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