To debug a shell script use set –xv inside the shell script at the top.
Shell script with no debug command:
$ cat filesize.sh
#!/bin/bash
for filesize in $(ls -l . | grep "^-" | awk '{print $5}')
do
let totalsize=$totalsize+$filesize
done
echo "Total file size in current directory: $totalsize"
Output of Shell script with no debug command:
$ ./filesize.sh Total file size in current directory: 652
Shell script with Debug command inside:
Add set –xv inside the shell script now to debug the output as shown below.
$ cat filesize.sh
#!/bin/bash
set -xv
for filesize in $(ls -l . | grep "^-" | awk '{print $5}')
do
let totalsize=$totalsize+$filesize
done
echo "Total file size in current directory: $totalsize"
Output of Shell script with Debug command inside:
$ ./fs.sh
++ ls -l .
++ grep '^-'
++ awk '{print $5}'
+ for filesize in '$(ls -l . | grep "^-" | awk '\''{print $5}'\'')'
+ let totalsize=+178
+ for filesize in '$(ls -l . | grep "^-" | awk '\''{print $5}'\'')'
+ let totalsize=178+285
+ for filesize in '$(ls -l . | grep "^-" | awk '\''{print $5}'\'')'
+ let totalsize=463+189
+ echo 'Total file size in current directory: 652'
Total file size in current directory: 652
Execute Shell script with debug option:
Instead of giving the set –xv inside the shell script, you can also provide that while executing the shell script as shown below.
$ bash -xv filesize.sh
Comments on this entry are closed.
Dear Sir / Madam,
Its realy very helpful to me to know the advanced LINUX Command and scripts. from our web site…
Thanks
Prof. Mr. MARIMUKTU
Dept. Of Computer Science,
ASC College CHOPDA.
I found all the things were exiting. Especially this debugging was super.
It is useful in many situations and helped me a lot.
i really love to be an hacker to and i love to know more about this linux
Thanks,
These are really beneficial for me…but i have some doubts .. and how can i suscribe this.
#!/bin/bash -xv
echo “Hello world”
would do the same thing.