Shell Programming and Scripting

i have a script that has 6 functions and 300 lines of code.

I am using bash shell.

Code:

 uname -a
SunOS mymac 5.11 11.2 sun4v sparc sun4v

The requirement i have is that the script should stop execution and exit as soon as even a single line of code fails. It should also display which particular line of code failed and in which function.

In the shebang shell there is this option while falls short of my requirement.

And in which way does it do that? Sounds pretty much like your requirement in my ears.

bakunin

How do i display the line of the script that failed??

Use the PS4 prompt to display the internal variables BASH_LINENO and probably BASH_SOURCE. See man bash for details.

I hope this helps.

bakunin

One of the functions in my script looks like the below.

Code:

#!/bin/bash -e
export PS4='$0.$BASH_LINENO+ '
echo "demo script"
ls -l /etc/ | wc -l
du -sh ~
grep er tpm.txt
echo i m good

What do i do to display the line number that failed ?

i tried adding export PS4='$0.$LINENO+ ' but it does not help nor i m any sure what needs to be done.

Call bash with the "-x" flag. bash (as well as ksh) will display every (debug-)line preceeded by the PS4 prompt in this case.

I hope this helps.

bakunin

No ... i just wish to display the failing line ... along with the line number thats it... not the entire debug.

The sole and whole purpose is to Alert the caller which could be on a remote system calling this script using ansible or ssh know what line failed .