return code help

learnbash · #1 (**permalink**) 02-10-2009

Hello folks,

I have a question that if i type ls command and type echo $? it always show "0", how i could do this change that when i type ls it will show me 1, actually i want to change the return code of commands from 0 to 1.

Thanks
Bash

vgersh99 · #2 (**permalink**) 02-10-2009

Code:

bash-2.05$ ls foo
foo: No such file or directory
bash-2.05$ echo $?
2

learnbash · #3 (**permalink**) 02-10-2009

Quote:

Originally Posted by vgersh99

Code:

bash-2.05$ ls foo
foo: No such file or directory
bash-2.05$ echo $?
2

Hello,

thanks for your reply, but i want to replace only true output to "1", ls always return "0" how could i replace only ls command output to "1".

Thanks,
Bash

vgersh99 · #4 (**permalink**) 02-10-2009

Quote:

Originally Posted by learnbash

Hello,

thanks for your reply, but i want to replace only true output to "1", ls always return "0" how could i replace only ls command output to "1".

Thanks,
Bash

no, 'ls' does not always return '0'.
here's what 'man ls' yields:

Code:

EXIT STATUS
     0     All information was written successfully.

     >0    An error occurred.

just curious, why would you want to return a non-zero value when 'ls' was successful?

learnbash · #5 (**permalink**) 02-10-2009

Quote:

Originally Posted by vgersh99

no, 'ls' does not always return '0'.
here's what 'man ls' yields:

Code:

EXIT STATUS
     0     All information was written successfully.

     >0    An error occurred.

just curious, why would you want to return a non-zero value when 'ls' was successful?

Hello,

Thanks once again for quick reply, i understand what you are saying actually i want to make all commands return code to "1", ls is just an example.

Thanks.
Bash

pludi · #6 (**permalink**) 02-10-2009

Why? It's common practice in UNIX for programs to return 0 on successful exit (yes, I know it's different to C, where non-zero indicates success). If you want to change that, have fun updating and recompiling almost every util and shell for your OS.

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
Need help with return code 1...	mac4rfree	Shell Programming and Scripting	6	12-11-2008 11:47 AM
FTP Return Code	wilsonSurya	UNIX for Dummies Questions & Answers	1	10-06-2008 08:27 AM
to pick up the Return Code ( RC) from the mailx command and return it to SAS uisng 's	manas6	UNIX for Dummies Questions & Answers	0	06-05-2008 07:44 AM
asking about return code	naamas03	Shell Programming and Scripting	3	08-28-2007 05:53 AM
Return Code of tar in AIX	dupeng	AIX	3	02-23-2004 12:05 AM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by