Yes, I understand your suggestion but I would like to know what is wrong with the 'test' I'm using there! It's so simple that I can't understand why it's not working!
&& and || control operators examine the exit status last command executed in the list.
If the last command has a zero exit status then a command following && will run:
if the exit status is non-zero then the command following || will run:
This is fairly straight forward so far. However when you string 2 control operators together like this:
The exist status of the test is non-zero so echo no is executed. Following this the exit status of echo no is examined and found to be zero so echo yes is then executed.
For this reason I avoid stringing && and || control operators together in a single command line.
I don't mind stringing multiple && control operators together, this has the effect of continuing executing of each command as long as it's predecessor succeeds: --- Post updated at 01:07 PM ---
As a side note I'd like to discuss the code presented by Stomp earlier:
This works as intended because the command in the middle will always succeed (return a zero exit status) so the end command is not executed.
However, I feel this is a small time bomb waiting for someone to come along later, and because it isn't directly obvious that the execution of the 3rd command is dependent on the exit status of the 2nd (not the original test as many could assume) they change the 2nd command.
Example:
The above grep is just an illustration, any other command that has the potential to return a non-zero value would break the original intent.
This User Gave Thanks to Chubler_XL For This Post:
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