I have a Postgres console command createdb appname_production_master, which return error exit code if the database with this name already exists.
Is it possible to make this command do not return any exit code?
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2 Answers
Just ignore the exit code, for example like this.
createdb appname_production_master || true
2 Comments
Ben Voigt
Strictly speaking, this doesn't ignore the exit code, but it uses it in an expression that always succeeds.
killthrush
"<<command>> || :" is another form that seems to work, where the colon is the null command that always succeeds
Unix commands always return exit codes, but you need not respond to the exit code.
When you run a command $? is set to the exit code of the process. As this happens for every command, simply running a different command after the first will change $?.
For example:
createdb appname_production_master # returns 1, a failure code
# $? is 1
/bin/true # always returns 0, success
# $? is 0
Here's another example:
/bin/false # returns false, I assume usually 1
echo $? # outputs 1
echo $? # outputs 0, last echo command succeeded
