CNIT 340 Debugging

there are never errors in scripts as they are develped (t/f)

so f*cking false, if u said true im afraid you have a lying problem

when an error is encountered, the script can error out (t/f)

true (pls tell me this question is on the exam)

a partially completed or misbehaving script can cause damage to a system/data (t/f)

true

what is best practice for scripts?

test it before deploying

what should the first line of code be in a bash script?

#! /bin/bash

what is the best way to debug a new or unknown script?

#! /bin/bash -xv

what is the default debug option?

none

the set command is not useful for debuggin in bash (t/f)

false, it is useful and can be used

how would you turn debugging on using the 'set' command?

set -n; ; set +n

what does -n mean in regard to the 'set' command?

debugging is on

what does +n mean in regard to the 'set' command?

debugging is off

what does -n stand for?

no execute

what does -n do?

reads every line, but does not execute them

the -n flag also does syntax checking (t/f)

true

the -n flag will explain the exact error and where it is (t/f)

false, it will indiciate if syntax is present, but not the exact error

what is the -v debug option?

verbose mode

what does the -v debug option do?

displays lines as the script reads them

the -v debug option can be combined with others (t/f)

true

what is the -nv debug option?

no exec verbose

what does the -nv debug option do?

copies every line to stdout as it is read, even if there are no errors

what does the -nv debug option do for execution?

it does nothing, does not execute

what is the -x debug option?

shell tracing (dispaly commands and arguments as executed)

lines listed in -x with no '+' are the command result lines sent to ___

stdout

what is a quick way to enable debugging in a script is through ___

debugging hook function

what does a debugging hook function use to determine if debugging is enabled?

environment variable

the debugging hook is useful for initial testing and deployment (t/f)

true