The first option to mention is probably the most useful too – the xtrace option. So there are a few built-in debugging options we can use to see what is going wrong. When writing shell scripts, the programming logic tends to be shorter and is often contained within a single file.
BASH SCRIPT DEBUGGER HOW TO
They may be implemented as a short function that shows the timing, line number and such, or something like this: $ echo "function_name(): value of \\$var is $" How to use Bash xtrace option Assertions can pinpoint even the subtlest of bugs. These are basically a ways of explicitly asserting conditions or the state of things at a point in time. There are techniques used in traditional programming environments that can be useful with complex Bash scripts, such as using assertions. Some programming languages come with companion debugging environments, like gcc and gdb that let you step through code, set breakpoints, examine the state of everything at those points in the execution and more – but there’s generally less need for a heavy handed approach like that with shell scripts since the code is simply interpreted instead of being compiled into binaries. Simply having syntax highlighting will allow you to catch mistakes as you write the code, saving you the time-consuming task of tracking down mistakes later. It’s no different when writing Bash scripts. Programmers have traditionally taken advantage of tools like debuggers and syntax highlighting in editors to assist them. $ – requires given linux commands to be executed as a regular non-privileged userĭebugging code can be tricky, even if the mistakes are simple and obvious.
# – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command Requirements, Conventions or Software Version Used – Brian Kernighan, “Unix for Beginners” (1979) Software Requirements and Conventions Used Software Requirements and Linux Command Line Conventions Category The most effective debugging tool is still careful thought, coupled with judiciously placed print statements.
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