Download Shell scripting: -z and -n options with if - Unix & Linux Stack Exchange book pdf free download link or read online here in PDF. Read online Shell scripting: -z and -n options with if - Unix & Linux Stack Exchange book pdf free download link book now. All books are in clear copy here, and all files are secure so don't worry about it. This site is like a library, you could find million book here by using search box in the header.
You can find a very nice reference for bash's [aka test builtin's operators here, or by running help test in a bash shell or info bash test or info bash '[' from any shell¹. If you are using a different shell, just search for the description of its [ or test builtin in its documentation of if it doesn't have such a builtin², in the man page ...
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