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Full Discussion: Check the value of a variable
Top Forums Shell Programming and Scripting Check the value of a variable Post 302619991 by Corona688 on Friday 6th of April 2012 05:53:07 PM
Old 04-06-2012
Consider [ ] as programs, not brackets, to understand how their syntax works. "[-n" is not the same program as "[" "-n".

You need spaces.

Code:
if [ -n "$var" ]
then
...
fi

 

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LEARN ABOUT DEBIAN

naturaldocs

NATURALDOCS(1)						      General Commands Manual						    NATURALDOCS(1)

NAME

       NaturalDocs - an extensible, multi-language documentation generator

SYNOPSIS

       naturaldocs -i <input (source) directory> [-i <input (source) directory> ...] -o <output format> <output directory> [-o <output format>
       <output directory> ...] -p <project directory> [options]

DESCRIPTION

       This manual page documents briefly the .B naturaldocs command. Note that naturaldocs is a wrapper script that on Debian	invokes  the  real
       NaturalDocs perl program. So, the real, original name of the program is NaturalDocs but on Debian systems you invoke it as naturaldocs.

       Natural	Docs  is  is  an  open-source, extensible, multi-language documentation generator. You document your code in a natural syntax that
       reads like plain English. Natural Docs then scans your code and builds high-quality HTML documentation from it.

OPTIONS

       A summary of options, extracted from the help printed by the -h switch is included below.  For a complete description  of  how  NaturalDocs
       works, see the text files in the /usr/share/doc/naturaldocs directory.

       Required parameters:

       -i, --input, --source DIR
	      Specifies an input (source) directory. Required.
	      Can be specified multiple times.

       -o, --output FMT DIR
	      Specifies an output format and directory. Required.
	      Can be specified multiple times, but only once per directory. Possible output formats are HTML and FramedHTML.

       -p, --project DIR
	      Specifies the project directory. Required.
	      There needs to be a unique project directory for every source directory.

       Optional parameters:

       -s, --style STYLE [STYLE ...]
	      Specifies the CSS style when building HTML output. If multiple styles are specified, they will all be included in the order given.

       -img, --image DIR
	      Specifies an image directory. Can be specified multiple times. Start with * to specify a relative directory, as in -img */images.

       -do, --documented-only
	      Specifies only documented code aspects should be included in the output.

       -t, --tab-length LEN
	      Specifies  the  number of spaces tabs should be expanded to. This only needs to be set if you use tabs in example code and text dia-
	      grams. Defaults to 4.

       -xi, --exclude-input, --exclude-source
	      Excludes an input (source) directory from the documentation. Automatically done for the project and output directories. Can be spec-
	      ified multiple times.

       -nag, --no-auto-group
	      Turns off auto-grouping completely.

       -oft, --only-file-titles
	      Source files will only use the file name as the title.

       -r, --rebuild
	      Rebuilds all output and data files from scratch. Does not affect the menu file.

       -ro, --rebuild-output
	      Rebuilds all output files from scratch.

       -q, --quiet
	      Suppresses all non-error output.

       -?, -h, --help
	      Displays syntax reference.

AUTHOR

       NaturalDocs was written by Greg Valure <gregvalure@naturaldocs.org>.

       This manual page was written by Federico Di Gregorio <fog@debian.org>, for the Debian project (but may be used by others).

								     May 2007							    NATURALDOCS(1)
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