Added manpage

arg.1

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+.\" Manpage for arg.
+.\" Contact bruce@bruce-hill.com to correct errors or typos.
+.TH man 8 "14 February 2019" "1.0" "arg man page"
+.SH NAME
+arg \- A minimalist command line argument parser
+.SH SYNOPSIS
+.B arg
+.I flag
+.I ...
+.SH DESCRIPTION
+This is a handy tool for parsing out a single argument from a list of command
+line arguments.
+
+.SH INPUT
+The first argument must be a flag (for example \fB-f\fR, \fB--foo\fR, or
+\fBfoo\fR). This flag will be searched for among the remaining arguments.
+
+.SH OUTPUT AND RETURN
+If the flag is found, the program will exit successfully (exit status 0),
+otherwise the program will fail (exit status 1). A flag is found if:
+
+.RS 4
+.HP 2
+\fB-\fR one of the extra arguments is an exact match:
+\fBarg --foo .. \fI--foo\fB [<value>]\fR
+
+.HP 2
+\fB-\fR one of the exact arguments begins with the flag followed by an '=' sign:
+\fBarg --foo .. \fI--foo=\fB[<value>]\fR
+
+.HP 2
+\fB-\fR or the flag is a single dash followed by a single letter, and the letter
+is found clustered with other letters after a single dash:
+\fBarg -f .. -x\fIf\fBy\fR
+
+If a value is found, the value is printed to stdout.
+
+.RE
+
+.SH EXAMPLES
+The primary use case of this program is for shell scripting, as a much simpler
+and easier to use alternative to getopt. Here are some simple shell script
+examples:
+
+.TP
+.B
+if foo=`arg --foo "$@"`; then echo "foo is '$foo'"; fi
+If \fI--foo=value\fR or \fI--foo value\fR are in the arguments, the shell script
+will print "foo is 'value'".
+
+Note: it is important to put quotes around \fB$@\fR to ensure that
+arguments with spaces get passed correctly.
+
+.TP
+.B
+if arg -v "$@" || arg --verbose "$@"; then echo "Verbose!"; fi
+Prints "Verbose!" if the shell script was run with either \fI-v\fR or \fI--verbose\fR.
+
+.TP
+.B
+prefix=`arg prefix "$@" || echo "/usr/local"`
+Sets prefix to the value of the \fIprefix\fR flag the user pased in, or if
+no such flag was passed, \fI/usr/local\fR.
+
+.SH AUTHOR
+Bruce Hill (bruce@bruce-hill.com)