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	jbond
	Dec 30 2019, 10:45 AM

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raw.txt
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	$ cat t.sh
	#=!/bin/sh
	set -x
	FETCH_HEAD_OR_EMPTY=$([ -z "${1:-}" ] \|\| echo FETCH_HEAD)
	printf 'HERE %s\n' "${FETCH_HEAD_OR_EMPTY}"
	FETCH_HEAD_OR_EMPTY=${1:-FETCH_HEAD}
	printf 'HERE %s\n' "${FETCH_HEAD_OR_EMPTY}"
	$ ./t.sh
	+ [ -z ]
	+ FETCH_HEAD_OR_EMPTY=
	+ printf HERE %s\n
	HERE
	+ FETCH_HEAD_OR_EMPTY=FETCH_HEAD
	+ printf HERE %s\n FETCH_HEAD
	HERE FETCH_HEAD
	$ ./t.sh foo
	+ [ -z foo ]
	+ echo FETCH_HEAD
	+ FETCH_HEAD_OR_EMPTY=FETCH_HEAD
	+ printf HERE %s\n FETCH_HEAD
	HERE FETCH_HEAD
	+ FETCH_HEAD_OR_EMPTY=foo
	+ printf HERE %s\n foo
	HERE foo