毎回ググるのでまとめる
- 最初の検索文字列で分割したい
- 前
${v%%=*}(aa=bb=ccをaaに ) - 後
${v#*=}(aa=bb=ccをbb=ccに )
- 前
- 変数があるときにだけオプション指定
${opt:- --option="$opt" }
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