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@ -178,7 +178,7 @@ DIR=${SRC%$BASE} #=> "/path/to" (dirpath)
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| `${FOO:-val}` | `$FOO`, or `val` if not set |
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| `${FOO:=val}` | Set `$FOO` to `val` if not set |
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| `${FOO:+val}` | `val` if `$FOO` is set |
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| `${FOO:?message}` | Show error message ande xit if `$FOO` is not set |
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| `${FOO:?message}` | Show error message and exit if `$FOO` is not set |
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The `:` is optional (eg, `${FOO=word}` works)
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