34 lines
1.1 KiB
Plaintext
Executable File
34 lines
1.1 KiB
Plaintext
Executable File
# First try some invalid patterns. Do in subshell due to parsing error.
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# (set argv0 to "SHELL" to avoid "/path/to/shell: blah" in error messages)
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"$THIS_SH" -c 'echo ${+} ; echo moo' SHELL
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"$THIS_SH" -c 'echo ${:+} ; echo moo' SHELL
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# now some funky ones.
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# ${V+word} "if V unset, then substitute nothing, else substitute word"
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# ${V:+word} "if V unset or '', then substitute nothing, else substitute word"
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#
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# ${#:+} is a :+ op on $#, but ${#+} (and any other ${#c}) is "length of $c",
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# not + op on $#.
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# bash and dash do not accept ${#+}. it's possible for some shell to skip
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# the check that c is valid and interpret ${#+} as "len of $+". Not testing it.
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# echo _${#+}_
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echo _${#:+}_
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# Forms with non-empty word work as expected in both ash and bash.
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echo _${#+z}_ _${#:+z}_
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# now some valid ones
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set --
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echo _$1 _${1+} _${1:+} _${1+word} _${1:+word}
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set -- aaaa
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echo _$1 _${1+} _${1:+} _${1+word} _${1:+word}
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unset f
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echo _$f _${f+} _${f:+} _${f+word} _${f:+word}
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f=
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echo _$f _${f+} _${f:+} _${f+word} _${f:+word}
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f=fff
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echo _$f _${f+} _${f:+} _${f+word} _${f:+word}
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