A.declare-a变量名
B.declare-f变量名
C.typeset-r变量名
D.typeset-i变量名
A.${abrr}
B.${abrr[*]}
C.${abrr[*]
D.${abrr[@]}
A.${stra:-word}
B.${stra:=word}
C.${stra:+word}
D.${stra:?word}
A.${stra-word}
B.${stra=word}
C.${stra:+word}
D.${stra:?word}
A.${strapattern}
B.${strapattern}
C.${stra%pattern}
D.${stra%%pattern}
A.read
B.set
C.shift
D.expo
A.test表达式
B.let算术表达式
C.((算术表达式))
D.$((算术表达式))
A.-E
B.-S
C.-c
D.-o
A.-Wall
B.-Werror
C.-w
D.-g
A.-Lpath
B.-Ipath
C.-llibrary
D.-static
A.open()
B.read()
C.write()
D.close()
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