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(PATH=subdir$PATH_SEPARATOR$PATH; export PATH; exec program)
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$ false || foo=bar; echo $? 1 $ false || foo=`:`; echo $? 0
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$ foo=`exit 1`; echo $? 0
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: ${var='my literal'}
: ${var="$default"}
var=${var="$default"}
test "${var+set}" = set || var='${indirection}'
¤Û¤È¤ó¤É¤Î¾ì¹ç¡¤‘var=${var="$default"}’¤ÇÎɤ¤¤Î¤Ç¤¹¤¬¡¤ÂÌÌܤʤȤ ¤Ï¸å¼Ô¤ò»ÈÍѤ·¤Æ¤¯¤À¤µ¤¤¡¥ÀµÅöÀ¤Î¤¿¤á¤Î¡¤ ‘${var:-value}’¤È‘${var=value}’ ¤Î ¹àÌܤϡ¤See Shell Substitutions.