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echo ff{c,b,a}
echo f{d,e,f}g
echo {l,n,m}xyz
echo {abc\,def}
echo {abc}
echo \{a,b,c,d,e}
echo {x,y,\{a,b,c}}
echo {x\,y,\{abc\},trie}
echo /usr/{ucb/{ex,edit},lib/{ex,how_ex}}
echo XXXX\{`echo a b c | tr ' ' ','`\}
eval echo XXXX\{`echo a b c | tr ' ' ','`\}
echo {}
echo { }
echo }
echo {
echo abcd{efgh
echo foo {1,2} bar
echo `zecho foo {1,2} bar`
echo $(zecho foo {1,2} bar)
var=baz
varx=vx
vary=vy
echo foo{bar,${var}.}
echo foo{bar,${var}}
echo "${var}"{x,y}
echo $var{x,y}
echo ${var}{x,y}
unset var varx vary
# new sequence brace operators
echo {1..10}
# this doesn't work yet
echo {0..10,braces}
# but this does
echo {{0..10},braces}
echo x{{0..10},braces}y
echo {3..3}
echo x{3..3}y
echo {10..1}
echo {10..1}y
echo x{10..1}y
echo {a..f}
echo {f..a}
echo {a..A}
echo {A..a}
echo {f..f}
# mixes are incorrectly-formed brace expansions
echo {1..f}
echo {f..1}
echo 0{1..9} {10..20}
# do negative numbers work?
echo {-1..-10}
echo {-20..0}
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