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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 ``` ``````#!/bin/sh   test_description='common tail optimization'   . ./test-lib.sh   z=zzzzzzzz ;# 8 z="\$z\$z\$z\$z\$z\$z\$z\$z" ;# 64 z="\$z\$z\$z\$z\$z\$z\$z\$z" ;# 512 z="\$z\$z\$z\$z" ;# 2048 z2047=\$(expr "\$z" : '.\(.*\)') ; #2047   x=zzzzzzzzzz ;# 10 y="\$x\$x\$x\$x\$x\$x\$x\$x\$x\$x" ;# 100 z="\$y\$y\$y\$y\$y\$y\$y\$y\$y\$y" ;# 1000 z1000=\$z z100=\$y z10=\$x   zs() { count="\$1" while test "\$count" -ge 1000 do count=\$((\$count - 1000)) printf "%s" \$z1000 done while test "\$count" -ge 100 do count=\$((\$count - 100)) printf "%s" \$z100 done while test "\$count" -ge 10 do count=\$((\$count - 10)) printf "%s" \$z10 done while test "\$count" -ge 1 do count=\$((\$count - 1)) printf "z" done }   zc () { sed -e "/^index/d" \ -e "s/\$z1000/Q/g" \ -e "s/QQQQQQQQQ/Z9000/g" \ -e "s/QQQQQQQQ/Z8000/g" \ -e "s/QQQQQQQ/Z7000/g" \ -e "s/QQQQQQ/Z6000/g" \ -e "s/QQQQQ/Z5000/g" \ -e "s/QQQQ/Z4000/g" \ -e "s/QQQ/Z3000/g" \ -e "s/QQ/Z2000/g" \ -e "s/Q/Z1000/g" \ -e "s/\$z100/Q/g" \ -e "s/QQQQQQQQQ/Z900/g" \ -e "s/QQQQQQQQ/Z800/g" \ -e "s/QQQQQQQ/Z700/g" \ -e "s/QQQQQQ/Z600/g" \ -e "s/QQQQQ/Z500/g" \ -e "s/QQQQ/Z400/g" \ -e "s/QQQ/Z300/g" \ -e "s/QQ/Z200/g" \ -e "s/Q/Z100/g" \ -e "s/000Z//g" \ -e "s/\$z10/Q/g" \ -e "s/QQQQQQQQQ/Z90/g" \ -e "s/QQQQQQQQ/Z80/g" \ -e "s/QQQQQQQ/Z70/g" \ -e "s/QQQQQQ/Z60/g" \ -e "s/QQQQQ/Z50/g" \ -e "s/QQQQ/Z40/g" \ -e "s/QQQ/Z30/g" \ -e "s/QQ/Z20/g" \ -e "s/Q/Z10/g" \ -e "s/00Z//g" \ -e "s/z/Q/g" \ -e "s/QQQQQQQQQ/Z9/g" \ -e "s/QQQQQQQQ/Z8/g" \ -e "s/QQQQQQQ/Z7/g" \ -e "s/QQQQQQ/Z6/g" \ -e "s/QQQQQ/Z5/g" \ -e "s/QQQQ/Z4/g" \ -e "s/QQQ/Z3/g" \ -e "s/QQ/Z2/g" \ -e "s/Q/Z1/g" \ -e "s/0Z//g" \ ; }   expect_pattern () { cnt="\$1" cat <file-a\$n && ( echo b; zs \$n; echo ) >file-b\$n && ( printf c; zs \$n ) >file-c\$n && ( echo d; zs \$n ) >file-d\$n &&   git add file-a\$n file-b\$n file-c\$n file-d\$n &&   ( zs \$n ; echo A ) >file-a\$n && ( echo B; zs \$n; echo ) >file-b\$n && ( printf C; zs \$n ) >file-c\$n && ( echo D; zs \$n ) >file-d\$n &&   expect_pattern \$n || break   done >expect '   test_expect_success 'diff -U0' '   for n in \$sample do git diff -U0 file-?\$n done | zc >actual && test_cmp expect actual   '   test_done  ``````