回答編集履歴
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追記
test
CHANGED
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@@ -9,3 +9,93 @@
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awk -F " *[=,] *" '{delete n; printf "%s=%s", $1,$2; n[$2]=1; for(i=3;i<=NF;i++){n[$i]++; if(n[$i]<=1) printf ",%s",$i;} printf "\n"}' hoge.bak > hoge
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```
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# 追記
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だいぶん話が違っていたことがわかってきたので、改めて。
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hoge.txt
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```
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# aaaaa = t11111,t22222,t33333,t44444,t55555
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aaaaa = t11111,t22222,t33333,t44444,t55555
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bbbbb = t11111,t22222,t33333,t44444,t55555
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ccccc = t11111,t22222,t33333,t44444,t11111,t22222,t99999
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```
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test.awk
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```
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BEGIN{
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FS = " *[=,] *";
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}
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/^#/{
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sub(/^# */, "", $1);
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printf "%s=\n", $1;
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next;
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}
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{
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delete n;
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printf "%s=%s", $1, $2;
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n[$2]=1;
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for(i=3; i<=NF; i++){
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n[$i]++;
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if(n[$i]<=1) printf ",%s", $i;
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}
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printf "\n";
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}
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```
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実行
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```
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$ awk -f test.awk hoge.txt
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aaaaa=
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aaaaa=t11111,t22222,t33333,t44444,t55555
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bbbbb=t11111,t22222,t33333,t44444,t55555
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ccccc=t11111,t22222,t33333,t44444,t99999
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```
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