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sed 在最后一次出现大括号之前添加换行符？

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sed 在最后一次出现大括号之前添加换行符？

我想在最后一次出现的大括号之前插入一个新行。我的文本文件看起来像这样

 "accounts": {
    "0x0000000000000000000000000000000000000008": { "builtin": { "name": "alt_bn128_pairing", "activate_at": "0x0", "pricing": { "alt_bn128_pairing": { "base": 100000, "pair": 80000 } } } },
    "0x00Ea169ce7e0992960D3BdE6F5D539C955316432": { "balance": "1606938044258990275541962092341162602522202993782792835301376" }
 }

所以我想做的是account通过 sed 脚本添加一个新的。

请注意，新帐户将使用变量指定，例如：

"$ACCOUNT_ADDR": { "balance": "1606938044258990275541962092341162602522202993782792835301376" }

答案1

sed是这项工作的错误工具。正确的工具之一是jq.

% 猫 wibble.json
{
“账户”：{
    "0x0000000000000000000000000000000000000008": { "builtin": { "name": "alt_bn128_pairing", "activate_at": "0x0", "pricing": { "alt_bn128_pairing": { "base": 100000, "pair": 8000 0 } } } },
    “0x00Ea169ce7e0992960D3BdE6F5D539C955316432”：{“余额”：“1606938044258990275541962092341162602522202993782792835301376”}
}
}
% ACCOUNT_ADDR="0xdeadbeeffeefdface0badd00dcacad0d0eeeeeeee"
% jq '."账户"."'"${ACCOUNT_ADDR}"'"."余额"="42"' wibble.json
{
  “账户”：{
    “0x0000000000000000000000000000000000000008”：{
      “内置”： {
        “名称”：“alt_bn128_pairing”，
        “activate_at”：“0x0”，
        “价钱”： {
          “alt_bn128_pairing”：{
            “基数”：100000，
            “对”：80000
          }
        }
      }
    },
    “0x00Ea169ce7e0992960D3BdE6F5D539C955316432”：{
      “余额”：“1606938044258990275541962092341162602522202993782792835301376”
    },
    “0xdeadbeeffeefdface0badd00dcacad0d0eeeeeeee”：{
      “余额”：“42”
    }
  }
}
%

它还发现了这样一个事实：您有一个没有封闭对象的键+值对。 ☺

答案2

您可以在“accounts”出现后添加一行，

sed "/accounts/ a\
  \"$ACCOUNT_ADDR\": { \"balance\": \"1606938044258990275541962092341162602522202993782792835301376i\" }
" file

（"转义，插入变量）

sed "s/^ }$/ \"$ACCOUNT_ADDR\": { \"balance\": \"1606938044258990275541962092341162602522202993782792835301376i\" }\n }/g" file

将替换您的}行并打印两行。

循环运行sed -i ...更改文件：

$  cat file
"accounts": {
    "0x0000000000000000000000000000000000000008": { "builtin": { "name": "alt_bn128_pairing", "activate_at": "0x0", "pricing": { "alt_bn128_pairing": { "base": 100000, "pair": 80000 } } } },
    "0x00Ea169ce7e0992960D3BdE6F5D539C955316432": { "balance": "1606938044258990275541962092341162602522202993782792835301376" }
 }

$ cat script.sh
#!/bin/bash

for i in $(seq 1 5); do
  ACCOUNT_ADDR="account_"$i
  sed -i "/accounts/ a\
      \"$ACCOUNT_ADDR\": { \"balance\": \"1606938044258990275541962092341162602522202993782792835301376i\" }
  " file
done

$ ./script.sh
$ cat file
"accounts": {
"account_5": { "balance": "1606938044258990275541962092341162602522202993782792835301376i" }
"account_4": { "balance": "1606938044258990275541962092341162602522202993782792835301376i" }
"account_3": { "balance": "1606938044258990275541962092341162602522202993782792835301376i" }
"account_2": { "balance": "1606938044258990275541962092341162602522202993782792835301376i" }
"account_1": { "balance": "1606938044258990275541962092341162602522202993782792835301376i" }
    "0x0000000000000000000000000000000000000008": { "builtin": { "name": "alt_bn128_pairing", "activate_at": "0x0", "pricing": { "alt_bn128_pairing": { "base": 100000, "pair": 80000 } } } },
    "0x00Ea169ce7e0992960D3BdE6F5D539C955316432": { "balance": "1606938044258990275541962092341162602522202993782792835301376" }
 }

答案3

我时不时地喜欢 sed 挑战：使用ACCOUNT_ADDR=1234：

sed -n -e '
    x
    $ i\
"'"$ACCOUNT_ADDR"'": {"balance":0},
    2,$ p
    $ { x; p }
' file

 "accounts": {
    "0x0000000000000000000000000000000000000008": { "builtin": { "name": "alt_bn128_pairing", "activate_at": "0x0", "pricing": { "alt_bn128_pairing": { "base": 100000, "pair": 80000 } } } },
"1234": {"balance":0},
    "0x00Ea169ce7e0992960D3BdE6F5D539C955316432": { "balance": "1606938044258990275541962092341162602522202993782792835301376" }
 }

这使用x将当前行存储到保留空间中，以成为下一个周期中的“上一个”行。

正如其他地方提到的，用于sed -i就地保存编辑

您可以通过反转文件并使用更简单的 sed 命令获得相同的结果：

temp=$(mktemp)
tac file | sed '2a\
"'"$ACCOUNT_ADDR"'": {"balance":0},
' | tac > "$temp" && mv "$temp" file

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