バイナリエディタの無い環境で、バイナリファイルを編集する方法。
echo と dd の組み合わせでいけます。
サンプルとして、あらかじめ、128 byte の All 0x00 データ (hoge.dat)を作っておきます。
このファイルの作り方については、まさおのブログ (表): 任意サイズのファイルを作る 参照。
hexdump で内容確認。
$ hexdump -Cv hoge.dat 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000080
16 byte 目 (0x00000010) から 2 byte の 0x5A5A を書き込む例。
0x5A は ASCII の "Z" ですが、任意の 16 進数データを書き込むことができます。
$ echo -en '\x5A\x5A' | dd of=./hoge.dat bs=1 seek=16 conv=notrunc 2+0 records in 2+0 records out $ hexdump -Cv hoge.dat 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000010 5a 5a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |ZZ..............| 00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000080
参考： http://blog.heartnet.me/2012/07/dd.html
● バイナリ, 編集, binary, edit, bvi, なし, editor, not use, dd, echo, hexdump, 修正, seek
