将己糖倾倒物送入sed

Question

我有一个名为samples.txt的文件，其中有374371行，创建如下：

hexdump -e '8/1 "%02x " "n"' samples.bin > samples.txt

它看起来像这样(不推荐使用(：

1a 03 1a 03 4a 03 57 03
4b 03 44 03 1e 03 09 04
10 03 19 03 40 03 ae 03
1e 03 26 03 33 03 ad 03
10 03 84 03 43 03 62 03
e0 03 16 03 34 03 c4 03
f8 02 3b 03 53 03 61 03
10 03 15 03 42 03 58 03
23 03 1f 03 57 03 62 03
17 03 73 03 31 03 33 03
14 03 ff 02 30 03 51 03
5f 03 42 03 47 03 7e 03
ba 03 26 03 35 03 a0 03
08 03 33 03 36 03 c8 03
0c 03 38 03 97 03 44 03

和以下sed命令：

echo "                ch0    ch1    ch2    ch3"; cat -n samples.txt | sed 's/s*([0-9]*)s*([0-9a-f]*) ([0-9a-f]*) ([0-9a-f]*) ([0-9a-f]*) ([0-9a-f]*) ([0-9a-f]*) ([0-9a-f]*) ([0-9a-f]*)/Sample 1:t0x23 0x45 0x67 0x89/' | head -n 15

给我的输出看起来像这样：

ch0    ch1    ch2    ch3
Sample 1:       0x1a03 0x1a03 0x4a03 0x5703
Sample 2:       0x4b03 0x4403 0x1e03 0x0904
Sample 3:       0x1003 0x1903 0x4003 0xae03
Sample 4:       0x1e03 0x2603 0x3303 0xad03
Sample 5:       0x1003 0x8403 0x4303 0x6203
Sample 6:       0xe003 0x1603 0x3403 0xc403
Sample 7:       0xf802 0x3b03 0x5303 0x6103
Sample 8:       0x1003 0x1503 0x4203 0x5803
Sample 9:       0x2303 0x1f03 0x5703 0x6203
Sample 10:      0x1703 0x7303 0x3103 0x3303
Sample 11:      0x1403 0xff02 0x3003 0x5103
Sample 12:      0x5f03 0x4203 0x4703 0x7e03
Sample 13:      0xba03 0x2603 0x3503 0xa003
Sample 14:      0x0803 0x3303 0x3603 0xc803
Sample 15:      0x0c03 0x3803 0x9703 0x4403

在我看来，将hexdump的输出重定向到临时samples.txt文件是低效的，因为对于一个文件，你必须在最后删除它，对于两个文件，也许在内存中的数据上使用sed比在磁盘上更快。如何跳过samples.txt文件并获得相同的结果？

Answer 1

如果我正确理解您的意图，我认为以下内容应该有效。

hexdump -e '8/1 "%02x " "n"' samples.bin | cat -n | sed '....

Answer 2

具有xxd和coreutils的替代方案：

{
# Print header
printf "ttCh0    Ch1    Ch2    Ch3n"
# Create hexdump of data
xxd -p samples.bin       |
# Use 16 bit samples
fold -w4                 |
# Add hex indicator
sed 's/^/0x/'            |
# Data contains 4 interleaved channels
xargs -n4                |
# Number each sample
nl -n ln                 |
sed 's/ /:/; s/^/Sample /'
} > samples.out

samples.out:的内容

Ch0    Ch1    Ch2    Ch3
Sample 1:       0x1a03 0x1a03 0x4a03 0x5703
Sample 2:       0x4b03 0x4403 0x1e03 0x0904
Sample 3:       0x1003 0x1903 0x4003 0xae03
Sample 4:       0x1e03 0x2603 0x3303 0xad03
Sample 5:       0x1003 0x8403 0x4303 0x6203
Sample 6:       0xe003 0x1603 0x3403 0xc403
Sample 7:       0xf802 0x3b03 0x5303 0x6103
Sample 8:       0x1003 0x1503 0x4203 0x5803
Sample 9:       0x2303 0x1f03 0x5703 0x6203
Sample 10:      0x1703 0x7303 0x3103 0x3303
Sample 11:      0x1403 0xff02 0x3003 0x5103
Sample 12:      0x5f03 0x4203 0x4703 0x7e03
Sample 13:      0xba03 0x2603 0x3503 0xa003
Sample 14:      0x0803 0x3303 0x3603 0xc803
Sample 15:      0x0c0a 0x3803 0x9703 0x4403