Revisions to How can I copy arbitrary part of binary file with reasonable speed?

with the edit by ilkkachu, the argument to head -c is now the length of the segment to extract, not the end position

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edit approved Mar 29, 2023 at 16:56

1.7k
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Try this:

tail -c +$FROM file.dat | head -c $TO$LENGTH > file1.dat

Just assign FROM and TOLENGTH as you need. Note that the numbering for tail is one-based and e.g. tail -c +4 means to start at the fourth byte, that is to skip the first three bytes.

As an example:

$ printf 'abcdefghijklmnopqrstuvwxyz\n' > test.txt
$ tail -c +4 test.txt | head -c 6; echo
defghi

Try this:

tail -c +$FROM file.dat | head -c $TO > file1.dat

Just assign FROM and TO as you need. Note that the numbering for tail is one-based and e.g. tail -c +4 means to start at the fourth byte, that is to skip the first three bytes.

As an example:

$ printf 'abcdefghijklmnopqrstuvwxyz\n' > test.txt
$ tail -c +4 test.txt | head -c 6; echo
defghi

Try this:

tail -c +$FROM file.dat | head -c $LENGTH > file1.dat

Just assign FROM and LENGTH as you need. Note that the numbering for tail is one-based and e.g. tail -c +4 means to start at the fourth byte, that is to skip the first three bytes.

As an example:

$ printf 'abcdefghijklmnopqrstuvwxyz\n' > test.txt
$ tail -c +4 test.txt | head -c 6; echo
defghi

added 284 characters in body

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edited Mar 29, 2023 at 10:29

ilkkachu

148.1k
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441

Try this:

headtail -c $TO+$FROM file.dat | tailhead -c +$FROM$TO > file1.dat

Just assign FROM and TO as you need. Note that the numbering for tail is one-based and e.g. tail -c +4 means to start at the fourth byte, that is to skip the first three bytes.

As an example:

$ printf 'abcdefghijklmnopqrstuvwxyz\n' > test.txt
$ tail -c +4 test.txt | head -c 6; echo
defghi

Try this:

head -c $TO file.dat | tail -c +$FROM > file1.dat

Just assign FROM and TO as you need.

Try this:

tail -c +$FROM file.dat | head -c $TO > file1.dat

Just assign FROM and TO as you need. Note that the numbering for tail is one-based and e.g. tail -c +4 means to start at the fourth byte, that is to skip the first three bytes.

As an example:

$ printf 'abcdefghijklmnopqrstuvwxyz\n' > test.txt
$ tail -c +4 test.txt | head -c 6; echo
defghi

Source Link

answered Mar 27, 2023 at 19:27

White Owl

5.3k
1
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16

Try this:

head -c $TO file.dat | tail -c +$FROM > file1.dat

Just assign FROM and TO as you need.

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