Questions tagged [byte]
The byte tag has no usage guidance.
17
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print byte from number in awk
I can print a byte from a string literal like:
awk 'BEGIN {print "\001"}' | cat -v
But I need to print a byte of the result of a bitwise OR.
So how can I print a byte from a number?
Gawk is ...
- 5
2
votes
1
answer
136
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What is "length" of a string in Bourne shell compatibles' `${#string}`?
Arising from this discussion:
When I have (zsh 5.8, bash 5.1.0)
var="ASCII"
echo "${var} has the length ${#var}, and is $(printf "%s" "$var"| wc -c) bytes long"
...
- 7,616
0
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2
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83
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Count bytes of filename
How can I know how many bytes does it weight the name of a filename? Just the file, not the full path.
I've tried this:
echo 'filename.extension' | wc -c
is this right?
- 169
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Execute Program until specific amount of bytes has been returned on stdout, then terminate
Imagine I have the following program/script ./generate-infinite-byte-stream:
#!/bin/bash
echo -n 'hello'
sleep infinity
The infinite sleep command represents a network connection that may or may not ...
- 115
11
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2
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1k
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How do I find the first non-zero byte on a block device, with an optional offset?
I'm trying to find the first non-zero byte (starting from an optional offset) on a block device using dd and print its offset, but I am stuck. I didn't mention dd in the title as I figured there might ...
- 113
0
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2
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69
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Is there a way to strip the high bit of each byte in a file?
I've been trying to figure out if this can be done in sed or tr, but I can't find it.
I have a bunch of files from an old Apple II which have the high bit set on each byte. On a Mac, this results in a ...
- 113
5
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3
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2k
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What is the difference between a byte and a character (at least *nixwise)?
I understand that any character is comprised of one or more byte/s.
If I am not mistaken, at least in *nix operating systems, a character will generally (or totally?) be comprised of only one byte.
...
- 125
1
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4
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666
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How to count the number of bytes in a very large file, grouping the same bytes? [duplicate]
I am searching for a way to get a statistics on a very large (multiple times larger than the available RAM) the outputs what byte values in the files are present and how often:
A0 01 00 FF 77 01 77 ...
- 163
5
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5
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2k
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How to count the number of bytes in a file, grouping the same bytes? [duplicate]
Example: I have the file "mybinaryfile", and the contents in hex are:
A0 01 00 FF 77 01 77 01 A0
I need to know how many A0 bytes there are in this file, how many 01, and so on. The result could be:
...
- 123
0
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1
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176
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Entropy: whats the difference between bits and bytes?
If I use openssl to generate some random data (for a keyfile, for example):
openssl rand -hex 2048 >/tmp/file
Is this 4097 bits (or bytes?) of entropy?
-rw-rw-r-- 1 username username 4097 Oct 30 ...
15
votes
3
answers
14k
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How do I trim bytes from the beginning and end of a file?
I have a file, that has trash (binary header and footer) at the beginning and end of the file. I would like to know how to nuke these bytes. For an example, let's assume 25 bytes from the beginning. ...
- 22.4k
26
votes
3
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1k
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Byte count of "ls -l <random file>" versus that of "wc -c <random file>"
Is there any possible situation when
ls -l file.txt
is showing not the same number of bytes as
wc -c file.txt
In one script I found comparison of those two values. What could be the reason of ...
- 503
16
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4
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31k
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Is there a oneliner that converts a binary file from little endian to big endian?
and vice versa.
I am running a RedHat if relevant.
1
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2
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20k
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What options does wget --report-speed take?
When I do this command:
wget --report-speed=type
they only type it accepts is bits. It won't have numbers, kilobits / kilobytes or bytes.
The help page (wget --help) says:
--report-speed=TYPE ...
- 123
3
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2
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647
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How to bury an invisible mark into lines of text?
How can I bury an invisible mark into random lines of text? Such a mark has to be there, though it will be invisible to someone reading that text printed out on the console.
I want to identify those ...
- 2,083
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1
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How large is the Linux kernel compared to Unix? [closed]
Not in just LOC (lines of code), but in storage size, as in bytes, megabytes, gigabytes, etc.
Also, any sources where I can download the original-based Unix OS? Thanks!
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1
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Why is od calculating decimal values wrong?
This question is related to the answer from enzotib to the question: How could I use Bash to find 2 bytes in a binary file, increase their values, and replace?
This converts the two bytes into its ...
- 15.9k