bswap_64 - Linux
Overview
bswap_64 is a command-line utility that performs byte-swapping operations on 64-bit integers, effectively reversing the order of bytes within a 64-bit word. It is commonly used in low-level programming and data conversion tasks, where the byte order of data needs to be adjusted between different architectures or applications.
Syntax
bswap_64 [-h] [--version] [--input-file <file>] [--output-file <file>] <value>
Options/Flags
- -h, –help: Display usage information
- –version: Display version information
- –input-file: Read 64-bit integer from a file
- –output-file: Write swapped integer to a file
Examples
Example 1: Swapping a 64-bit integer from the terminal
echo 0x1234567890abcdef | bswap_64
0xefcdab8967452310
Example 2: Swapping integers from a file
bswap_64 --input-file input.txt --output-file output.txt
Example 3: Swapping integers in a shell script
#!/bin/bash
value=0x1234567890abcdef
swapped_value=$(echo $value | bswap_64)
echo "Original value: $value"
echo "Swapped value: $swapped_value"
Common Issues
- Ensure that the input provided is a valid 64-bit integer in hexadecimal format (starting with "0x").
- Verify that the specified input and output files exist and have appropriate permissions.
Integration
bswap_64 can be used with other Linux commands and tools to achieve more complex tasks. For example:
- Use awk to filter and extract 64-bit integers from a text file and pipe them to bswap_64 for swapping:
awk '{print "0x"$1}' input.txt | bswap_64
Related Commands
- hexdump: Displays data in hexadecimal format
- od: Dumps files in various formats, including hex
- xxd: Hexadecimal and ASCII data dumper