The info command displays detailed information about compression formats, codecs, and hashers supported by 7-Zip.
Syntax
Usage
# Display all supported formats
7z i
- Archive formats (7z, ZIP, TAR, etc.)
- Compression codecs (LZMA, LZMA2, PPMd, etc.)
- Hash functions (CRC32, SHA256, etc.)
- Filters (BCJ, BCJ2, Delta, ARM, etc.)
# Show information about 7z format
7z i 7z
# Show information about ZIP format
7z i zip
# Show information about TAR format
7z i tar
Example Output
$ 7z i
7-Zip 26.00 (x64) : Copyright (c) 1999-2026 Igor Pavlov : 2026-03-01
Formats:
Lib ID Name
0 01 7z
0 02 Arj
0 03 BZip2
0 04 Cab
0 05 Chm
0 06 Compound
0 07 Cpio
0 08 CramFS
0 09 Dmg
0 0A ELF
0 0B Ext
0 0C FAT
0 0D FLV
0 0E GZip
0 0F HFS
0 10 IHex
0 11 Iso
0 12 Lzh
0 13 Lzma
0 14 Lzma86
0 15 MachO
0 16 Mbr
0 17 Msi
0 18 Mub
0 19 Nsis
0 1A Ntfs
0 1B PE
0 1C Rar
0 1D Rar5
0 1E Rpm
0 1F Split
0 20 SquashFS
0 21 SWF
0 22 SWFc
0 23 Tar
0 24 TE
0 25 Udf
0 26 UEFIc
0 27 UEFIs
0 28 Vhd
0 29 Wim
0 2A Xar
0 2B XZ
0 2C Z
0 2D Zip
Codecs:
Lib ID Name
0 030101 LZMA
0 030401 PPMD
0 040202 BZip2
0 21 LZMA2
Hashers:
Lib Size ID Name
0 4 1 CRC32
0 8 4 CRC64
0 32 A SHA256
0 20 201 SHA1
0 8 202 XXH64
- ID - Format identifier (hexadecimal)
- Name - Format name
- Lib - Library index (0 = built-in)
Codecs
Compression methods:
- LZMA - Original LZMA algorithm (ID: 030101)
- LZMA2 - Improved LZMA (ID: 21)
- PPMd - Prediction by partial matching (ID: 030401)
- BZip2 - Burrows-Wheeler transform (ID: 040202)
Hashers
Supported hash functions:
- CRC32 - 32-bit cyclic redundancy check
- CRC64 - 64-bit CRC
- SHA256 - 256-bit secure hash
- SHA1 - 160-bit secure hash
- XXH64 - Fast 64-bit hash
Use Cases
# Check if a format is supported
7z i | grep -i "wim"
Verify Codec Availability
# Check available codecs
7z i | grep -A 10 "Codecs:"
List Hash Functions
# Show all hash functions
7z i | grep -A 10 "Hashers:"
# 7z format capabilities
7z i 7z
# Output shows:
# - Supported compression methods
# - Encryption support
# - Solid archive support
# - Multi-volume support
Scripting Example
#!/bin/bash
# Check if 7-Zip supports a specific format
check_format() {
local format=$1
if 7z i | grep -qi "$format"; then
echo "Format $format is supported"
return 0
else
echo "Format $format is NOT supported"
return 1
fi
}
# Usage
check_format "zip"
check_format "rar"
check_format "7z"
- 7-Zip version number
- Architecture (x86, x64, ARM, etc.)
- Copyright information
- Build date
7z i | head -3
# 7-Zip 26.00 (x64) : Copyright (c) 1999-2026 Igor Pavlov : 2026-03-01
The info command is useful for verifying that 7-Zip supports a particular format before attempting to work with archives of that type.
Use 7z i | less to page through the full list of formats and codecs on systems with many formats installed.
See Also