{
"mode": "man",
"parameter": "sha1sum",
"section": "1",
"url": "https://www.chedong.com/phpMan.php/man/sha1sum/1/json",
"generated": "2026-06-03T00:21:14Z",
"synopsis": "sha1sum [OPTION]... [FILE]...",
"sections": {
"NAME": {
"content": "sha1sum - compute and check SHA1 message digest\n",
"subsections": []
},
"SYNOPSIS": {
"content": "sha1sum [OPTION]... [FILE]...\n",
"subsections": []
},
"DESCRIPTION": {
"content": "Print or check SHA1 (160-bit) checksums.\n\nWith no FILE, or when FILE is -, read standard input.\n",
"subsections": [
{
"name": "-b --binary",
"content": "read in binary mode\n",
"flag": "-b",
"long": "--binary"
},
{
"name": "-c --check",
"content": "read SHA1 sums from the FILEs and check them\n\n--tag create a BSD-style checksum\n",
"flag": "-c",
"long": "--check"
},
{
"name": "-t --text",
"content": "read in text mode (default)\n",
"flag": "-t",
"long": "--text"
},
{
"name": "-z --zero",
"content": "end each output line with NUL, not newline, and disable file name escaping\n",
"flag": "-z",
"long": "--zero"
},
{
"name": "The following five options are useful only when verifying checksums:",
"content": ""
},
{
"name": "--ignore-missing",
"content": "don't fail or report status for missing files\n",
"long": "--ignore-missing"
},
{
"name": "--quiet",
"content": "don't print OK for each successfully verified file\n",
"long": "--quiet"
},
{
"name": "--status",
"content": "don't output anything, status code shows success\n",
"long": "--status"
},
{
"name": "--strict",
"content": "exit non-zero for improperly formatted checksum lines\n",
"long": "--strict"
},
{
"name": "-w --warn",
"content": "warn about improperly formatted checksum lines\n\n--help display this help and exit\n",
"flag": "-w",
"long": "--warn"
},
{
"name": "--version",
"content": "output version information and exit\n\nThe sums are computed as described in FIPS-180-1. When checking, the input should be a for‐\nmer output of this program. The default mode is to print a line with checksum, a space, a\ncharacter indicating input mode ('*' for binary, ' ' for text or where binary is insignifi‐\ncant), and name for each FILE.\n\nNote: There is no difference between binary mode and text mode on GNU systems.\n",
"long": "--version"
}
]
},
"BUGS": {
"content": "Do not use the SHA-1 algorithm for security related purposes. Instead, use an SHA-2 algo‐\nrithm, implemented in the programs sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1), or\nthe BLAKE2 algorithm, implemented in b2sum(1)\n",
"subsections": []
},
"AUTHOR": {
"content": "Written by Ulrich Drepper, Scott Miller, and David Madore.\n",
"subsections": []
},
"REPORTING BUGS": {
"content": "GNU coreutils online help: \nReport any translation bugs to \n",
"subsections": []
},
"COPYRIGHT": {
"content": "Copyright © 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later\n.\nThis is free software: you are free to change and redistribute it. There is NO WARRANTY, to\nthe extent permitted by law.\n",
"subsections": []
},
"SEE ALSO": {
"content": "Full documentation \nor available locally via: info '(coreutils) sha1sum invocation'\n\n\n\nGNU coreutils 8.32 January 2026 SHA1SUM(1)",
"subsections": []
}
},
"summary": "sha1sum - compute and check SHA1 message digest",
"flags": [
{
"flag": "-b",
"long": "--binary",
"arg": null,
"description": "read in binary mode"
},
{
"flag": "-c",
"long": "--check",
"arg": null,
"description": "read SHA1 sums from the FILEs and check them --tag create a BSD-style checksum"
},
{
"flag": "-t",
"long": "--text",
"arg": null,
"description": "read in text mode (default)"
},
{
"flag": "-z",
"long": "--zero",
"arg": null,
"description": "end each output line with NUL, not newline, and disable file name escaping"
},
{
"flag": "",
"long": "--ignore-missing",
"arg": null,
"description": "don't fail or report status for missing files"
},
{
"flag": "",
"long": "--quiet",
"arg": null,
"description": "don't print OK for each successfully verified file"
},
{
"flag": "",
"long": "--status",
"arg": null,
"description": "don't output anything, status code shows success"
},
{
"flag": "",
"long": "--strict",
"arg": null,
"description": "exit non-zero for improperly formatted checksum lines"
},
{
"flag": "-w",
"long": "--warn",
"arg": null,
"description": "warn about improperly formatted checksum lines --help display this help and exit"
},
{
"flag": "",
"long": "--version",
"arg": null,
"description": "output version information and exit The sums are computed as described in FIPS-180-1. When checking, the input should be a for‐ mer output of this program. The default mode is to print a line with checksum, a space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignifi‐ cant), and name for each FILE. Note: There is no difference between binary mode and text mode on GNU systems."
}
],
"examples": [],
"see_also": [],
"tldr": {
"source": "official",
"description": "Calculate SHA1 cryptographic checksums.",
"examples": [
{
"description": "Calculate the SHA1 checksum for one or more files",
"command": "sha1sum {{path/to/file1 path/to/file2 ...}}"
},
{
"description": "Calculate and save the list of SHA1 checksums to a file",
"command": "sha1sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.sha1}}"
},
{
"description": "Calculate a SHA1 checksum from `stdin`",
"command": "{{command}} | sha1sum"
},
{
"description": "Read a file of SHA1 checksums and filenames and verify all files have matching checksums",
"command": "sha1sum {{-c|--check}} {{path/to/file.sha1}}"
},
{
"description": "Only show a message for missing files or when verification fails",
"command": "sha1sum {{-c|--check}} --quiet {{path/to/file.sha1}}"
},
{
"description": "Only show a message when verification fails, ignoring missing files",
"command": "sha1sum --ignore-missing {{-c|--check}} --quiet {{path/to/file.sha1}}"
},
{
"description": "Check a known SHA1 checksum of a file",
"command": "echo {{known_sha1_checksum_of_the_file}} {{path/to/file}} | sha1sum {{-c|--check}}"
}
]
}
}