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Q&A Calculate the SHA1 checksum of a file

There's a sha1sum tool in GNU coreutils. Here's $ sha1sum emptyfile da39a3ee5e6b4b0d3255bfef95601890afd80709 emptyfile Note the spaces and the filename (emptyfile in this case) in the output...

posted 7mo ago by Iizuki‭  ·  edited 6mo ago by Iizuki‭

Answer
#3: Post edited by user avatar Iizuki‭ · 2024-05-20T05:48:46Z (6 months ago)
Clarify the location of spaces in the command output
  • There's a [`sha1sum`](https://www.gnu.org/software/coreutils/manual/html_node/sha1sum-invocation.html) tool in GNU coreutils.
  • Here's
  • ```shell
  • $ sha1sum emptyfile
  • da39a3ee5e6b4b0d3255bfef95601890afd80709 emptyfile
  • ```
  • Note the trailing spaces and the filename (*emptyfile* in this case) in the output. It needs to be accounted for in pipelines.
  • There's a [`sha1sum`](https://www.gnu.org/software/coreutils/manual/html_node/sha1sum-invocation.html) tool in GNU coreutils.
  • Here's
  • ```shell
  • $ sha1sum emptyfile
  • da39a3ee5e6b4b0d3255bfef95601890afd80709 emptyfile
  • ```
  • Note the spaces and the filename (*emptyfile* in this case) in the output. They may need to be accounted for in pipelines.
#2: Post edited by user avatar Iizuki‭ · 2024-05-13T06:16:52Z (6 months ago)
Remove potentially confusing touch command
  • There's a [`sha1sum`](https://www.gnu.org/software/coreutils/manual/html_node/sha1sum-invocation.html) tool in GNU coreutils:
  • ```shell
  • $ touch file
  • $ sha1sum file
  • da39a3ee5e6b4b0d3255bfef95601890afd80709 file
  • ```
  • Note the trailing spaces and the filename in the output. It needs to be accounted for in pipelines.
  • There's a [`sha1sum`](https://www.gnu.org/software/coreutils/manual/html_node/sha1sum-invocation.html) tool in GNU coreutils.
  • Here's
  • ```shell
  • $ sha1sum emptyfile
  • da39a3ee5e6b4b0d3255bfef95601890afd80709 emptyfile
  • ```
  • Note the trailing spaces and the filename (*emptyfile* in this case) in the output. It needs to be accounted for in pipelines.
#1: Initial revision by user avatar Iizuki‭ · 2024-05-08T07:35:56Z (7 months ago)
There's a [`sha1sum`](https://www.gnu.org/software/coreutils/manual/html_node/sha1sum-invocation.html) tool in GNU coreutils:

```shell
$ touch file
$ sha1sum file
da39a3ee5e6b4b0d3255bfef95601890afd80709  file
```

Note the trailing spaces and the filename in the output. It needs to be accounted for in pipelines.