save for filesystem> save {flags} (filename)
--stderr, -e {path}: the filename used to save stderr, only works with -r flag--raw, -r: save file as raw binary--append, -a: append input to the end of the file--force, -f: overwrite the destination--progress, -p: enable progress barfilename: the filename to use| input | output | 
|---|---|
| any | nothing | 
Save a string to foo.txt in the current directory
>'save me'|savefoo.txt
Append a string to the end of foo.txt
>'append me'|save--appendfoo.txt
Save a record to foo.json in the current directory
> { a:1, b:2 } |savefoo.json
Save a running program's stderr to foo.txt
>do-i {} |savefoo.txt--stderrfoo.txt
Save a running program's stderr to separate file
>do-i {} |savefoo.txt--stderrbar.txt
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    https://www.nushell.sh/commands/docs/save.html