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The getfattr tool is used to get the extended attributes of a file, but is there a tool to add an extended attribute to a file?

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    The manual page tells you that, in the see-also section. – Thomas Dickey Feb 20 '19 at 23:07
  • 'getfattr` only retrieves file ACLs, not all possible extended attributes of a file. – fpmurphy Feb 21 '19 at 2:26
  • @fpmurphy How do you know that getfattr can only retrieve the file's ACLs? based on my testings, I can use it to get other extended attributes also, for example I can get the extended user attributes using this command: getfattr -d file.txt. – John Feb 22 '19 at 14:33
  • @John Perhaps you would care to provide an example of the -d option displaying other extended attributes. AFAIK, the -d only displays the default ACL and not any other type of extended attributes. – fpmurphy Feb 25 '19 at 3:01
  • @fpmurphy I have used this command to set extended attributes: setfattr -n user.hello -v world file.txt, and this command to get extended attributes: getfattr -d -m user file.txt. I was successful in setting and getting the user and security and trusted extended attributes. But when I tried to set the system extended attributes, I got this error: setfattr: file.txt: Operation not supported, but when I tried to get the system extended attributes... – John Feb 28 '19 at 6:54
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Welcome to Unix & Linux.

The setfattr command is the tool you’re looking for.

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