I've been trying to figure out what this line does for a few hours. I have to automate the step using ansible and can't find anything on the create command. Any help is appreciated.

echo -e "create /tmp/v8-install/lib/libv8_libplatform.a\naddlib out/native/obj.target/tools/gyp/libv8_libplatform.a\nsave\nend" | sudo ar -M

  • I don't think create is a command. BTW, I see that ar is an archive utility. – UniversallyUniqueID Apr 25 '16 at 17:30

That command is copying an ar archive from




Here's an explanation:

  • echo -e "..." prints on standard output the string .... Every \n is replaced with a new line.
  • The | (pipe) operator sends the output from echo to ar -M.
  • ar is an archive utility (similar to tar or zip). The option -M is used to read commands from the standard input.
  • sudo is used to run ar as root.

That command is equivalent to running sudo ar -M and manually typing these lines:

create /tmp/v8-install/lib/libv8_libplatform.a
addlib out/native/obj.target/tools/gyp/libv8_libplatform.a
  • create (unsurprising) creates a new archive.
  • addlib copies all the contents of an archive to the newly created archive.
  • save and end are self-explanatory.

If you want to learn more, check out the documentation for AR.

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