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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ssh-copy-id fails if powershell is default shell","articleBody":"ssh-copy-id is a popular shebang bash script to make it easy to deploy public keys on target machines for key based authn.  \r\nThe problem is that this script uses the POSIX shell cmd `exec` which is unknown to powershell:\r\n\r\n```bash\r\nssh \"$@\" \"exec sh -c 'cd ; umask 077 ; mkdir -p .ssh \u0026\u0026 cat \u003e\u003e .ssh/authorized_keys\r\n```\r\n\r\nThis can block adoption of powershell as the default shell (via chsh)\r\n\r\n\u003c!--\r\n\r\nIf it is a bug report:\r\n- make sure you are able to repro it on the latest released version. \r\nYou can install the latest version from https://github.com/PowerShell/PowerShell/releases\r\n- Search the existing issues.\r\n- Refer to the [FAQ](../docs/FAQ.md).\r\n- Refer to the [known issues](../docs/KNOWNISSUES.md).\r\n- Fill out the following repro template\r\n\r\nIf it's not a bug, please remove the template and elaborate the issue in your own words.\r\n--\u003e\r\n\r\nSteps to reproduce\r\n------------------\r\n\r\n```powershell\r\nPS\u003e ssh-copy-id user@host\r\n```\r\n\r\nExpected behavior\r\n-----------------\r\n\r\n```none\r\nSuccess\r\n```\r\n\r\nActual behavior\r\n---------------\r\n\r\n```none\r\nssh-copy-id user@host/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed\r\n/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys\r\nuser@host's password: \r\nexec : The term 'exec' is not recognized as the name of a cmdlet, function, \r\nscript file, or operable program. Check the spelling of the name, or if a path \r\nwas included, verify that the path is correct and try again.\r\nAt line:1 char:1\r\n+ exec sh -c 'cd ; umask 077 ; mkdir -p .ssh \u0026\u0026 cat \u003e\u003e .ssh/authorized_ ...\r\n+ ~~~~\r\n    + CategoryInfo          : ObjectNotFound: (exec:String) [], CommandNotFoun \r\n   dException\r\n    + FullyQualifiedErrorId : CommandNotFoundException\r\n```\r\n\r\nEnvironment data\r\n----------------\r\n\r\n\u003c!-- provide the output of $PSVersionTable --\u003e\r\n\r\n```powershell\r\nName                           Value                                                                                                \r\n----                           -----                                                                                                \r\nPSVersion                      6.0.0-beta                                                                                           \r\nPSEdition                      Core                                                                                                 \r\nGitCommitId                    v6.0.0-beta.6                                                                                        \r\nOS                             Linux 4.10.0-32-generic #36~16.04.1-Ubuntu SMP Wed Aug 9 09:19:02 UTC 2017                           \r\nPlatform                       Unix                                                                                                 \r\nPSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                              \r\nPSRemotingProtocolVersion      2.3                                                                                                  \r\nSerializationVersion           1.1.0.1                                                                                              \r\nWSManStackVersion              3.0             \r\n\r\n```\r\n","author":{"url":"https://github.com/SteveL-MSFT","@type":"Person","name":"SteveL-MSFT"},"datePublished":"2017-08-28T20:59:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/4691/PowerShell/issues/4691"}