Path: csiph.com!goblin3!goblin.stu.neva.ru!panix!usenet.stanford.edu!not-for-mail From: =?UTF-8?B?TMOpYSBHcmlz?= Newsgroups: gnu.bash.bug Subject: Re: Two states of empty arrays Date: Thu, 12 Dec 2019 22:04:22 +0100 Organization: French Data Network Lines: 50 Approved: bug-bash@gnu.org Message-ID: References: <79b6365d-4c09-7122-25c3-4564fd304948@case.edu> NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: usenet.stanford.edu 1576184670 2393 209.51.188.17 (12 Dec 2019 21:04:30 GMT) X-Complaints-To: action@cs.stanford.edu To: gnu-bash-bug@moderators.isc.org Envelope-to: bug-bash@gnu.org Delivered-To: gnu-bash-bug@moderators.isc.org User-Agent: Telnet/1.0 [tlh] (PDP11/DEC) Autocrypt: addr=lea.gris@noiraude.net; prefer-encrypt=mutual; keydata= mQINBE8OHUcBEADQjtKQcz/T/msKQcvyWEmBz5aKFGYjdErVABpJAiGqNa9m7kr2P5i7iXR/ nuUswsPlVmRxeIWsAMxoU02cwicRoydEJgbZH6KwXMmAynersG70JIobOXF2g5W683pf1R35 PNjrw3sIiQJgpRi2idL0Fvhp8h78fvHkseaomRg8r8zvOQ4AnbWcywDwbZzDVLrMuEUi27Yh j86RaJDcv6P0ygmMiVFHYFyIDBpl2uVbePanpjT8lwzBCJ1MVzc0Bfyi2W0dYlK1dP5pWeQb kMmizpg4SqF0mMSH1Iq8q9AR+M+eN7K2yzpJ3Nez+GurpAkXEdomCF9CkKQbRRbR+AiZfl6n cJwg0+dhJn70vSwdEyRHlX/39ZZA9v4PC18Ukjf9nY9Bb3vl8M5Mo/g9zHertjPlQcGwOubn 05fuehh7H4kUAPhT0w/6R05gT/lw2e89i7TP/Qxixc00DU6mJX3OEWg23fGt8m22mA92+XQx ZEvAviZSjvj+xL7wP7u9r+4RfNT9N1Ebs9tGXFYIpbBZSKaPFTmzJHILuya+otaFs9DKXRWI 9R3W8sP0YHCEfZpYHoAFfofmC4hZds40z7/msqVJ+2XaPfXsmXCL/juWpYJF3LbPdN87r5UY fqmx3ezTYRofa1pxzZn60fmkFuSUH7qqvKKIdheDlqZI6D3+aQARAQABtC9Mw6lhIEdyaXMg KExhIE5vaXJhdWRlKSA8bGVhLmdyaXNAbm9pcmF1ZGUubmV0PokCOwQTAQIAJQIbAwYLCQgH AwIGFQgCCQoLBBYCAwECHgECF4AFAlAAB+cCGQEACgkQcJRvFoB47VIa2w/7B3S51cvmOPHy rfybG0NdGQzSDRFhvVHXGQC62JMzT+i5fzkRNAk7LCvWS1PBmh79rokf8qhx5xQ/xlBo5IR0 K0yxRXs3Yr90opcu20qKIYjryTqiKkB41XY+oCQXpRqjP2LtkWL52yXMLbqfI4XQ4j2RveE/ HR/+Y4bCtnYZb/O1Y4Cl9gslOK1+xpYWaHHu2yNGgXwFYo4ujryzygmb4i/LMblPHw3nmNTr O4u0jyuejrq7qgrnwM8JQrIuyIOWbdMRPMKOgb8AIsFPLqIvnYcYB8ms/ilcHOjANTE5j/3H ZlvyMbNXsLZKFArnrw9ju6aExXoCx17Y0hkMPH1u7RGCB0Cc62fogB526OZs/bbPmngiuhAk gJbyuUjQzAz44kxuzsG9pkOUSUF/TF7BupG3K4e+RjxKjsdEe1ohsW8Eul+F0XIX1R0i84Jf hO6hVI2iywvEyjd2syEu7uvVBJJeQh5sYuAwLmixPISbS0OjGRiLlgPwejqJIkVElGQTQbLh N0CdHijKtMYYBkhEZjZ+0Mysw2kmRo28z6cdd7wmFpjt57L9Lw4qLP1KvkospnYN5+zBmwaB lHf6TxdkxGCuaviQ6N/PEcIwB3px2aTk/LmIE99vtiihH19PNhIgLXge7JR2tRFVLdfSqs47 YD1oDQY9ZO1h0FtcPKJKs0K5Ag0ETw4dRwEQAKqcD421qgwXKhpyrcb+eTA9UmTTOVTO9MzY cJ9RgACXE3GXdofkhVWzY7/aensghIpxYo+nmKGUS4eixGfPKiZDQPQFFRjBgvkPyKhoui9S x4/96c20+jTQiUlUX0eF5UpZtLBCW7CSPXdQamZbEltXL2Wit41KAP4cysQuvatTKYdVtao1 499lbsbHy5zqrdiV9NAdnPsqKzoKn5GyAEDYQS2OiB6yV2w94ezJUHxoE2zb/b5bHvP7DvqJ GU8vu207h4hgxu77hsByrgDRCazDnEHCYAs12pV3nrebzEVgfZsUvCVKnj+gvV7oFxM1II/8 AICSwcBDn6aGvQISNdzWPTwXdQQwGyur5SKtgnP0tX6DiBFe8xRqQnLBvOcu+E/WVWl3VKzp EHscEoLHCaDbqYPvpz93eFc1sueojnPXnjir6R/fyHlowBuKMcUQJdS5LXXUMAHQw8AdsYVA BjZfTXzGh1LOpEErT0fERtY7Vdi+VgKJWmt5boxxJNtjBMhSq1ZYR/UdMXG6C2Br5Jpl2aPu DwrcwT/HKZCeOKR+usNWQipxRXJ36o/HShc5Z6nWTOK20Txe6+jLzCIwsbhOreRw4SLxWoZS 450rUxIzlGxQ8LQaUl53NE8tQUsqx1LVPlABpqrXN5y8xFph0uNJyB7fzfSDdw9X3Sq8J3+1 ABEBAAGJAh8EGAECAAkFAk8OHUcCGwwACgkQcJRvFoB47VLNMxAAz6Yf92x6wuAgqoYyGNaP BLL9B3Y6LCsds184C3BxHCX4Tf7k7kRWBcWa/SJyNTzbLZBestxH/O28DtA+sdhFx8SOQykg Qx0u3VgRRLIgWRwDhAzCfD8Z9nDMGK4GKOqcHzH4GioQrajGXhKvPvECc8C9tbqkEVapayEa qteNCm1vPEC01+dwg5+xuzAUfsY3Y60wuAHmr+BwDHBrYjrURYsghqnDz9ajmZv4+1bjj7wh IVVPyMwgLCJWgv+Ni2H/s6BffS+NBLdXOxHq1QyKnlYOSHB0WXnBeq3TUAcpU4CejZi7nI6a sFTS7yi7t4rT4xnFiA0FduPoUaaG62Uin4f6XzjZxKLU8GlAuMWbepSXIL+6FQzOjlN/h9jS H9yS721C7O1vjiJJWaVR/oar/dzoxqwRJbz3hyMkg3+P+xFjD/kJ2BApi2ln2mvH0bq75mwV LS60M74u3ryiHGUDgDxO6dUfZ5paBia3+iW99Pfcf9HZtj+4FC861X5fsCwL3oXvEoToJWjX 3GbP7w/7XyYrxprQy+h8f21ouIgIRzNKDgdScCCepf/M9UdotysxW0zEYAv62ywCuSF+1lhU BfU8IvILfMe+rLmasTwsPBkHAJn/oo73R6dda2rkG8RTyLkrvDPbQYzZrYlzlg5TKLUXPPZr I3KbDCDuQHywEBQ= In-Reply-To: Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 173.199.90.58 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Mailman-Original-Message-ID: X-Mailman-Original-References: <79b6365d-4c09-7122-25c3-4564fd304948@case.edu> Xref: csiph.com gnu.bash.bug:15722 Le 12/12/2019 =C3=A0 20:13, Chet Ramey =C3=A9crivait=E2=80=AF: >> # Empty array declared without parenthesis >> unset myArr >> declare -a myArr >> typeset -p myArr >> echo "${#myArr[@]}" >=20 > This is an unset variable with the array attribute; you have not assign= ed a > value. >> # Empty array declared without parenthesis >> unset myArr >> declare -a myArr=3D() >=20 > This is an empty array variable; you have assigned a value. Thank you and Clint, it makes sense now. I was trying to play the the -v test to detect when an array or associative array has been declared, not necessarily assigned entries key, values, to not error when Bash runs with -o nounset Like here: #!/usr/bin/bash set -o nounset myArr+=3D(["key"]=3D"value") ERR: line 3: key: unbound variable I can test the type of myArr this way: if [[ "$(typeset -p myArr 2>&1)" =3D~ ^declare\ -A ]]; then myArr+=3D(["key"]=3D"value") fi But it looks sub-optimal to test the type and declaration of a variable. The -v test flag cannot be used because it requires the associative array to contain at least a [key]=3Dvalue entry as mentioned in the man bash.1: > -v varname > True if the shell variable varname is set (has been assig= ned a value). _has been assigned a value_ --=20 Lea Gris