23 lines
773 B
Bash
23 lines
773 B
Bash
#!/bin/bash
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# Copyright 2023 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# https://stackoverflow.com/questions/50413579/bash-convert-netmask-in-cidr-notation
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c=0 x=0$(printf '%o' "${1//./ }")
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while [ "$x" -gt 0 ]; do
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((c += x % 2, x >>= 1))
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done
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echo "$c"
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