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# stats: perform statistical calculations on a file or standard input
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# Copyright 2017 Dustin Kirkland <dustin.kirkland@gmail.com>
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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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# http://www.apache.org/licenses/LICENSE-2.0
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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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# Work from a temp file, which we'll clean up when done
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trap "rm -f ${file}" HUP INT QUIT ILL TRAP KILL BUS TERM
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# Handle either a file as argument, or standard input
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cat /dev/stdin >"$file"
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# Determine our operating mode by how we were called
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awk -v min=0 'NR == 1 || $1 < min {line = $0; min = $1} END {print min}' "$file"
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awk -v max=0 'NR == 1 || $1 > max {line = $0; max = $1} END {print max}' "$file"
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awk '{ sum += $1; n++ } END { if (n > 0) print sum / n; }' "$file"
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sort -g "$file" | awk '{ a[i++]=$1; } END { print a[int(i/2)]; }'
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sort -g "$file" | uniq -c | sort -r -g | head -n1 | awk '{print $2}'
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awk '{ x+=$0; y+=$0^2 } END { print sqrt(y/NR-(x/NR)^2) }' "$file"
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sort -g "$file" | uniq -c | sort -r -g
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awk '{ sum += $1 } END { print sum }' "$file"
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bin/stats
