35 lines
773 B
Bash
Executable File
35 lines
773 B
Bash
Executable File
#!/usr/bin/env sh
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# hash-id — 產生 8 碼大寫 SHA-1 hash。
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# 用法:
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# hash-id <text>
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# printf '%s' <text> | hash-id
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# 規則:
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# 先取 SHA-1 前 8 碼大寫。
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# 若首碼為 0-9、A、B、C，改成 H 加上原 SHA-1 前 7 碼。
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set -eu
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input=''
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if [ "$#" -gt 0 ]; then
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input=$*
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elif [ -t 0 ]; then
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input=''
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else
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input=$(cat)
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fi
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if command -v sha1sum >/dev/null 2>&1; then
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raw=$(printf '%s' "$input" | sha1sum | awk '{print $1}')
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elif command -v shasum >/dev/null 2>&1; then
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raw=$(printf '%s' "$input" | shasum -a 1 | awk '{print $1}')
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else
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echo 'no SHA-1 helper found' >&2
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exit 1
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fi
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hash=$(printf '%s' "$raw" | cut -c1-8 | tr a-f A-F)
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case "$hash" in
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[0-9ABC]*) hash="H$(printf '%s' "$hash" | cut -c1-7)" ;;
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esac
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printf '%s\n' "$hash"
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