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Use POSIX option -n for head and tail commands.
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@@ -106,8 +106,8 @@ done
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cd "$tmp/tape2"
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tap="$home/diffs.tap"
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head -1 "$diffs" | xargs itstar cvf "$tap"
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tail +2 "$diffs" | xargs itstar rvf "$tap"
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head -n 1 "$diffs" | xargs itstar cvf "$tap"
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tail -n +2 "$diffs" | xargs itstar rvf "$tap"
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itstar rvf "$tap" _temp_/upgrade.xfile
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rm "$diffs"
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