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      1 #!/bin/sh
      2 set -eu
      3 
      4 die() {
      5 	echo "$*" 1>&2
      6 	exit 1
      7 }
      8 
      9 for fname; do
     10 	{ grep '^#' "$fname" || die "Missing comment line in $fname"
     11 	  grep -v '^#' "$fname" | LC_ALL=C sort
     12 	} > "$fname.tmp"
     13 	mv "$fname.tmp" "$fname"
     14 done
     15