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Editing File: /usr/share/yarn/bin/yarn

#!/bin/sh
argv0=$(echo "$0" | sed -e 's,\\,/,g')
basedir=$(dirname "$(readlink "$0" || echo "$argv0")")

case "$(uname -s)" in
  Darwin) basedir="$( cd "$( dirname "$argv0" )" && pwd )";;
  Linux) basedir=$(dirname "$(readlink -f "$0" || echo "$argv0")");;
  *CYGWIN*) basedir=`cygpath -w "$basedir"`;;
  *MSYS*) basedir=`cygpath -w "$basedir"`;;
esac

command_exists() {
  command -v "$1" >/dev/null 2>&1;
}

if command_exists node; then
  if [ "$YARN_FORCE_WINPTY" = 1 ] || command_exists winpty && test -t 1; then
    winpty node "$basedir/yarn.js" "$@"
  else
    exec node "$basedir/yarn.js" "$@"
  fi
  ret=$?
# Debian and Ubuntu use "nodejs" as the name of the binary, not "node", so we
# search for that too. See:
# https://lists.debian.org/debian-devel-announce/2012/07/msg00002.html
# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=614907
elif command_exists nodejs; then
  exec nodejs "$basedir/yarn.js" "$@"
  ret=$?
else
  >&2 echo 'Yarn requires Node.js 4.0 or higher to be installed.'
  ret=1
fi

exit $ret

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