https://**blogs.com/MWCloud/p/11490275.html
#!/bin/sh
skip=49
tab=' '
nl='
'
IFS=" $tab$nl"
umask=`umask`
umask 77
gztmpdir=
trap 'res=$?
test -n "$gztmpdir" && rm -fr "$gztmpdir"
(exit $res); exit $res
' 0 1 2 3 5 10 13 15
case $TMPDIR in
/ | /*/) ;;
/*) TMPDIR=$TMPDIR/;;
*) TMPDIR=/tmp/;;
esac
if type mktemp >/dev/null 2>&1; then
gztmpdir=`mktemp -d "${TMPDIR}gztmpXXXXXXXXX"`
else
gztmpdir=${TMPDIR}gztmp$$; mkdir $gztmpdir
fi || { (exit 127); exit 127; }
gztmp=$gztmpdir/$0
case $0 in
-* | */*'
') mkdir -p "$gztmp" && rm -r "$gztmp";;
*/*) gztmp=$gztmpdir/`basename "$0"`;;
esac || { (exit 127); exit 127; }
case `printf 'X\n' | tail -n +1 2>/dev/null` in
X) tail_n=-n;;
*) tail_n=;;
esac
if tail $tail_n +$skip "$gztmp"; then
umask $umask
chmod 700 "$gztmp"
(sleep 5; rm -fr "$gztmpdir") 2>/dev/null &
"$gztmp" ${1+"[email protected]"}; res=$?
else
printf >&2 '%s\n' "Cannot decompress $0"
(exit 127); res=127
fi; exit $res
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