:#!/bin/sh# gzexe: compressor for Unix executables.# Use this only for binaries that you do not use frequently.## The compressed version is a shell script which decompresses itself after# skipping $skip lines of shell commands.  We try invoking the compressed# executable with the original name (for programs looking at their name).# We also try to retain the original file permissions on the compressed file.# For safety reasons, gzexe will not create setuid or setgid shell scripts.# WARNING: the first line of this file must be either : or #!/bin/sh# The : is required for some old versions of csh.# On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5x=`basename $0`if test $# = 0; then  echo compress executables. original file foo is renamed to foo~  echo usage: ${x} [-d] files...  echo   "   -d  decompress the executables"  exit 1fitmp=gz$$trap "rm -f $tmp; exit 1" 1 2 3 5 10 13 15decomp=0res=0test "$x" = "ungzexe" && decomp=1if test "x$1" = "x-d"; then  decomp=1  shiftfiecho hi > zfoo1$$echo hi > zfoo2$$if test -z "`(${CPMOD-cpmod} zfoo1$$ zfoo2$$) 2>&1`"; then  cpmod=${CPMOD-cpmod}firm -f zfoo[12]$$tail=""IFS="${IFS= 	}"; saveifs="$IFS"; IFS="${IFS}:"for dir in $PATH; do  test -z "$dir" && dir=.  if test -f $dir/tail; then    tail="$dir/tail"    break  fidoneIFS="$saveifs"if test -z "$tail"; then  echo cannot find tail  exit 1fifor i do  if test ! -f "$i" ; then    echo ${x}: $i not a file    res=1    continue  fi  if test $decomp -eq 0; then    if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then      echo "${x}: $i is already gzexe'd"      continue    fi  fi  if ls -l "$i" | grep '^...[sS]' > /dev/null; then    echo "${x}: $i has setuid permission, unchanged"    continue  fi  if ls -l "$i" | grep '^......[sS]' > /dev/null; then    echo "${x}: $i has setgid permission, unchanged"    continue  fi  case "`basename $i`" in  gzip | tail | chmod | ln | sleep | rm)	echo "${x}: $i would depend on itself"; continue ;;  esac  if test -z "$cpmod"; then    cp -p "$i" $tmp 2>/dev/null || cp "$i" $tmp    if test -w $tmp 2>/dev/null; then      writable=1    else      writable=0      chmod u+w $tmp 2>/dev/null    fi  fi  if test $decomp -eq 0; then    sed 1q $0 > $tmp    sed "s|^if tail|if $tail|" >> $tmp <<'EOF'skip=18if tail +$skip $0 | "BINDIR"/gzip -cd > /tmp/gztmp$$; then  /bin/chmod 700 /tmp/gztmp$$  prog="`echo $0 | /bin/sed 's|^.*/||'`"  if /bin/ln /tmp/gztmp$$ "/tmp/$prog" 2>/dev/null; then    trap '/bin/rm -f /tmp/gztmp$$ "/tmp/$prog"; exit $res' 0    (/bin/sleep 5; /bin/rm -f /tmp/gztmp$$ "/tmp/$prog") 2>/dev/null &    /tmp/"$prog" ${1+"$@"}; res=$?  else    trap '/bin/rm -f /tmp/gztmp$$; exit $res' 0    (/bin/sleep 5; /bin/rm -f /tmp/gztmp$$) 2>/dev/null &    /tmp/gztmp$$ ${1+"$@"}; res=$?  fielse  echo Cannot decompress $0; exit 1fi; exit $resEOF    "BINDIR"/gzip -cv9 "$i" >> $tmp || {      /bin/rm -f $tmp      echo ${x}: compression not possible for $i, file unchanged.      res=1      continue    }  else    # decompression    skip=18    if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then      eval `sed -e 1d -e 2q "$i"`    fi    if tail +$skip "$i" | "BINDIR"/gzip -cd > $tmp; then      :    else      echo ${x}: $i probably not in gzexe format, file unchanged.      res=1      continue    fi  fi  rm -f "$i~"  mv "$i" "$i~" || {    echo ${x}: cannot backup $i as $i~    rm -f $tmp    res=1    continue  }  mv $tmp "$i" || cp -p $tmp "$i" 2>/dev/null || cp $tmp "$i" || {    echo ${x}: cannot create $i    rm -f $tmp    res=1    continue  }  rm -f $tmp  if test -n "$cpmod"; then    $cpmod "$i~" "$i" 2>/dev/null  elif test $writable -eq 0; then    chmod u-w $i 2>/dev/null  fidoneexit $res