Shell Programming and Scripting

for i in {32768..65535}
do
netstat -an | grep $i > /dev/null 
        if [ $? -ne 0 ]
        then
portcount=$((portcount+1))
        fi
done
echo "Totat free anonymous ports are portcount"

netstat -an > $HOME/netstat.out
for i in {32768..65535}
do
grep $i $HOME/netstat.out > /dev/null
        if [ $? -ne 0 ]
        then
portcount=$((portcount+1))
        fi
done
echo "Totat free anonymous ports are:$portcount"

ports=$((65535-32768))
for i in $(netstat -an  | grep -Eo '[0-9]+' ) 
   do 
   if [ $i -gt 32768 -a $i -lt 65535 ] 
   then 
      ports=$((ports-1))
   fi
done
echo "There are $ports free "

netstat -atu | perl -nae '$F[3]=~/:(\d+)$/;$i++ if $1>32767;END{print "Free anon ports: ",32767-$i,"\n"}'

for i in {32768..65535}
do
netstat -an | grep $i > /dev/null 
        if [ $? -ne 0 ]
        then
portcount=$((portcount+1))
        fi
done
echo "Totat free anonymous ports are portcount"

netstat: illegal option -- t
usage: netstat [-anv] [-f address_family]
       netstat [-n] [-f address_family] [-P protocol] [-g | -p | -s [interval [count]]]
       netstat -m [-v] [interval [count]]
       netstat -i [-I interface] [-an] [-f address_family] [interval [count]]
       netstat -r [-anv] [-f address_family|filter]
       netstat -M [-ns] [-f address_family]
       netstat -D [-I interface] [-f address_family]
Free anon ports: 32767

bash> uname -a
SunOS mypc 5.10 Generic_144488-07 sun4v sparc SUNW,SPARC-Enterprise-T5220

grep: illegal option -- E
grep: illegal option -- o

Usage: grep -hblcnsviw pattern file . . .
 
SunOS 5.10          Last change: 26 Feb 2008                    1
User Commands                                             grep(1)
OPTIONS
     The following options are supported for  both  /usr/bin/grep
     and /usr/xpg4/bin/grep:
     -b    Precedes each line by the block number on which it was
           found. This can be useful in locating block numbers by
           context (first block is 0).
     -c    Prints only a count of the lines that contain the pat-
           tern.
     -h    Prevents the name of the file containing the  matching
           line  from  being  prepended  to that line.  Used when
           searching multiple files.
     -i    Ignores upper/lower case distinction during  comparis-
           ons.
     -l    Prints only the names of files  with  matching  lines,
           separated  by NEWLINE characters.  Does not repeat the
           names of files when the pattern  is  found  more  than
           once.
     -n    Precedes each line by its  line  number  in  the  file
           (first line is 1).
     -s    Suppresses error messages about nonexistent or unread-
           able files.
     -v    Prints all lines except those that  contain  the  pat-
           tern.
     -w    Searches for the expression as a word as if surrounded
           by \< and \>.
 
uname -a
SunOS mypc 5.10 Generic_144488-07 sun4v sparc SUNW,SPARC-Enterprise-T5220