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Top Forums Shell Programming and Scripting Help Generate new port base on the last port but not in used by other application Post 303004425 by lxdorney on Monday 2nd of October 2017 02:51:39 AM
Old 10-02-2017
Thanks to all, heres my logic
Code:
#!/bin/sh
CHECKTHIS=$(cat /opt/curport)
CHECKTHISPORT=$CHECKTHIS
func_checker () {
USEDPORTS=$(netstat -ntpl |awk '{print $4}' |rev |cut -f1 -d: |rev |sort -u |head -n -2 |grep $CHECKTHISPORT)
if [ "$CHECKTHISPORT" == "$USEDPORTS" ]; then
CHECKTHISPORT=`expr $CHECKTHISPORT + 1`
func_checker
else
   echo "$CHECKTHISPORT is available!"
fi
}
func_checker

 

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rev(1)								   User Commands							    rev(1)

NAME
rev - reverse the characters or lines of one or more files SYNOPSIS
/usr/bin/rev [-l] [file ...] DESCRIPTION
rev copies one or more files to standard output, reversing the order of characters on every line of the file. OPTIONS
The following options are supported: -l Reverse the order of the lines of the file, instead of characters. --line OPERANDS
The following operands are supported: file Specifies the name of the file to use as input. If file is not specified, or if file is a -, rev copies from standard input starting at the current offset. EXIT STATUS
The following exit values are returned: 0 All files copied successfully. >0 One or more files did not copy. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ SEE ALSO
cat(1), ksh93(1)tail(1), attributes(5) SunOS 5.11 27 Jan 2009 rev(1)
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