*********UNIX/LINUX******** Ping wrapper . Call the script: myping Develop basic

Question

*********UNIX/LINUX********

Ping wrapper. Call the script: myping

Develop basic script

# implement the following syntax:

myping -p npack -h host1 [ host2   host3 ... ]
(the [] brackets indicate optional parameters).

# a "Usage" message stored in a variable (this is usually the command syntax).

# at least one function, including an error function that will print out whatever text is supplied to it as arguments and exit with a non-zero exit status.

# the use of an "if" statement to check for correct number of arguments. If the number is incorrect, it calls the error function to display the Usage message and exit.

# argument handling: At least four arguments are required.

* the first argument should be "-p" followed by the number of packets to send

* the third argument should "-h" followed by at least one hostname.   There can be any number of hostnames separated by spaces (this makes "getopts" unusable for this part).

# the use of a "for" or a "while" loop. For each host make just one call to ping.

# a way to filter the ping results for each host to display JUST the Statistics or Error Messages.

# remove any temporary files at the end.

Explanation / Answer

#!/bin/bash
# A shell script to start / stop / restart nfsv4 services
_me=${0##*/}              #Who am I? Server or client?
_server="/etc/init.d/rpcbind /etc/init.d/rpcidmapd /etc/init.d/nfslock /etc/init.d/nfs" # list of server init scripts
_client="/etc/init.d/rpcbind /etc/init.d/rpcidmapd /etc/init.d/nfslock" # list of client init scripts
_action="$1"            # start / stop / restart

# run all scripts with one action such as stop or start or restart
runme(){
   local i="$1"
   local a="$2"
   for t in $i
   do
       $t $a
   done
}

usage(){
   echo "$_me start|stop|restart|reload|status";
   exit 0
}

[ $# -eq 0 ] && usage

# main logic - take action
case $_me in
   nfs.server) runme "$_server" "$_action" ;;
   nfs.client) runme "$_client" "$_action" ;;
   *) usage
esac

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.