Shell Programming and Scripting

sriram] var="0 0 0 0"
sriram] echo $var | grep -qv 0
sriram] $?
ksh: 1:  not found.
sriram] var="0 0 0 127"
sriram] echo $var | grep -qv 0
sriram] $?
ksh: 1:  not found.

#Command execution function
_Command()
{
   _Report "BEGIN Command : $@ "
    #Executing command and redirecting stderr to devnull
    output=$(eval $@)
    #Exit status of the command
    stat=$?
    echo $output
    echo "++ $stat ++"

    if [[ $stat -ne 0 ]] ; then
        #collecting all return codes of commands into a variable
                Returns=$Returns" "$stat
        _Report "$@ not successful"
        _Report "END"
    else
                Returns=$Returns" "$stat
        _Log "$output"
        _Report "END"
    fi
}

#List of commands to be run for unix swap space problem

        _Report "##  memory size used by each of the running processes ##"
        _Command 'ps -eo vsz,pid,args | sort -n'

    _Report "## memory that is locked but not used ##"
    _Command 'ipcs -ma | grep -w -E "0|NATTCH" '

        _Report "## Check for virtual memory statistics ##"
        _Command "vmstat"

        _Command "ps -ef | grep micro"


#Search for nonzero code in all the exitcodes of commands
echo $Returns
echo $Returns | grep -qv 0

#If one of the commands fail, autocheck script will return 16
[ $? = 1 ] && exit $Error || exit $Success

var="0 0 0 0"
echo $var | grep -q "0 0 0 0"
echo $?
0

var="0 0 0 127"
echo $var | grep -q "0 0 0 0"
echo $?
1

var="0 0 0 0"
echo $var | grep -qv "0 0 0 0"
echo $?
1

var="0 0 0 127"
echo $var | grep -qv "0 0 0 0"
echo $?
0

_flag=0
...
command  ... || _flag=16
...
command ... || _flag=16
....
exit $_flag

echo $var | sed 's/0//g' | grep -qv 0; echo $?

#If one of the commands fail, autocheck script will return 16
if  $var 2>/dev/null ; then
   exit $Success
else
   exit $Error
fi