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can anyone explain me what is the difference between echo and print in shell programming?

Hi
I am new to shell programming, can anyone explain me the following syntax...
it could be helpful if it was brief...

if [ $(ps -ef | grep -e "$0 $*" | grep -c -v -E "(grep|$$)") -gt 0 ]

i have got a code set in which there is a file called .SetLib and was given as the library file for the code set.
can the functions in the .SetLib can be called from the files in the codeset?

Thanks for ur help

can anyone explain the code for me... i am new to shell programming

while getopts ":S:D:U:" OPTION "$@"
do
case $OPTION in
S) SRVR=$OPTARG;;
D) DB="$OPTARG"; USEDB="use $OPTARG";;
...

Thanks for ur help

export check=$(expandname $(dirname $(which $0)))

Hi it will be very useful for me if anyone gives step by step explanation for the below code:

USAGE="check -S dbserver [-D dbname] [-U userid]
where
-S dbserver specifies name of database...

Hi I am new to shell script programming...
want to know the process of the following:

if[ -n "$MISSINGOPTARG"]
then
echo "$0: missing argument for option(s) :$MISSINGOPTARG"
echo "usage"...