getopts tutorial in Shell Script
By: Vivek G
This shell script shows how to use getopts in shell script to get command line options in your own shell scripts. In this example, the following options are programmed.-c clear the screen -d show list of files in current working directory -m start mc (midnight commander shell) , if installed -e { editor } start this { editor } if installed
#
# Function to clear the screen
#
cls()
{
clear
echo "Clear screen, press a key . . ."
read
return
}
#
# Function to show files in current directory
#
show_ls()
{
ls
echo "list files, press a key . . ."
read
return
}
#
# Function to start mc
#
start_mc()
{
if which mc > /dev/null ; then
mc
echo "Midnight commander, Press a key . . ."
read
else
echo "Error: Midnight commander not installed, Press a key . . ."
read
fi
return
}
#
# Function to start editor
#
start_ed()
{
ced=$1
if which $ced > /dev/null ; then
$ced
echo "$ced, Press a key . . ."
read
else
echo "Error: $ced is not installed or no such editor exist, Press a key . . ."
read
fi
return
}
#
# Function to print help
#
print_help_uu()
{
echo "Usage: $0 -c -d -m -v {editor name}";
echo "Where -c clear the screen";
echo " -d show dir";
echo " -m start midnight commander shell";
echo " -e {editor}, start {editor} of your choice";
return
}
#
# Main procedure start here
#
# Check for sufficent args
#
if [ $# -eq 0 ] ; then
print_help_uu
exit 1
fi
#
# Now parse command line arguments
#
while getopts cdme: opt
do
case "$opt" in
c) cls;;
d) show_ls;;
m) start_mc;;
e) thised="$OPTARG"; start_ed $thised ;;
\?) print_help_uu; exit 1;;
esac
done
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