Setting letter as variable

Shell Programming and Scripting
1

I need to pass letter like "c" for "-copy" and need to read by variable $sel_mod, My I know the good way of writing the script.

Example:

Select one of the Clone Mode ( '-copy', '-differential', '-precopy', '-nopcopy')
Type the Clone mode : c

Thanks in advance,
Ashan

set_env1(){
clear
echo
echo
echo
echo
echo "      SETUP CLONE ENVIRONMENT "
echo
echo -e "\e[1;31m      Select one of the Clone Mode ( '-copy', '-differential', '-precopy', '-nopcopy' )\e[0m"
echo
echo -n "      Type the Clone mode           :"
read sel_mod
echo
echo -n "      Enter Array I.d (-sid)        :"
read sid
echo
echo -n "      Enter Clone Device Pair File  :"
read dev1
echo
echo
echo "    -------------------------------------------"
echo
echo -e "\e[1;34m      Entered Clone Mode is  : (*** $sel_mod ***) \e[0m"
echo
echo -e "\e[1;34m      Entered Array Id is    : (*** $sid ***) \e[0m"
echo
echo -e "\e[1;34m      Entered Clone File is  : (*** $dev1 ***) \e[0m"
echo
echo
echo "    -------------------------------------------"
echo
echo -e "\e[1;31m      Continue if entries are correct or go back to menu reselect.....!!! \e[0m"
echo

MOD=$sel_mod
ID=$sid
DFILE1=$dev1
DFILE2=$dev2
}
set_env1
2

Maybe this:

 
get_opt(){
OPTS=":-copy:-differential:-precopy:-nopcopy"
opt="${1#[-]*}${OPTS##*:-$1}"
opt="-${opt%%:*}"
opt="-${opt#[-]*}"
echo $opt
}
set_env1(){
clear
echo
echo
echo
echo
echo " SETUP CLONE ENVIRONMENT "
echo
echo -e "\e[1;31m Select one of the Clone Mode ( '-copy', '-differential', '-precopy', '-nopcopy' )\e[0m"
echo
echo -n " Type the Clone mode :"
read sel_mod
sel_mod=$(get_opt $sel_mod)
echo
echo -n " Enter Array I.d (-sid) :"
read sid
sid=$(get_opt $sid)
echo
echo -n " Enter Clone Device Pair File :"
read dev1
dev1=$(get_opt $dev1)
echo
echo
echo " -------------------------------------------"
echo
echo -e "\e[1;34m Entered Clone Mode is : (*** $sel_mod ***) \e[0m"
echo
echo -e "\e[1;34m Entered Array Id is : (*** $sid ***) \e[0m"
echo
echo -e "\e[1;34m Entered Clone File is : (*** $dev1 ***) \e[0m"
echo
echo
echo " -------------------------------------------"
echo
echo -e "\e[1;31m Continue if entries are correct or go back to menu reselect.....!!! \e[0m"
echo
MOD=$sel_mod
ID=$sid
DFILE1=$dev1
DFILE2=$dev2
}
set_env1
3

Thanks for your reply can you please explain the code and who it work.

get_opt(){
OPTS=":-copy:-differential:-precopy:-nopcopy"
opt="${1#[-]*}${OPTS##*:-$1}"
opt="-${opt%%:*}"
opt="-${opt#[-]*}"
echo $opt
}
4 
get_opt(){                                                   # define get_opt function
OPTS=":-copy:-differential:-precopy:-nopcopy"  # set the OPTS string variable
opt="${1#[-]*}${OPTS##*:-$1}"                    # find the matching string in OPTS using the $1 variable to the function
opt="-${opt%%:*}"                                       # remove the ":" to the end of string after the matching string
opt="-${opt#[-]*}"                                        # force "-" at beginning of opt string
echo $opt                                                     # return opt string
}
5

Issue is rest of the output also get hyphen mark, need to avoid hyphen shown below.

Entered Array Id is : (*** -4122 ***)
 
 Entered Clone File is : (*** -dev.txt ***)
----------------------------------------------------------------------------------------------
SETUP CLONE ENVIRONMENT
 
 Select one of the Clone Mode ( '-copy', '-differential', '-precopy', '-nopcopy' )
 
 Type the Clone mode :c
 
 Enter Array I.d (-sid) :4122
 
 Enter Clone Device Pair File :dev.txt
 
 
 -------------------------------------------
 
 Entered Clone Mode is : (*** -copy ***)
 
 Entered Array Id is : (*** -4122 ***)
 
 Entered Clone File is : (*** -dev.txt ***)
 
 
 -------------------------------------------
6

to remove hyphen:

replace line in get_opt function:

opt="-${opt#[-]*}"

with

opt="${opt#[-]*}"
7

Read up on getopts too.