$ cat /etc/passwd | cut -f1,2 -d':'
 $ cat /etc/passwd | awk -F': ' '{print $1":"$2;}'
# Y si lo que necesitas son mas de un caracter de delimitador cambia a -F' : '

#!/usr/bin/expect
set timeout 20
set ip [lindex $argv 0]
set port [lindex $argv 1]
set user [lindex $argv 2]
set password [lindex $argv 3]
 
spawn telnet $ip $port
expect "'^]'."
sleep .1;
send "\r";
expect
{
  "login:"
  {
        send "$user\r"
        expect "Password:"
        send "$password\r";
        interact
 
  }
 
  "host: Connection refused"
  {
    send_user "ERROR:EXITING!"
    exit
  }
 
}

http://stackoverflow.com/questions/7789710/expect-script-to-automate-telnet-login

#!/bin/sh
PROCESS_LIST_FILE=`mktemp`
PARSED_PROCESS_LIST_FILE=`mktemp`
GRAPH_SIZE=10
DOTS='****************************************************************************************************'
 
trap control_c SIGINT
 
control_c(){
    rm -f $PROCESS_LIST_FILE
    rm -f $PARSED_PROCESS_LIST_FILE
    echo 'Bye!'
    stty echo
    tput cvvis
    exit 5
}
 
f_watch_watcher(){
    tput clear
    tput civis
    stty -echo
    while :; do
        i=0
        for pid in $PID_LIST; do
            if [[ -d /proc/$pid ]]; then
                tput cup $i 0
                CURRENT_VALUE=`ps h -p $pid -o $PS_STRING`
                echo -n "$DOTS" "$CURRENT_VALUE"
                tput cup $i 0
                ((CURRENT_VALUE++))
                case $CURRENT_VALUE in
                    [0-9]|[1-2][0-9]|3[1-3])color='\e[0;32m';;
                    3[4-9]|[4-5][0-9]|6[0-6])color='\e[0;33m';;
                    6[7-9]|[7-9][0-9]|100)color='\e[0;31m';;
                esac
                echo -ne $color
                NOTDOT=`seq -s "+" $CURRENT_VALUE | sed 's/[0-9]//g'`
                echo -en $NOTDOT'\e[0m'
            else
                tput cup $i 0
                echo -n 'PID dead: '$pid
            fi
            ((i++))
         done
    done
    exit 4
}
 
f_what_watch(){
    select optionC in "CPU" "Memory" "CPU Time" "State"; do
        case "$optionC" in
            "CPU")
                PS_STRING='c'
                break
            ;;
            *)
                echo -e '501 Not implemented\nGo away!'
                exit 5
            ;;
        esac
    done
}
 
f_get_pidlist(){
    # TODO: Add warning if PID was selected before OR
    #       Remove PID from list
    select optionB in `cat $PARSED_PROCESS_LIST_FILE` "Done"; do
        case $optionB in
            "Done")
                # Catch empty PID_LIST
                [[ x"$PID_LIST" == 'x' ]] && echo 'You did not select any PID...' && control_c
                break # Exits select loop
            ;;
            *)
                # Catch first PID
                if [[ x"$PID_LIST" == 'x' ]]; then
                    PID_LIST=$optionB
                else
                    PID_LIST="$PID_LIST"' '"$optionB"
                fi
            ;;
        esac
    done
}
 
f_select_pid(){
    cat $PROCESS_LIST_FILE | cut -f1 -d' ' | tr ' ' '-' > $PARSED_PROCESS_LIST_FILE
}
 
f_select_filter(){
    select optionA in "PID - Process ID" "USER - User name" "COMM - Command"; do
        case $optionA in
            "PID - Process ID")
                f_select_pid # Return $PARSED_PROCESS_LIST_FILE
                break # This is for the select loop
            ;;
            "USER - User name"|"COMM - Command")
                echo -e '501 Not implemented\nGo away! '$optionA
                exit 3
            ;;
            *)
                echo 'Error!'
                exit 3
            ;;
        esac
    done
}
 
f_get_psfile(){
    ps h -o pid,user,comm \
      -N --ppid 2 -p 1,2 \
      | column -t | tr -s ' ' | cut -f1,2,3 -d ' '> $PROCESS_LIST_FILE
}
 
f_get_psfile    # Return $PROCESS_LIST_FILE
f_select_filter # Return $PARSED_PROCESS_LIST_FILE
f_get_pidlist   # Return $PID_LIST
f_what_watch    # Return $PS_STRING
f_watch_watcher # Shows nice graphs
 
control_c
 

#!/bin/sh
PROCESS_LIST_FILE=`mktemp`
PARSED_PROCESS_LIST_FILE=`mktemp`
GRAPH_SIZE=10
 
trap control_c SIGINT
 
control_c(){
    rm -vf $PROCESS_LIST_FILE
    rm -vf $PARSED_PROCESS_LIST_FILE
    echo 'Bye!'
    exit 5
}
 
f_watch_watcher(){
    while [[ -d /proc/$optionB ]]; do
        CURRENT_VALUE=`ps h -p $optionB -o $PS_STRING`
        let "CURRENT_VALUE %= $GRAPH_SIZE"
        CURRENT_VALUE=$((CURRENT_VALUE + 2))
        clear
        seq -s "+" $CURRENT_VALUE | sed 's/[0-9]//g'
        sleep 1
        clear
    done
    exit 4
}
 
f_get_watch(){
    select optionC in "CPU" "Memory" "CPU Time" "State"; do
        case "$optionC" in
            "CPU")PS_STRING='c';f_watch_watcher;;
            *)echo -e '501 Not implemented\nGo away! '$optionC; exit 3;;
        esac
    done
}
 
f_show_parsed(){
    select optionB in `cat $PARSED_PROCESS_LIST_FILE` "Done"; do
        case "$optionB" in
            "Done")exit;;
            *) f_get_watch; exit 2 ;;
        esac
    done
}
 
f_select_pid(){
    cat $PROCESS_LIST_FILE | cut -f1 -d' ' | tr ' ' '-' > $PARSED_PROCESS_LIST_FILE
    f_show_parsed
}
 
ps fh -o pid,user,comm \
      -N --ppid 2 -p 1,2 \
      | awk '$3 !~ /^[|\\]/ { print $1" "$2" "$3 }' > $PROCESS_LIST_FILE
 
select optionA in "PID - Process ID" "USER - User name" "COMM - Command"; do
    case "$optionA" in
        "PID - Process ID")f_select_pid;;
        *)echo -e '501 Not implemented\nGo away! '$optionA; exit 1;;
    esac
done
 
control_c