22.8. User interfaces

22.8. User interfaces
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例 22.8. Using select to make simple menus

#!/bin/bash
OPTIONS="Hello Quit"
select opt in $OPTIONS; do
    if [ "$opt" = "Quit" ]; then
     echo done
     exit
    elif [ "$opt" = "Hello" ]; then
     echo Hello World
    else
     clear
     echo bad option
    fi
done

例 22.9. Using the command line

#!/bin/bash
if [ -z "$1" ]; then
    echo usage: $0 directory
    exit
fi
SRCD=$1
TGTD="/var/backups/"
OF=home-$(date +%Y%m%d).tgz
tar -cZf $TGTD$OF $SRCD

例 22.10. Reading user input with read

In many ocations you may want to prompt the user for some input, and there are several ways to achive this. This is one of those ways:

#!/bin/bash
echo Please, enter your name
read NAME
echo "Hi $NAME!"

As a variant, you can get multiple values with read, this example may clarify this.

#!/bin/bash
echo Please, enter your firstname and lastname
read FN LN
echo "Hi! $LN, $FN !"

22.8.1. input

例 22.11. read

限時30秒內，輸入你的名字

$ read -p "Please input your name: " -t 30 named
Please input your name: neo

$ echo $named

		
READ_TIMEOUT=60
read -t "$READ_TIMEOUT" input

# if you do not want quotes, then escape it
input=$(sed "s/[;\`\"\$\' ]//g" <<< $input)

# For reading number, then you can escape other characters
input=$(sed 's/[^0-9]*//g' <<< $input)

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22.7. Functions	起始頁	22.9. subshell