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 !"
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)