04-25-2008
shellscript
[CODE][
#!/bin/sh
choice=0
if [ $# -eq 1 -o $# -eq 2 ]; then
if [ -d $1 ];then
while [ $choice -ne 4 ]; do
clear
echo "" > temp
echo " MENU "
echo "1. display information"
echo "2. perform arimethic operation"
echo "3. find the first alphabetic letter from the input"
echo "4. exit the program"
echo "5. please enter your choice(1-4 only)"
read choice
if [ $choice -eq 1 ]; then
cd $1
if [ $# -eq 2 ]; then
if [ -f $2 ]; then
(cal -3; pwd; (ls -l | sort -r +8 -9)) > $2
else
(cal -3; pwd; (ls -l) | sort -r +8 -9) > $2
fi
else
cal -3
pwd
ls -l | sort -r +8 -9
fi
elif [ $choice -ne 1 ]; then
case $choice in
"2") echo "please enter 2 numbers and a choice of operation(A,S,M,D)"
read inp1 inp2 cho
(echo inp1 > inp1.f; echo inp2 > inp2.f)
if inpr1=`grep -w [0-9] inp1.f` -o inpr2 =`grep -w [0-9] inp2.f` ; then
case $cho in
"A") result=`expr $inp1 + $inp2`
echo $result;;
"S") result=`expr $inp1 - $inp2`
echo $result;;
"M") result=`expr $inp1 \* $inp2`
echo $result;;
"D") result=`expr $inp1 / $inp2`
echo $result;;
*) echo please enter the right choice;;
esac
else
echo invalid number
fi ;;
"3") echo "please enter an alphabet"
input3=1
echo "" > temp
while [ "$input3" != "0" ]; do
read input3
echo $input3 > check
if [ "$input3" != "0" ]; then
if check1=`grep -w "[a-z]" check` ; then
echo $input3 >> temp
else
echo input should be lower case alphabet
fi
fi
done
grep -w "[a-z]" temp > temp1
echo the first letter in alphabetic order is `sort temp1 | head -1`;;
"4") echo "do you really want to exit(y/n)?"
read input
if [ "$input" = "y" -o "$input" = "Y" ]; then
echo end of file,thanks for using the menu
elif [ "$input" = "n" -o "$input" = "N" ]; then
choice=1
else
echo invalid choice
choice=1
fi;;
*) echo "you have enter wrong input";;
esac
fi
if [ $choice -ne 4 ]; then
echo please press enter to continue
read a
fi
cd ../
done
fi
fi]
the argument is ./menu work input
work is in my current directory and the directory exists
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LEARN ABOUT ULTRIX
escape
escape(1) Mail Avenger 0.8.3 escape(1)
NAME
escape - escape shell special characters in a string
SYNOPSIS
escape string
DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result.
EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string:
$ var='; echo gotcha!'
$ eval echo hi $var
hi
gotcha!
$
Using escape, one can avoid executing the contents of $var:
$ eval echo hi `escape "$var"`
hi ; echo gotcha!
$
A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For
example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient:
#!/bin/sh
formail -x to -x cc -x resent-to -x resent-cc
| fgrep "$1" > /dev/null
&& exit 0
echo "<$1>.. address does not accept blind carbon copies"
exit 100
To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt
script:
bodytest reject_bcc `escape "$RECIPIENT"`
SEE ALSO
avenger(1),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 escape(1)