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Shell Programming and Scripting

problem with I/O script

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# 8  
Old 01-16-2008
Quote:
Originally Posted by cleansing_flame
i tried that, but i had to ctrl-c out, which may stop the process, but it still made the .txt file which didn't exist before
You have a logical problem. If option $1 don't exit option $2 became option $1 and in this case option $2 don't exist.
# 9  
Old 01-16-2008
Quote:
Originally Posted by danmero
You have a logical problem. If option $1 don't exit option $2 became option $1 and in this case option $2 don't exist.
so... would u suggest i put a second loop, or break statement to end it?

i'm trying to make it so that every time a person types a command in, it is is redirected. I could put in an if that needs a string which no one would guess as input. otherwise I don't see a way I can test this effectively or break out of it if i want to without using ctrl-c
# 10  
Old 01-16-2008
Quote:
Originally Posted by cleansing_flame
so... would u suggest i put a second loop, or break statement to end it?

i'm trying to make it so that every time a person types a command in, it is is redirected. I could put in an if that needs a string which no one would guess as input. otherwise I don't see a way I can test this effectively or break out of it if i want to without using ctrl-c
The script is stuck in an infinite loop due to the while. Change the while to an if statement if all you want is $2 sent to new.txt file. There is no need to loop for that.

Code:
if [ -n $1 ]
then
   $2>/Users/a/new.txt
fi

If $2 is not a UNIX command the "$2>/Users/a/new.txt" line should give you an error.
# 11  
Old 01-16-2008
Quote:
Originally Posted by cleansing_flame
#!/bin/sh

cd /
while [$1 -ne " "]
do
$2>/Users/a/new
done

blanker.sh: line 6: [: missing `]'
This script will check for $1 and $2, can you elaborate why you need the 'while' loop?
Code:
#!/bin/sh
if [ -z "$1" ] ; then
    echo "Option 1 & 2 are missing, exit now"; exit 1
elif [ -z "$2" ] ; then
    echo "Missing second option, exit now"; exit 1
else
    $2>/Users/a/new
fi

# 12  
Old 01-16-2008
I'm trying to trap a person in this loop so everything they type will not be read
# 13  
Old 01-16-2008
Quote:
Originally Posted by cleansing_flame
I'm trying to trap a person in this loop so everything they type will not be read
very strange requirements if you ask me. probably a shell script is not what you want.
# 14  
Old 01-16-2008
Quote:
Originally Posted by frank_rizzo
very strange requirements if you ask me. probably a shell script is not what you want.
your right it is weird, but i'd like to try it in .sh
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