Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
I need to write a script that accepts 3 filenames as command line parameters and test if they are executable and print a message saying whether or not they are, and I need to use a loop.
2. Relevant commands, code, scripts, algorithms:
3. The attempts at a solution (include all code and scripts):
My first attempt works great... but I didn't use a loop
I check to see if you have entered more or less then 3 files to test, displaying errors if you didn't and then test if each file exsists, then test if it is executable.
what my real question is how do I display a different parameter in a loop? I missed the "looping" class as my kid was sick, and we don't use the course book as it's crap.
any help would be great
Code:
if [ $# -le 2 ]
then
echo "You need to enter 3 files, you only entered $# "
exit
fi
if [ $# -ge 4 ]
then
echo "Enter 3 files only, you entered $# "
exit
fi
if [ -e "$1" ]
then
echo > /dev/null
else
echo $1 DOES NOT EXSIST!
fi
if [ -e "$2" ]
then
echo > /dev/null
else
echo $2 DOES NOT EXSIST!
fi
if [ -e "$3" ]
then
echo > /dev/null
else
echo $3 DOES NOT EXSIST!
exit
fi
if [ -x "$1" ]
then
echo $1 is executable
else
echo $1 is not executable
fi
if [ -x "$2" ]
then
echo $2 is executable
else
echo $2 is not executable
fi
if [ -x "$3" ]
then
echo $3 is executable
else
echo $3 is not executable
fi
4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Baker college, Flint, MI, USA, VScott, intro to shell scripting
Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
---------- Post updated at 10:43 PM ---------- Previous update was at 09:46 PM ----------
i figured it out, just used a for loop, works like a charm
Code:
if [ $# -le 2 ]
then
echo "You need to enter 3 files, you only entered $# "
exit
fi
if [ $# -ge 4 ]
then
echo "Enter 3 files only, you entered $# "
exit
fi
for i in $1 $2 $3
do
if [ -e "$i" ]
then
echo > /dev/null
else
echo ONE OR MORE FILES DO NOT EXSIST!
exit
fi
done
for j in $1 $2 $3
do
if [ -x "$j" ]
then
echo $j is executable
else
echo $j is not executabe
fi
done
Moderator's Comments:
edit by bakunin: Congrats on figuring that one out. To celebrate the occasion i ordered a ton of brand new CODE-tags and used two pairs to decorate your code with them. A few more (a gazillion or so) i left here for your own usage as a present - use them wisely. ;-))
Last edited by bakunin; 05-04-2011 at 04:59 AM..
Reason: Code tags, *sighs*
Two comments:
First, your user might appreciate knowing which file(s) don't exist by specifically naming it/them in your message. In the case of three inputs that's not too big of a task for the user to track down, but for a real-world programme, with hundreds or thousands of files to check, I would think it would be advantageous to have a list of specifically what doesn't exist.
Secondly, you might also want to look into using the not (!) operator with your logic:
Code:
if [ -e "$i" ]
then
echo > /dev/null
else
echo ONE OR MORE FILES DO NOT EXSIST!
exit
fi
as it would help you to eliminate the echo > /dev/null. Psuedo code:
Code:
if ! exists $f
then
echo "file $f does not exist"
end
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