Shell Programming and Scripting

Hi guys,

Completely new to all this and finding it soooooooo hard. Any help appreciated.

The idea is to check a list of .conf files and maintain a hash, if it does not match its hash it needs to do some more stuff, but I can't even get this first bit sorted... No idea if any of this is right. ><!

Code:

#!/bin/bash

sum1=`md5sum *.conf | awk '{print $1}'`
sleep 10
sum2=`md5sum *.conf | awk '{print $1}'`

for file in *.conf
do
if [`"sum1" -ne "$sum2"`] then
	echo "$file blah"
else
	echo "$file no blah"
fi
done

Syntax errors :

Code:

if [`"sum1" -ne "$sum2"`] then
.....

should be i guess

Code:

if [[ "$sum1" -ne "$sum2" ]]; then
....

Also you might want to check md5sum -c option and/or cmp utility.

Hi thanks for the help, removing the ` from there helped. Though the double brackets still gave a syntax error. I changed it back to single brackets and that worked fine. Any idea why?

Also changed this bit...

Code:

sum1=`md5sum *.conf | awk '{print $1}'`
sleep 10
sum2=`md5sum *.conf | awk '{print $1}'`

to:

Code:

sum1=$(md5sum *.conf)
sum2=$(md5sum *.conf)

Oh and changed the -ne to a "=" for string comparison... And retyped the script. (For some reason that fixed the first syntax error I got)
------------------------------------------------------

This is what I have now:

Code:

#!/bin/bash

sum1=$(md5sum *.conf)
sum2=$(md5sum *.conf)

for file in *.conf
do
if [ "$sum1" = "$sum2" ]; then
	echo "Passed"
	exit
else
	echo "Fail"
fi
done

So now I'm getting all "Fails" although I know they should be passing, using it as I have it here as well as using the -c option you mentioned and comparing it to previous output saved in a text file. May it be an issue because I'm not using actual .conf files??? I mean I just made some .txt files and pop some words in there.

With CMP, can you compare the existing file to the md5sum *.conf commands output? Ideally I want to be able to run it in the script without too many text files all about the place.

This is hard!

Try this to monitor for change in md5sum in working directory.

Code:

cd $WORKDIR
md5sum *.conf > md5 
sleep 10
md5sum -c md5 2>/dev/null  | awk -F":" '/FAILED/ { print $1 } '

This will print out the files that have changed since the initial md5sum.
You can then use that for further processing.

ILY I can finally get on with the rest of the script. Slapped that into a function and everything I've been trying to get working for the last 8 hours works.

Though honestly I have -NO- clue what

Code:

md5sum -c md5 2>/dev/null  | awk -F":" '/FAILED/ { print $1 } '"

this bit does. :P

Check manual of md5sum and output redirection in unix for better understanding.