That works nicely!
Any idea how to make it so that it starts reading/printing on the third line?
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Question
Bash script to parse line by line
I have a file with the following format:
d 28854 cpmnt open username owner 3 062 description of problem
d 28855 cpmnt open username owner 3 062 description of problem
d 28859_d cpmnt open username owner 3 062 description of problem
I need to "grab" the second token of every line, no matter how large the token is. The 2nd token is characterized by whitespace delimerters on both sides. (generally spaces, but I would like to be able to handle tabs as well).
I would like generate a new file and insert onto each line the 2nd token from this first file.
This is a fun programming excercise. I have been working on it for a little while now, but just do not know the commands wlel enough to be able to get it where i need it to be.
The faster the response on this, the more points I will add to the question, and the better grade I will offer. Please help!
Here is the relevant portion of the script that I have so far (not a big deal at all)
It simply reads in the file line by line and outputs it to the terminal
# START OF SCRIPT
exec < currentDefectsLog
while read line
do
echo $line
done
#END OF SCRIPT
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Answers
Don't know that this is the best way but you could set an accumulator and increment it
x=1
exec < currentDefectsLog
while read line
do
if [ $x -gr 1 ]
then
echo $line | awk '{ print $2 }'
fi
x=(($x + 1))
done
that will get you to start at line 2
Then to stop at the second line from the end we can do this
filelinecount=` wc - l | cat currentDefectsLog`
then inside the while we can do this
exec < currentDefectsLog
while read line
do
if [ $x -gr 1 ]
then
echo $line | awk '{ print $2 }'
fi
if [ $x -eq (($filelinecount - 2)) ]
then
exit 0
fi
x=(($x + 1))
done
put it all together and I think that will take care of it.
Let me know if you require additional help.
Paul
That is the way I check my directories.
One thing I have learned though is there must be spaces between the braces and the test cirteria:
[ ! -d directory ]
If there are no spaces, things tend not to work.
Oh and another thing, in the code I gave you above you might need to change it a bit. I think the x=(($x + 1)) should probably be x=$(x + 1). Try it both ways.
Paul
Thank you for your continuous help. I will add more points as soon as soon as a refund comes in from an unanswered question.
How would I make the script do the following:
read a file line by line where each line is a single token of alphanumeric characters, and "_" characters
**trim white spaces from line**
if line is NOT blank then
if directory /defects/$line exists then
delete /defects/$line
fi
fi
done
I tried doing this:
#---start of script
while read line
do
line= echo $line | awk '{print $0}'
if [ -n $line ]
then
if [ -d "/defects/$line" ]
then
rm /defects/$line -f -r
fi
fi
done
#--- end of script
it almost works - except one thing. if it encounters a line with just whitespace on it, it will delete the /defects directory - when I never want that deleted as it is. i want to skip all blank lines.
ill have a shorter one for you
#!/bin/bash
#start
#Usage ./scriptname <file>
#Gives you the total number of lines in the file
nrow=`wc -l $1 | awk '{print $1}'`
#Nr or rows to tail the file with all rows - 3
rowtail=$(($nrow - 3))
#Nr or rows to head the file with all rows - 2
rowhead=$(($rowtail - 2))
#Output the right fields
tail -n $rowtail $1 | head -n $rowhead | awk '{ print $2 }'
#end
/Rob
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by: PaulS_IIIPosted on 2004-05-04 at 08:51:20ID: 10987933
try:
echo $line | awk '{ print $2 }'
That should work for ya
Paul