How to read from a file line by line and do stuff - Shell Programming and Scripting

spaceship · #1 (**permalink**) 03-17-2005

I want to read from a file and then do some stuff based on the text read from each line. Basically it is a list of usernames and I need to read each user, check it exist in passwd and extract their home directory and then copy a few files to that users home directory. Then move onto the next user in the file. Is this possible ??

dangral · #2 (**permalink**) 03-17-2005

for i in `cat filename.txt`
do
grep $i /etc/passwd
etc
etc
done

tmarikle · #3 (**permalink**) 03-17-2005

Quote:

Originally Posted by spaceship

I want to read from a file and then do some stuff based on the text read from each line. Basically it is a list of usernames and I need to read each user, check it exist in passwd and extract their home directory and then copy a few files to that users home directory. Then move onto the next user in the file. Is this possible ??

Here's a quick and sloppy way of doing it in KSH.

Code:

{
typeset IFS='
'
while read USER_NAME
do
   USER_DIR=$(grep $USER_NAME /etc/passwd | awk -F: '{print $6}')                                                                                                 
   print $USER_DIR                                                                                                                                                 
done < /etc/passwd
}

spaceship · #4 (**permalink**) 03-17-2005

Thank you both for your help. Sorted

chaandana · #5 (**permalink**) 03-17-2005

This will do

FileName='specify your file here'
while read LINE
do
echo $LINE
#do your stuff here
done < $FileName

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