Reading file in while loop bash scripting - bash

Question

I've got this code which reads an example file of /etc/passwd:
#!/bin/bash
OLDIFS=$IFS
IFS=$'\n'
while read linea resto
do
echo $linea
echo $resto
if [[ $(echo $linea | cut -d: -f6 | egrep -c 'al-03-04') == 1 ]]
then
finger $(cut -d: -f1) 2> fich
if [[ $(egrep -c fich) == 1 ]]
then
echo $(echo $linea | cut -d: -f1). Inactive user
else
echo $(echo $linea | cut -d: -f1). Active user
fi
fi
done < <(cat fichpasswd)
IFS=$OLDIFS
and this is the example file of /etc/passwd:
jfer:x:5214:1007:Javier Lopez,,,:/home/al-03-04/jfer:/bin/bash
jperez:x:10912:1009:Juan Perez,,,:/home/al-03-04/jperez:/bin/bash
mfernan:x:10913:1009:Manuel Fernandez,,,:/home/al-02-03/mfernan:/bin/bash
The problem is that the while loop only reads the first line, ignoring the others. The script's output is:
jfer:x:5214:1007:Javier Lopez,,,:/home/al-03-04/jfer:/bin/bash
jfer. Active user

Answer 1

You could try something like :
#!/bin/bash
FILE="test.txt"
while IFS=":" read -a data; do
echo "${data[#]}"
if [[ $(echo ${data[5]}|egrep -c 'al-03-04') -eq 1 ]]; then
if [[ $(finger "${data[0]}" 2>&1) =~ "no such user" ]]; then
echo "${data[0]}. Inactive user"
else
echo "${data[0]}. Active user"
fi
fi
done < "$FILE"
Here's the output :
ineumann ~ $ cat test.txt
ineumann:x:5214:1007:Javier Lopez,,,:/home/al-03-04/jfer:/bin/bash
jperez:x:10912:1009:Juan Perez,,,:/home/al-03-04/jperez:/bin/bash
mfernan:x:10913:1009:Manuel Fernandez,,,:/home/al-02-03/mfernan:/bin/bash
ineumann ~ $ ./test.sh
ineumann x 5214 1007 Javier Lopez,,, /home/al-03-04/jfer /bin/bash
ineumann. Active user
jperez x 10912 1009 Juan Perez,,, /home/al-03-04/jperez /bin/bash
jperez. Inactive user
mfernan x 10913 1009 Manuel Fernandez,,, /home/al-02-03/mfernan /bin/bash
A few comments on your script :
No need to use cat to read your file in a loop.
finger $(cut -d: -f1) 2> fich : cut need an input. And no need to use a temporary file to catch the output of finger (moreover this is not thread safe).
No need to use cut in your script when you choose the right IFS to split a line in multiple parts. In your case, I think the smartest choice would be :.
You can change the IFS only inside the loop with the syntax while IFS=':' read; do ...; done. No need to re-assign IFS with OLDIFS.
You can also use the while IFS=':' read var1 var2 var3 trash; do ...; done syntax to avoid to use an array with read -a (but I'd prefer to use an array as I wrote in my version of your script).