Linux – grep the specific date patterns

In some occasions Infinality font rendering can cause problems when loading the Display Manager.

http://forums.linuxmint.com/viewtopic.php?f=208&t=136307

If you have infinality installed and reconfiguring mdm doesn't works, try to:

sudo apt-get remove fontconfig-infinality

you can also reconfigure mdm as follows:

sudo dpkg-reconfigure mdm

this way it won't be necessary to install mdm again, task that may become hard

It might be easier if you use more than one line to do this. You could write a bash script:

#!/bin/bash

tail -f test.log | while read line; do
    if echo "$line" | grep -q "Error"; then
        echo "$line" >> error.log
    elif echo "$line" | grep -q "Warning"; then
        echo "$line" >> warning.log
    # The following is in case you want to print out lines that do not match 
    else
        echo "$line"
    fi
done