summary.md

Summary of bash scripting

To get dirname without parents

${dir##*/}

To update variable in sub shell

Changing global vars in sub shell won't affect it's value in global context, like:

global_var=asdf
foo()
{
    global_var=$(echo 4321)
}

echo something | grep some_pattern | \
    while read line
    do
        foo
        echo $global_var
    done
echo $global_var

# outputs:
# 4321
# asdf

sub shell explination.

Finally I resigned to save that variable to a temporary file.