solab1pb4

#!/bin/bash

if [ $# -ne 2 ]; then
    echo "Usage: $0 <dir> <char>"
    exit 1
fi

dir=$1
char=$2

if [ ! -d $dir ]; then
    echo "$dir isn't a dir"
    exit 1
fi

list=$(find $dir -type f -name *.txt)

for file in $list
do
    chmod a+$char $file
done