💾Regex

Regular Expressions

Basic Tricks

• Look at uncommented lines from a file:

cat example | grep -Ev "^#" | grep .

• Extracts only the text inside the quotes from a file:

sed 's/"\([^"]*\)"/\1/g' filename

• Converting Windows-style line endings to Unix-style line endings:

sed -i 's/\r$//' file.sh

• Execute a script on a loop until a condition is meet:

until ! ./poc.sh | grep -q "[x] ERROR"; do :; done; echo "No ERROR found, script finished successfully."

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Making Wordlists

• Create wordlists for users and passwords from a dump file. The following code extracts the first (usernames) and fourth (password hashes) fields, which are separated by colons (:), and saves them into separate files:

awk '{print $1}' FS=':' dump.txt > users.txt
awk '{print $4}' FS=':' dump.txt > hashes.txt