• echo "hello world"
• pwd
• ls
• cat access.log
• tail -n 5 access.log
• grep "GET" access.log
• grep -c -P '\t' file-with-tabs.txt
• grep -l 500 *
• ls | grep 'access.log*'
• find . -type f -name "access.log*" -exec grep -hP '500' {} \;
• find . -type f -name "access.log*" -exec grep -oP '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}' {} \;
• ???
• ???
• cat access.log | sort
• ???
• ???
• ???
• rm -- -*rm
• find . -type f -name "*.doc" -exec rm {} \;
• ???
• find . -type f -name "*.txt" -exec sed -i 's/challenges are difficult//g' {} \;
• ???
• find . -type f -exec basename {} \;