mkdir if not exists in linux/unix

mkdir creates a directory if it does not exist, we can use the mkdir -p option. syntax: mkdir -p foo/bar/baz, will create directories foo, foo/bar,...

How to grep ignore case in linux/unix

In linux/unix, we can use the grep -i option to ignore case matching search keywords. grep ignore case syntax: grep -i "keyword" file...

linux view apache logs

In Linux, apache logs (error logs and access logs) provide useful information for system administrators to solve and locate problems....