Grep huge number of patterns from huge file
I have a file that’s growing about 200,000 lines a day, and it is all formed with blocks of three lines as such:
Unix & Linux
Diagram of Linux kernel vs. performance tools?
Is there a diagram that shows how the various performance tools such as ip, netstat, perf, top, ps, etc. interact with the various subsystems within the Linux kernel?
Linux does not reply to ARP request messages if requested IP address is associated with another (disabled) interface
I have a PC(kernel 3.2.0-23-generic) which has 192.168.1.2/24 configured to eth0 interface and also uses 192.168.1.1 and 192.168.1.2 addresses for tun0 interface:
Kill all background jobs
Is there a more compact form of killing background jobs than:
Does “less” have a feature like “tail –follow=name” (“-F”)
The command less can be used to replace tail in
cp behaves weirdly when . (dot) or .. (dot dot) are the source directory
This answer reveals that one can copy all files – including hidden ones – from directory src into directory dest like so:
“Bookmarks” for bash
Navigating several layers of nested directories is often a pain. On Firefox, it is easy because they have bookmarks. So what I’d like to do to bookmarks a file is to type:
What does “rm is hashed” mean?
I’m going through http://mywiki.wooledge.org/BashGuide/CommandsAndArguments and came across this:
What is the email matching regex in basic regex for grep?
I created a text file and put some email addresses in it. Then I used grep to find them. Indeed it worked: