Convert all text in a file from upper-case to lower-case
Answer:
Just one command needed:
# tr '[:upper:]' '[:lower:]' < input.txt
Jan 272012
Linux Ask!
Jan 262012
Install bash completion for Mac OSX
Answer:
Bash completion (bash-complete) is a tool that allow you to auto complete commands and their arguments easily using the "tab" keys.
Firstly, make sure you have installed Homebrew, then
# brew install git bash-completionAnd add the following lines in your ~/.bash_profile
if [ -f `brew --prefix`/etc/bash_completion ]; then
. `brew --prefix`/etc/bash_completion
fiRestart your terminal and now you can see the effect of bash complete by tabbing..
Jan 232012
Move cursor to the end of file in VIM
Answer:
To move to the end of a file in VIM, type
G
Jan 202012
Removed opened port in ufw
Answer:
If you have opened a port using the ufw command in Ubuntu, but now you want to delete it, you can..
# sudo ufw delete allow 8080/tcp
And then do a reload
# # sudo ufw reload
That's all.
Jan 172012
How to perform a reverse DNS lookup in Linux
Answer:
To perform a reverse DNS lookup for a domain in Linux, you can use the dig command, e.g.
# dig -x 8.8.8.8
; <<>> DiG 9.7.0-P1 <<>> -x 8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59808
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;8.8.8.8.in-addr.arpa. IN PTR
;; ANSWER SECTION:
8.8.8.8.in-addr.arpa. 86328 IN PTR google-public-dns-a.google.com.
..
