Echo without a newline at the end
Answer:
Normally when you use the echo command to print a string, it will append a newline at the end of the string. To skip the newline, you can try using the "-n" argument.
# echo -n "hello"
Mar 242012
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.
..
Oct 052011
Exclude files when using the du to estimate disk usage
Answer:
It is easy to use du command to estimate disk usage, however, sometimes you want to ignore some files during the calculation.
To do so, try
# du -h --exclude='*.bak'
The above command will exclude all the file end with the extension .bak during the disk space calculation.
