Answer:

To remove newly added files or directories under a Git repository (but un-staged yet), do:

# git clean -fdn

Check if the files/directories are really okay to remove. Then, execute the command again without the '-n'

# git clean -fd

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Answer:

To move to the end of a line in VIM, type

$

You can also type "A" to append at end of the line.

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Answer:

Just one command needed:

# tr '[:upper:]' '[:lower:]' < input.txt

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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-completion

And add the following lines in your ~/.bash_profile

if [ -f `brew --prefix`/etc/bash_completion ]; then
    . `brew --prefix`/etc/bash_completion
fi

Restart your terminal and now you can see the effect of bash complete by tabbing..

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Answer:

To move to the end of a file in VIM, type

G

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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.

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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.

..

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Answer:

To get the MD5 checksum of a file under Mac OSX, like the md5sum command in Linux, you can use:

# md5 my-file.zip

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Answer:

To un-compress a Java Web Archives file (*.war), you can use the command

# jar xvf my-app.war

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Answer:

To import a private key e.g. key.p12 into your login keychain, use the command:

# security import key.p12 -k ~/Library/Keychains/login.keychain

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