Commands by PhillipNordwall

Commands by PhillipNordwall (9)

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Create a 5 MB blank file via a seek hole

Similar to the original, but is much faster since it only needs to write the last byte as zero. A diff on testfile and testfile.seek will return that they are the same.
This is sample output - yours may be different.
10

dd if=/dev/zero of=testfile.seek seek=5242879 bs=1 count=1

PhillipNordwall · 2011-04-04 17:56:47 2
Calculate 1**2 + 2**2 + 3**2 + ...

Simplified the series to a polynomial and send it to bc
This is sample output - yours may be different.
0

N=10; echo "($N*($N+1)*(2*$N+1))/6" | bc

PhillipNordwall · 2011-02-15 20:02:57 0
Find a CommandlineFu users average command rating
This is sample output - yours may be different.
4

wget -qO- www.commandlinefu.com/commands/by/PhillipNordwall | awk -F\> '/num-votes/{S+=$2; I++}END{print S/I}'

PhillipNordwall · 2010-12-29 22:35:28 1
Find a CommandlineFu users average command rating

This could be used to filter commands that might be from trolls Show Sample Output
This is sample output - yours may be different.
```
-0.8
```
1

curl -s www.commandlinefu.com/commands/by/PhillipNordwall | awk -F\> '/num-votes/{S+=$2; I++}END{print S/I}'

PhillipNordwall · 2010-12-29 22:34:22 1
Remove all .svn folders

Removing .svn directories without a pipe
This is sample output - yours may be different.
-1

find . -name .svn -type d -exec rm -rf {} \;

PhillipNordwall · 2010-12-15 18:51:08 2
Undo

Undo (sh, bash, tcsh)
This is sample output - yours may be different.
-1

[Ctrl+u]

PhillipNordwall · 2010-11-19 20:27:42 1
FInd the 10 biggest files taking up disk space
This is sample output - yours may be different.
1

find / -type f -size +100M -exec du {} \; | sort -n | tail -10 | cut -f 2

PhillipNordwall · 2010-11-09 18:34:49 0
Random unsigned integer

Grab 4 bytes from www.random.org over ssl and format them as an integer
This is sample output - yours may be different.
-1

curl -s "https://www.random.org/cgi-bin/randbyte?nbytes=4" | od -DAn

PhillipNordwall · 2010-11-09 18:26:24 0
find all file larger than 500M

Greater than 500M and sorted by size.
This is sample output - yours may be different.
1

find . -type f -size +500M -exec du {} \; | sort -n

PhillipNordwall · 2010-11-09 18:15:44 0

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Copy the sound content of a video to an mp3 file

-vn removes tha video content, the copy option tells ffmpeg to use the same codec for generating the output

Benchmark SQL Query

Benchmark a SQL query against MySQL Server. The example runs the query 10 times, and you get the average runtime in the output. To ensure that the query does not get cached, use `RESET QUERY CACHE;` on top in the query file.

Record and share your terminal

It replays plain text terminal screencast from http://shelr.tv/

list files recursively by size

Copy sparse files

This causes cp to detect and omit large blocks of nulls. Sparse files are useful for implying a lot of disk space without actually having to write it all out. http://en.wikipedia.org/wiki/Sparse_file You can use it in a pipe too: $ dd if=/dev/zero bs=1M count=5 |cp --sparse=always /dev/stdin SPARSE_FILE

Tail -f at your own pace

The -s option allows you to specify the update interval

Download entire website for offline viewing

?mirror : turn on options suitable for mirroring. -p : download all files that are necessary to properly display a given HTML page. ?convert-links : after the download, convert the links in document for local viewing. -P ./LOCAL-DIR : save all the files and directories to the specified directory.

Delete a file/directory walking subdirectories (bash4 or zsh)

Use all the cores or CPUs when compiling

Force make command to create as many compile processes as specified (4 in the example), so that each one goes into one core or CPU and compilation happens in parallel. This reduces the time required to compile a program by up to a half in the case of CPUs with 2 cores, one fourth in the case of quad cores... and so on.

Execute a command without saving it in the history

Prepending one or more spaces to your command won't be saved in history. Useful for pr0n or passwords on the commandline. Tested on BASH.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

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