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 8
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 4
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 5
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 5
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 6
Undo

Undo (sh, bash, tcsh)
This is sample output - yours may be different.
-2

[Ctrl+u]

PhillipNordwall · 2010-11-19 20:27:42 10
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 4
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 5
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 4

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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execute a shell with netcat without -e

Shorter version with proper stderr redirection .

Simple complete system backup excluding files or directories

You can exclude more system folders or individual files which are not necessary for the backup and can be recreated after the restore procedure, like /lost+found, /mnt, /media, /tmp, /usr ... Restoring the above backup procedure is as simple as becoming root and typing: $ tar zxpf backup.tgz -C / You can extract any file or directory out of the backup.tgz file for recovery, for instance, if you have a corrupt or mis-configured fstab file, you could simply issue the command: $ tar zxpf backup.tgz /ect/fstab -C / Other options: v add verbose option to see files processed A far safer solution is to restore the desired files under a different directory, and then compare, move, or update the files to their original locations afterward.

Find files of two different extensions and copy them to a directory

Find and remove core files

zsh suffix to inform you about long command ending

make, find and a lot of other programs can take a lot of time. And can do not. Supppose you write a long, complicated command and wonder if it will be done in 3 seconds or 20 minutes. Just add "R" (without quotes) suffix to it and you can do other things: zsh will inform you when you can see the results. You can replace zenity with other X Window dialogs program.

dont execute command just add it to history as a comment, handy if your command is not "complete" yet

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Check if you work on a virtual/physical machine in Linux

Command used to know if we are working on a virtual or physical machine. This command will use the dmidecode utility to retrieve hardware information of your computer via the BIOS. Run this command as root or with sudo.

Concatenate (join) video files

Use mencoder to concatenate (join) multiple video files together.

Open files in a split windowed Vim

-o acts like :spit. Use -O (capital o) for side-by-side like :vsplit. Use vim -d or vimdiff if you need a diff(1) comparison. To split gnu Screen instead of vim, use ^A S for horizontal, ^A | for vertical.

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