Commands tagged xxd sorted by votes

Commands tagged xxd (6)

sorted by

Generate a Random MAC address

Use the following variation for FreeBSD: openssl rand 6 | xxd -p | sed 's/$..$/\1:/g; s/:$//'
This is sample output - yours may be different.
16

openssl rand -hex 6 | sed 's/$..$/\1:/g; s/.$//'

putnamhill · 2010-09-23 02:31:12 6
Binary injection

Replace (as opposed to insert) hex opcodes, data, breakpoints, etc. without opening a hex editor. HEXBYTES contains the hex you want to inject in ascii form (e.g. 31c0) OFFSET is the hex offset (e.g. 49cf) into the binary FILE
This is sample output - yours may be different.
2

echo -n $HEXBYTES | xxd -r -p | dd of=$FILE seek=$((0x$OFFSET)) bs=1 conv=notrunc

zombiedeity · 2009-03-11 17:02:24 361
Binary search/replace

Replace all instances of "A" with "B" in file "source" saved as file "destination". !! IF A/B is multi-byte, then separate bytes with spaces like so: "s/20\ 0A/00/g". Show Sample Output
This is sample output - yours may be different.
```
 
```
2

xxd -p source | fold -w2 | paste -sd' ' | sed "s/A/B/g" | xxd -p -r > destination

hincor · 2015-05-26 18:29:48 24
use xxd to create the wake on lan magicpacket and write to pcap file

just set macdst to the mac address of the system you wish to wake up, the macsrc is optional but helps use tcpreplay to broadcast or wireshark to view
This is sample output - yours may be different.
1

macdst="5873b856445f";macsrc="d2a791e1715a";pkt="d4c3b2a1020004000000000000000000ffff000001000000e3eab353fa1f 0b007400000074000000$macdst $macsrc 0842ffffffffffff";for i in {1..16}; do pkt="$pkt $macdst"; done; echo "$pkt" | xxd -r -p > magicpacket.pcap

unixmonkey77095 · 2014-07-02 17:37:44 7
print all characters of a file using hexdump

xxd can convert a hexdump back to binary using the -r option which can be useful for patching or editing binary files.
This is sample output - yours may be different.
0

xxd <file>

putnamhill · 2011-09-09 21:52:30 4
Function to check whether a regular file ends with a newline

end_w_nl filename will check if the last byte of filename is a unix newline character. tail -c1 yields the file's last byte and xxd converts it to hex format.
This is sample output - yours may be different.
0

end_w_nl() { [[ $(tail -c1 $1 | xxd -ps) == 0a ]] }

xro · 2012-09-18 20:11:29 6

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.

Share Your Commands

Check These Out

Watch contents of a file grow

In this case, I'm keeping an eye on /var/log/messages, but of course any file will do. When I'm following a file, I generally don't want to see anything other than what has been added due to the command or service I've executed. This keeps everything clean and tidy for troubleshooting.

Get own public IP address

Returns your external IP address to the command line using only wget

Speed up builds and scripts, remove duplicate entries in $PATH. Users scripts are oftern bad: PATH=/apath:$PATH type of thing cause diplicate.

Thanks to the authors of: $ awk '!x[$0]++' and the author of: $ joinargs() { (local IFS="$1"; shift && echo "$*") } and others, we can have a fast Linux or android. IMPORTANT if you find a priority order problem in PATH you can push a path directory to the front without duplication as follows: $ PATH=/bin:$PATH then ... Check duplication with: $ echo $PATH|tr : '\n'|sort|uniq -d Finally do a very neat line by line list of $PATH: $ echo "${PATH//:/$'\n'} The speed up is very noticeable for android, and builds on Linux Ubantu are much faster with make and scripts. I will update the command on request. Timothy from SONY

OSX command to take badly formatted xml from the clipboard, cleans it up and puts it back into the clipboard.

This command can be used with xclip or xsel for use on a linux box.

Using vim to save and run your python script.

This will save and execute your python script every time your press the F5 function key. It can also be added to your .vimrc: autocmd BufRead *.py nmap :w^M:!python % NOTE: the ^M is not just caret-M, it can be created by type: ctrl-v ctrl-m

List files

Shortcut to list files in the current path.

Send your terminfo to another machine

I frequently use this trick to send my terminal settings to HPUX and older RHEL systems. This is due to the fact that terminfo support for rxvt-unicode (my preferred terminal app) does not exist on many older Linux and Unices.

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

append empty line after every line in file.txt

Prints a file leaving out all blank lines and comment-only lines

Does not print any line that either: - is empty - contains only spaces or tabs - starts with # - starts with spaces/tabs followed by a #

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.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands tagged xxd

Commands tagged xxd (6) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands tagged xxd (6)

sorted by