Commands tagged bash

Delete a range of line

For example

will print

Deletes lines from START to END, inclusive. For example +4,10d will delete line 4, 5, ..., 10. Just like the vi command :4,10d does it.

Deletes lines to of a file. You must put the end line first in the range for the curly brace expansion, otherwise it will not work properly.

Search in decimal rather than hex. od dumps the character list, cut to remove offsets, sort -u gives the used characters. seq gives the comparison list, but we need this sorted alphabetically for comm, which does the filtering. I drop to perl to convert back to characters (is there a better way?) and then use od to dump them in a print-safe format.

Allow to launch nc like a daemon, in background until you still stop it.

(like this command: http://www.commandlinefu.com/commands/view/9978 )

For send script or commands from the client to the server, use nc too, like that :

cat script.sh | nc server 1025

echo "service openvpn restart" | nc server 1025

The loop's inside doesn't do anything, but we can add echo -e "\nCommand received\n" .

You can use ordinary printf to convert "%23%21%2fbin%2fbash" into "#!/bin/bash" with no external utilities, by using a little known printf feature -- the "%b" specifier converts shell escapes. Replace % with \x and printf will understand the urlencoded string.

BASH's printf has an extension to set a variable directly, too. So you get to convert urlencoded strings from garble to plaintext in one step with no externals and no backticks.

full command:

this assumes that all comics are saved as xkcd-[number]-[title].{png|jpg}.

it will then download the title and alt-text, create pictures from them, and put everything together in a new png-file.

it's not perfect, but it worked for nearly all my comics.

it uses the xkcd-json-interface.

though it's poorly written, it doesn't completely break on http://xkcd.com/859/

Remove ANSI colors from stream or file

Demos figlet/toilet fonts in a configurable dir.

# put this in your .bashrc

mkgo (){

mkdir $1 && cd $1

}

Use the standard calculator bc to convert decimals to hex

background and disown, but with a proper one-line syntax

Bash can accept '0x' and '0' notation for hexidecimal and octal numbers, so you just have to output the values.

Schematics:

command [options] [paste your variable here] parameter

command [options] [paste entire column of variables here] parameter

...

(hard-code command "c" and parameter "e" according to your wishes: in example shown command = "cp -a" and parameter = "~")

Features:

- Quick exchange only variable part of a long command line

- Make variable part to be an entire column of data (i.e. file list)

- Full control while processing every single item

Hints:

Paste column of data from anywhere. I.e. utilize the Block Select Mode to drag, select and copy columns (In KDE Konsole with Ctrl+Alt pressed, or only Ctrl pressed in GNOME Terminal respectively).

Disadvantages:

You can paste only one single variable in a row. If there are more space separated variables in a row only first one will be processed, but you can arrange your variables in a column instead. To transpose rows to columns or vice versa look at Linux manual pages for 'cut' and 'paste'.

TODO:

- add edit mode to vary command "c" and parameter "e" on the fly

- add one edit mode more to handle every list item different

- add y/n/a (=All) instead of only y(=default)/n to allowed answers

Disclaimer:

The code is not optimized, only the basic idea is presented here. It's up to you to shorten code or extend the functionality.

Converts a number of bytes provided as input, to a human readable number.

Remove the dashes from a UUID using bash search and replace.