Commands by dbr

Commands by dbr (4)

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sort lines by length

making it "sound" more "natural" language like -- additionally sorting the longest words alphabetically: this approach is using: * to get at all lines of input * post-"for" structure * short-circuit-or in sort: if the lengths are the same, then sort alphabetically otherwise don't even evaluate the right hand side of the or * -C sets all input and ouput channels to utf8
This is sample output - yours may be different.
3

perl -C -e 'print for sort { length $a <=> length $b or $a cmp $b } <>' < /usr/share/dict/words | tail

dbr · 2011-10-20 01:43:25 3
one-line log format for svn

dirrrty: use -p to chomp automatically, substitute all newlines away and then replace the "---" by a newline ? bingo! s/// => s/// is just a cooler way to write s///, s/// which is just the small brother of s///; s/// (comma is an operator!) have fun!
This is sample output - yours may be different.
0

svn log | perl -pe 's/\n//g => s/^-.*/\n/g'

dbr · 2011-10-20 01:20:52 0
Syntax Highlight your Perl code
This is sample output - yours may be different.
1

perl -mText::Highlight -E 'say Text::Highlight->new(ansi => 1)->highlight(Perl => do { local (@ARGV,$/) = shift; <> }) ' path/to/perl-file.pl

dbr · 2011-07-12 04:55:12 1
Find C/C++ source code comments

more idiomatic version of the same, using the flip-flop-operator; also printing lines with '//'-style comments
This is sample output - yours may be different.
0

perl -ne 'print if m{\Q/*\E}x .. m{\Q*/\E}x or m{\/\/}x' *.c

dbr · 2011-07-12 04:41:49 20

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Get current Xorg resolution via xrandr

Convert JSON to YAML

Convert JSON to YAML. Note that you'll need to have PyYaml installed.

List processes sorted by CPU usage

Resume an emerge, and keep all object files that are already built

For Gentoo: If you do not use this command, portage will fetch the source again, and rebuild the hole application from the top. This command make portage keep all files that ar allready built

Get the IP address of a machine. Just the IP, no junk.

Why use many different utilities all piped together, when you only need two?

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

list any Linux files without users or groups

suspicious/anomalous ownership may indicate system breach; should return no results

Label EXT2/EXT3 File System

Find which service was used by which port number

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

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Commands by dbr (4)

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