useful.md

Undo an extract

unzip -l <<FILENAME>> |  awk 'BEGIN { OFS="" ; ORS="" } ; { for ( i=4; i<NF; i++ ) print $i " "; print $NF "\n" }' | xargs -I{} rm -v {}

Path of a file

readlink -e <<FILENAME>>

Burn Img to SD Card

dd bs=1M if=/path/to/MinePeon-2013-XX-XX.img of=/dev/sdX

Python Webserver

python -m SimpleHTTPServer
python3 -m http.server

Map full network fast

nmap -F 192.168.0.1/24

Filesize of folders

du -sk * | sort -n

List Hard Disks

fdisk -l

List DNS Nameserver being used

cat /etc/resolv.conf

Execute the command in a file

cat <<FILENAME>> | source /dev/stdin

Copy rsa to clipboard

xclip -sel clip < ~/.ssh/id_rsa.pub

Execute script on remote computer

cat /some/script | ssh user@server

Decrypt File given private key

gpg --allow-secret-key-import --import file-enc-privkey.asc
gpg -d config -o config.tar.gz
gunzip -c config.tar.gz | tar xopf -

SCP Directory

scp -rp sourcedirectory user@dest:/path

docker bridge ip change

docker daemon --bip 172.17.42.1/<subnet>

CTags to search for files

go to a project root using after installing ctags with apt install exuberant-ctags

ctags -R *

Which will creates a tags file listing all the definitions. Then you can search the tags in vim using

vim -t <tag>

A tag being the definition being searched for. This can also be achieved in vim itself using Ctrl-]

Hard disk space unix

ncdu

find largest directories

du --max-depth=1 /path | sort -r -k1,1n

Set default c++ compiler

sudo update-alternatives --config c++

Truncate syslog

truncate -s 0 /var/log/syslog

tar.gz a folder

Run tar command to create an archived named file.tar.gz for given directory name by running:

tar -czvf file.tar.gz directory

Check io speeds of disks

sudo hdparm -Tt /dev/sdX 

(for read/write) or

dd if=/dev/zero of=/tmp/output conv=fdatasync bs=384k count=1k; rm -f /tmp/output 

(for write (but even better if you do it on the same drive as the datadir, instead of /tmp))

Check what hard disks are mounted and where

sudo df -a -T -h