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Unix

Archive​

KindCompressionExtraction
tar-czvf ARCHIVE.tar.gz FILE_OR_FOLDER-xzvf TAR_FILE -C OUT_PATH
gzipFILE
zipARCHIVE.zip FILE or -r ARCHIVE.zip PATTERN

Recipes​

# compress each file as gzip
for i in */*.jl; do echo "$i" && gzip "$i"; done

## as zip
$ for i in *.csv; do zip `basename $i .csv`.zip $i; done

# compress each folder
for i in *; do zip -r `basename $i`.cbz $i; done

bash​

# loop
for file in *.txt; do cat $file; done

# if-else
if [ $(whoami) = 'root' ]; then
    echo "You are root"
else
    echo "You are not root"
fi

# split file
split -l 300 file.txt new
split -b 500m httpd.log

# replace string  in text file
sed -i 's/old-text/new-text/g' input.txt

## osx
sed -i .bak 's/old-text/new-text/g' input.txt

# send grep output to mv
grep -l 'Subject: \[SPAM\]' | xargs -I '{}' mv '{}' DIR

Mount & Umount​

$ apt install ntfs-3g

## https://gist.github.com/etes/aa76a6e9c80579872e5f
sudo blkid # find devices
mkdir /mnt/volume
sudo chmod 770 /mnt/volume # set permission for mount point
sudo mount /dev/sda1 /mnt/volume

# Auto mount at boot
sudo nano /etc/fstab
UUID=D424912B2491119A /mnt/media FILE_SYSTEM uid=1000,gid=1000,nofail,umask=0 0 0

rsync​

# copy with progress bar
rsync -ah --progress source-file destination-file

# move files
--remove-source-files

SSH​

# create SSH key
ssh-keygen -b 2048 -t rsa

# SSH config
Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_rsa

# disable password auth
$ sudo nano /etc/ssh/sshd_config
## change this line
PasswordAuthentication no
## restart
$ sudo /etc/init.d/ssh restart

# port forwarding
ssh -L 5000:targethost:5000 NAME@TUNNEL_HOST

wget​

# download from file
wget -i links.txt

# recursive crawl
wget --recursive --no-parent -w 3 --random-wait -c -i urls.txt

System​

# kill all task containing a name
pkill -9

# see killed processes
dmesg

# kill all processes
killall python3

# check internet speed via terminal
curl -s https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py | python -

# set maximum storage for logs
https://www.digitalocean.com/community/tutorials/how-to-use-journalctl-to-view-and-manipulate-systemd-logs

# disable network interface
sudo ifconfig wlan0 down