VivienGiraud/useful_cmd.md

## useful_cmd.md

      
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    OSX


Recursively Remove .DS_Store Files on Mac OS X

find . -name ‘*.DS_Store’ -type f -delete  
Generate random mac address and set it

sudo ifconfig en0 ether $(perl -e 'for ($i=0;$i<5;$i++){@m[$i]=int(rand(256));} printf "02:%X:%X:%X:%X:%X\n",@m;') && sudo ifconfig en0 down && sudo ifconfig en0 up
Get list of huge files

mdfind 'kMDItemFSSize>=1e8&&kMDItemContentTypeTree!=public.directory' | while IFS= read -r l; do stat -f'%z %N' "$l"; done | sort -rn  

AWS  

S3


Sync folder with public read right (perfect for a website)

aws s3 sync . s3://my-bucket/path --acl public-read
Get first 200Mb of a file in a S3 buck

aws s3api get-object --bucket bucket_name --key file_name_from_bucket.csv file_name_to_your_computer.csv --range bytes=0-200000000

EC2


Add 1GB of swap

sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
sudo /sbin/mkswap /var/swap.1
sudo chmod 600 /var/swap.1
sudo /sbin/swapon /var/swap.1

cat '/var/swap.1   swap    swap    defaults        0   0' >> /etc/fstab

Aliases

alias tasks='grep --color --exclude-dir={.git,DerivedData,Pods} -rEI "TODO|FIXME" . 2>/dev/null'
alias hdump='hexdump -v -e '\''"%010_ad  |" 16/1 "%_p" "|\n"'\'''  
alias my_ip='wget http://ipinfo.io/ip -qO -'  
CLI


Removing duplicates (and sorting it) without touching to CSV header

awk 'NR<1;!seen[$0]++' file