Gists

I always forget how to do this kind of stuff.

• Create a text file of size N (around 20 MB)

  yes hello | head -c 20000000 > sample.txt
  

• psql enhancements

  \set PROMPT1 '%[%033[1m%]%M %n@%/%R%[%033[0m%]%x%# '
  \set PROMPT2 '[more] %R > '
  \pset null '[NULL]'
  \x auto
  \set VERBOSITY verbose
  \set HISTFILE ~/.psql_history- :DBNAME
  \set HISTCONTROL ignoredups
  \set COMP_KEYWORD_CASE upper
  

• GPG (symmetric) decryption (echoing password)

  $ echo $key | gpg --batch --yes --passphrase-fd 0 --output $1.plain --decrypt $1
  

• Base64 encoding

  $ echo -n 'my-string' | base64
  

• Show octal file permissions

  $ stat -c '%a' ~/.ssh/authorized_keys
  

• Create parent directories as needed

  $ mkdir -p env/roles/nginx/{tasks,handlers,defaults}
  

• Search for strings in git history excluding certain files

  git log -S "private-key" -p -- . ':(exclude)*.html*' ':(exclude)*.js*'