micmarty / useful-commands

My personal list of commands I've needed somewhere in the past, no need to remember, now I can look up here and I'm done

Usefull commands by miczi

Rails:

1. Revert your DB to some state from the past

	rake db:migrate:status
	rake db:migrate VERSION=<migration_id_here>

2. RVM clean unnecessary gemsets(can take a lot of disk space, but provides separation in the environment)

	rvm gemset list
	rvm gemset delete <gemset_name_here>

Bash:

1. Search recursively for a phrase in each file at given path

	grep -r "<phrase_here>" .

2. Open all pdfs which contains given phrase

# first install pdfgrep (available in package manager, for sure: apt)
# secondly install evince (also in pm) - it's a pdf viewer appliaction
# Explanation: 
# 1. look for all occurences in given folder
# 2. split the output into columns, where whe treat : as a separator
# 3. take 1st column and redirect the output(pdf names) to evince, which is pdf program
evince $(pdfgrep <regex/phrase in double quotes> * | cut -d: -f1) 

3. Aliases for docker-compose with Rails(paste it inside your .bashrc or zshconfi

# up with cleared runngin server flag
alias duc="rm tmp/pids/server.pid; docker compose up"
alias deb="docker-compose exec app bash"

4. Remove n random files from directory

N=10
FROM=<some path>
rm $(ls $FROM | shuf -n $N)