README.md

bash: improve your command line & script productivity

output redirection

file descriptor	number
stdin	0
stdout	1
stderr	2

./script.sh 2> err.log > out.log

./script.sh &> outAndErr.log

./script.sh |& tee outAndErr.log # and still shown on the console

./script.sh 2> /dev/null | grep outPattern # stderr is suppressed

./script.sh |& grep outAndErrPattern

• https://www.tldp.org/LDP/abs/html/io-redirection.html