1) http://mywiki.wooledge.org/BashFAQ/055
2) http://mywiki.wooledge.org/BashGuide/InputAndOutput#Redirection
3) http://stackoverflow.com/questions/818255/in-the-bash-shell-what-is-21
2) http://mywiki.wooledge.org/BashGuide/InputAndOutput#Redirection
3) http://stackoverflow.com/questions/818255/in-the-bash-shell-what-is-21
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