bash stuff

gistfile1.sh

cat | grep foo

{ cat aabsdf.xx 2>&1 ; } 2>/dev/null

# http://stackoverflow.com/questions/2342826/how-to-pipe-stderr-and-not-stdout?rq=1

# http://www.gnu.org/software/bash/manual/bashref.html#Redirections

# http://mywiki.wooledge.org/Redirection

{ ls ; cat ; } | grep foo

{ echo "foo" ; cat ; } | grep foo

# the right part of a pipe only receives the stdout of the left part

# swaps stdin and stdout!
command 3>&1 1>&2 2>&3