redirect – Keycode

Redirect build outputs to a file

make &> build.txt

All build outputs including warnings and errors will be redirected to build.txt. If without &, errors and warnings will not be redirected to the file.

2>/dev/null and 2>&1

Remove those entries that have an error of “Permission Denied” :

find /opt -name dcm 2>/dev/null

Filter the output of a program and redirect the filtered result into a file:

./bin/programA -i ... -o ... 2>&1 | grep "keywords" > a.txt