diff --git a/env.sh b/env.sh
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+# to be sourced, it allows to run C programs with libraries in ../lib.
+export LD_LIBRARY_PATH=../lib
+
+# to get the same output than the default (Makefile) one.
+# usage:
+# TIME command < inputfile
+alias TIME='\time -f "\ttime: %E real, %U user, %S sys\n\tcontext-switch:\t%c+%w, page-faults: %F+%R\n"'