I am creating a basic script in which I would like to get the runtime of a program each time it is called in the script.
#!/bin/bash
for i in {1..15}
do
echo "Execucao $i"
time ./meu_programa > resultados_nesse_arquivo.txt
done
But when I run this script, I get only the standard output from my program, how can I get a similar result like:
Execucao X
real 0m0,001s
user 0m0,001s
sys 0m0,000s
This is because time sends the result to stderr instead of stdout by default.
You just need to redirect the output.
Example:
#!/bin/bash
outfile="benchmark.txt"
for i in $(seq 1 15)
do
echo "Execução: $i" >> $outfile
echo "-----------------" >> $outfile
(time cat arquivo.txt) >> $outfile 2>&1
echo "" >> $outfile
done
Output file:
Execução: 1
-----------------
teste1
teste2
real 0m0,003s
user 0m0,003s
sys 0m0,000s
Execução: 2
-----------------
teste1
teste2
real 0m0,003s
user 0m0,004s
sys 0m0,000s
Execução: 3
-----------------
teste1
teste2
real 0m0,003s
user 0m0,003s
sys 0m0,000s
...