Just a little question about timing programs on Linux: the time command allows to measure the execution time of a program:
[ed@lbox200 ~]$ time sleep 1
real 0m1.004s
user 0m0.000s
sys 0m0.004s
Which works fine. But if I try to redirect the output to a file, it fails.
[ed@lbox200 ~]$ time sleep 1 > time.txt
real 0m1.004s
user 0m0.001s
sys 0m0.004s
[ed@lbox200 ~]$ cat time.txt
[ed@lbox200 ~]$
I know there are other implementations of time with the option -o to write a file but my question is about the command without those options.
Any suggestions ?
Try
{ time sleep 1 ; } 2> time.txt
which combines the STDERR of "time" and your command into time.txt
Or use
{ time sleep 1 2> sleep.stderr ; } 2> time.txt
which puts STDERR from "sleep" into the file "sleep.stderr" and only STDERR from "time" goes into "time.txt"