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Top Forums Shell Programming and Scripting redirect time command output to file (cygwin bash) Post 302671657 by alister on Saturday 14th of July 2012 12:11:02 AM
Old 07-14-2012
There were a few things regarding your redirection woes that piqued my curiosity. I believe I now understand why you've had so much trouble with it.

The syntax for a bash pipeline is as follows (from the bash manual):
Code:
The format for a pipeline is

     [time [-p]] [!] command1 [ [| or |&] command2 ...]

The reserved word time causes timing statistics to be printed for the pipeline once it finishes.

The key here is that time is a shell keyword, not a built-in and not an external command.


Quote:
Originally Posted by LMHmedchem
I have set up a bash script to run a long list of things that I need to time. I would like to redirect the output of time to a file.
Code:
<...snip...>
   time -a test_times.txt \
   ./myProgram.exe -a arguments -i inputFile -o outputFile

I get a bash error for -a: command not found.
Note that the error message says that -a is a command that cannot be found. It does not say that it's a bad option. Your script is using bash's time keyword, which does not support a -a or -o option, so that as far as bash is concerned, -a is the name of the command whose execution should be timed.

Quote:
Originally Posted by LMHmedchem
I have tried the following to get stderr appended to my output file,
Code:
   time ./servert.exe -n 4 -t 1000 -l 100 -d t -N $CPDS \
   -i  'test_ActiMol_'$SIZE'.sdf' \
   -o  'test_ActiMol_100K_'$CPDS'N_'$REP'.s' >>test_times.txt 2>&1

Code:
   time ./servert.exe -n 4 -t 1000 -l 100 -d t -N $CPDS \
   -i  'test_ActiMol_'$SIZE'.sdf' \
   -o  'test_ActiMol_100K_'$CPDS'N_'$REP'.s' 2>>test_times.txt

Code:
   time ./servert.exe -n 4 -t 1000 -l 100 -d t -N $CPDS \
   -i  'test_ActiMol_'$SIZE'.sdf' \
   -o  'test_ActiMol_100K_'$CPDS'N_'$REP'.s' &>>test_times.txt

the third one being a shot in the dark. None of these make any difference and I am still getting the time data printed to the terminal.

There always seems to be a hangup somewhere.
Indeed. With a command, the first two redirection attempts would have worked. However, since time is a keyword, there is nothing to redirect. The time keyword simply instructs bash to output timing info to its own standard error. If you want to redirect the timing information, you have to modify the current shell environment with exec prior to invoking the timed pipeline...

Quote:
Originally Posted by LMHmedchem
This was fixed by grouping the time and servert.exe commands,
Code:
   ( time ./servert.exe -n 4 -t 1000 -l 100 -d t -N $CPDS \
     -i  'test_ActiMol_'$SIZE'.sdf' \
     -o  'test_ActiMol_100K_'$CPDS'N_'$REP'.s' ) >> test_times.txt 2>&1

with this revision, the output is as expected,
[code]
... or you can run it in a subshell as you did there.

If you want to run the time command that supports the options you were initially attempting to use, you'll need to bypass the keyword using command time ./servert.exe ... or tell bash where to find the time binary, e.g., /usr/bin/time ./servert.exe ....

Regards,
Alister
This User Gave Thanks to alister For This Post:
 

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