redirect time command output to file (cygwin bash)
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. I have set it up like,
I get a bash error for -a: command not found.
Am I doing something wrong here??? I thought that time -a filename would append to the file.
First off, don't give a filename after -a, since one isn't expected there. -a tells it to append, but you still need -o to tell it which file.
Second, you don't need to open the same file 300 times to put 300 things in it. Try this:
Thanks for the help, I always learn something new here.
I added a few things to the code you posted,
and this runs without error, but the the time data is still to cout and does not end up in the file. Everything else ends up in test_times.txt as expected.
I will probably end up with a double loop on SIZE and CPDS, but I need to get the single instance working first. I tried adding the same -o filename after the time command, but I still get the -o: command not found error.
This is the ugly triple loop that I set up to run this long batch,
This works in every respect other than printing the output of time to the file. I am very unclear as to how to utilize the here-document in this context.
This is giving me the output I need,
minus the times.
LMHmedchem
---------- Post updated at 08:44 PM ---------- Previous update was at 08:27 PM ----------
Quote:
Originally Posted by alister
time output is printed on the standard error, which hasn't been redirected.
Regards,
Alister
I have tried the following to get stderr appended to my output file,
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.
LMHmedchem
---------- Post updated at 09:13 PM ---------- Previous update was at 08:44 PM ----------
Apparently, but using the following command,
I am redirecting the stderr and stdout of servert.exe to test_times.txt and not the stderr/stdout of time. This was fixed by grouping the time and servert.exe commands,
with this revision, the output is as expected,
now I think I need to try to incorporate the here-document suggested by Corona688 to minimize the number of echo commands.
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):
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.
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,
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,
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 ....
You are right that I mistakenly thought I was running the gnu time program when I was really using the bash time argument. Am I right in guessing that this reports the time it takes the bash command to execute and not the time it takes the program to run, or is there a difference?
GNU time gives more detailed output, such a page faults, etc. I thought I tried /usr/bin/time at some point, but that didn't work. I will have to give that a try and see if I can get it working. Which says that it's there. One of the issues I as thinking of is that the log file already exists, so I would want -a, but I didn't know if I could do -a without first having used -o to create the file.
This is the current version of the script,
It seems as if some of the multiple echo statements could be reduced using the here-document that Corona688 suggested. I will look into that. It also seems that I could echo a couple of newlines at once instead of doing it several times to insert several blank lines.
(/home/user1)-> more script.sh
#!/bin/ksh
( echo open devicename
sleep 3;
echo user;
sleep 2;
echo password;
sleep 2;
echo "/info/dump"; ---------> This needs to redirect to a file .Can be number of pages
sleep 2;
echo "exit" ) | telnet
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