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Shell Programming and Scripting

Time Utility

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# 1  
Old 12-06-2014
Time Utility
I am looking at some practice problems from a book involving the time utility and I am a little confused on what to do. Here is what it is telling me to do:

-Compile your sort:
gcc -o sort1 sort1.c quicksort.c
-For each input file, ins.n0000, get the time to execute:
time sort1 < file > /dev/null
-I would use the reported user time

This is what I did and got:

Code:
$ gcc -o sort1 sort1.c quicksort.c
$ time sort1 < sort1.c > /dev/null
No command 'sort1' found, did you mean:
 Command 'sort' from package 'coreutils' (main)
 Command 'sortm' from package 'nmh' (universe)
 Command 'sortm' from package 'mailutils-mh' (universe)
sort1: command not found

real    0m0.140s
user    0m0.100s
sys     0m0.028s
$ time sort1 < quicksort.c > /dev/null
No command 'sort1' found, did you mean:
 Command 'sort' from package 'coreutils' (main)
 Command 'sortm' from package 'nmh' (universe)
 Command 'sortm' from package 'mailutils-mh' (universe)
sort1: command not found

real    0m0.153s
user    0m0.112s
sys     0m0.028s

I have the two files and I am not sure what they mean by use the reported user time.
# 2  
Old 12-06-2014
Is . in your setting of $PATH?
If not, did you try:
Code:
$ time ./sort1 < sort1.c > /dev/null

This User Gave Thanks to Don Cragun For This Post:
totoro125
# 3  
Old 12-06-2014
First, make sure sort1 is executable.

Then try $ time ./sort1 (full path to sort1)
Bash is not finding the new sort1 because it is not in your PATH.

Edit: Oops
Sorry Don Cragun. Didn't see your post in time.
Last edited by ongoto; 12-06-2014 at 11:05 PM.. Reason: posted too late...
This User Gave Thanks to ongoto For This Post:
totoro125
# 4  
Old 12-06-2014
Thank you guys! It worked!
# 5  
Old 12-06-2014
Quote:
Originally Posted by totoro125
I am not sure what they mean by use the reported user time.
Quote:
Originally Posted by totoro125
Code:
real    0m0.140s
user    0m0.100s
sys     0m0.028s

# 6  
Old 12-07-2014
I am getting an error again, I trying to see how long it takes for different inputs so I compiled both.

Code:
$ gcc -o sort1 sort1.c quicksort.c
$ time sort1 < ins.n1000 > /dev/null
-bash: ins.n1000: No such file or directory

real    0m0.003s
user    0m0.000s
sys     0m0.000s
$ time ./sort1 < ./ins.n1000 > /dev/null
-bash: ./ins.n1000: No such file or directory

real    0m0.003s
user    0m0.000s
sys     0m0.000s

# 7  
Old 12-07-2014
If you want to know how long it will take to sort a file named ins.n1000, you actually have to have a file named ins.n1000 to sort.

To get rid of these error messages create a file named ins.n1000 in the directory where you are running sort1. Isn't this obvious from the bash diagnostics?
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