`time` is a command line utility for running another program and summarizing resource usage

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3
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82 views

Get PID of process started by time

Say I run time ./a.out, then I can get the PID of time by the variable $!. But how do I get the PID of a.out? Of course, I could parse the output of ps, but I want a more elegant solution. I've ...
2
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2answers
40 views

Best way of keeping clock accurate in LInux

I have researched many different of ways to accurately keep time in Linux, but there are so many programs and ways of doing it. I would like to know what you guys think is the best way to keep the ...
1
vote
1answer
14 views

Both time `rsync` and get its exit value?

If I want to time the running of rsync by time rsync -a /media/t/1/ ./, after it finishes, does $? report the exit value for time not for rsync? How can I both time rsync and get its exit value?
0
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1answer
29 views

Understand the big difference between real and usr+sys time used by rsync?

I started running rsync in three programs at the same time to transfer data between my external hard drive and my internal one. When they finished, I have their timing results: $ time rsync -a ...
6
votes
1answer
78 views

stat: print time in “long-iso” format

For my script, I would like to have stat command to print time in a nice, human friendly, way: 2015-02-04 00:48:31. ls calls this format long-iso and it can be used like this: $ ls -lA ...
8
votes
4answers
431 views

How can measure how long it takes my script to run AND include that in an email it generates?

I have a simple bash script that runs a series of checks (ping, nslookup, etc) and then sends an email report with the output of that data. I'd like the email to include information on how long it ...
3
votes
4answers
116 views

How to sum time using bash?

I want to know the total amount of time that a series of processes would take in my computer to decide if I should running there or in a stronger computer. So, i am forecasting the running time of ...
5
votes
3answers
140 views

How to measure Firefox's startup time?

I would like to measure how much time it takes for some softwares to start. I know the command time but in the case of firefox (iceweasel for me on Debian), this command prints only the time I let ...
0
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0answers
22 views

timedatectl not persisting time when set manually

Configuration before any attempts to modify it as per timedatectl: Then, I set the time manually timedatectl --adjust-system-clock set-time "2010-04-20 04:30:50": Nice, works! Now, I rerun ...
2
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0answers
25 views

Improve kernel boot time

I am using OMAPL138 and kernel version 2.6.37 and I would like to improve the boot time. By analyzing the kernel boot process I think it is taking a long time at MII PHY CONFIGURATION. The printscreen ...
0
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1answer
20 views

Many files in folder - time difference while accessing file with fullpath

Folder /var/log/something may have 1 file (test.log) in it or 1000000 different files (and test.log of course). Is there a time difference while accessing file test.log with realpath between those ...
4
votes
2answers
79 views

How long will NTP take to adjust the clock if it doesn't immediately set it?

I'm using SNTP to sync my Debian based system. SNTP has two ways to set the clock: -s, --settod Set (step) the time with settimeofday(). -j, --adjtime Set (slew) the time with adjtime(). The ...
1
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0answers
48 views

Variations in Ubuntu 12.04 /usr/bin/time statistics

I have a command line tool which I run on Ubuntu 12.04.5 LTS. I need to calculate the cpu time for this program. I have been checking /usr/bin/time function. command: /usr/bin/time -v -a -o ...
8
votes
2answers
170 views

How can I conditionally pass a subshell through 'time'?

I have a setup script for a Vagrant box where I used to measure single steps with time. Now I would like to conditionally enable or disable the time measurements. For example, previously a line would ...
0
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0answers
102 views

Get CPU time for Benchmark in Bash Script

I'm using this Method here: http://giantdorks.org/alain/how-to-benchmark-individual-shell-script-sections-to-identify-slow-parts/ to Benchmark my Bashscript: RuntimePrint() { duration=$(echo ...
0
votes
0answers
202 views

System CPU Time and User CPU Time Calculation for a Process in Linux

I want to calculate CPU time consumption of a particular process in system mode and user mode using statistics present in /proc/<PID>. There are two fields utime and stime in ...
4
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0answers
52 views

NTPD Nanokernel

I had a couple of questions about the NTP Nanokernel as explained here: http://www.eecis.udel.edu/~mills/database/brief/nano/nano.pdf The big question is how does this Nanokernel manage to deliver an ...
3
votes
1answer
53 views

Get the output of the time command

I have the following command time compare -metric rmse -subimage-search -dissimilarity-threshold 1 -similarity-threshold 0.99 $page \( -size 1x1 xc:black \) null: which produces the following ...
1
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1answer
39 views

To print execution time of Script from Script?

I'm searching PDF files in all directories except those in .texpadtmp by code originally based on this discussion. function findpdfs() { find . -iname '*.pdf' -not -path "*.texpadtmp*" | while read ...
1
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1answer
65 views

How can I use '-v' option in time command?

I read the man pages and the '-v' option(short for --verbose) is there and I'm sure this should work: time -v ls However, the output is: -v: Command not found. 0.000u 0.000s 0:00.00 0.0% ...
3
votes
1answer
37 views

Why does unbuffer command affect time command?

I noticed something odd when using the unbuffer command with time command. Here I just want to see how long takes to find a certain file in my system: time find . -name unixstuff output is : ...
4
votes
1answer
62 views

bash's builtin time accepts %E - what's going on?

The bash man page lists three and only three format codes recognized by the shell's builtin version of time: %R for the real time, %U for the time spent in userspace, and %S for time spent in system ...
3
votes
1answer
105 views

Why does the 'user' and 'sys' time vary on multiple executions?

There is a nice question and answer explaining the relationships between 'real', 'user' and 'sys'. It explains the reasons why 'real' can vary, and defines the 'user' and 'sys' as times the process ...
0
votes
1answer
187 views

How to move system clock time forward/backward?

I know commands for setting specific time and/or date, but can't find ones which move the time relative to the current time. What are the commands to move the time forward/backward x ...
1
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2answers
54 views

How can I count the time that needs systemd to boot a default target and then graph it?

When I wanted to know how long systemd actually needed to boot the default target, how would I do that ? An then, is it possible to create a graph to show which unit takes how much time to initialize ...
2
votes
1answer
147 views

system clock is off by one hour after every reboot

Every time I start my laptop, the clock is off by exactly one hour. I have to run ntpdate to fix it. Next time I restart the laptop, it will be off again. I have timezone set up correctly. I am ...
1
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2answers
141 views

Sending most recently created file via Email

I'm trying to send a log file every 24 hours or so via email. Currently I am using mutt for this. You can call mutt like this: mutt -s "Log" -a file_attachment example@example.com I know I can ...
0
votes
1answer
746 views

Writing a Bash script to run and end at specific times

I'd like to create a script that will do the following. Start at a given time during the day and end at another given time. So for example, I have a program I'd like to test, so my script would be ...
3
votes
1answer
838 views

Find last shutdown time

This is the command I am using: last -x|grep shutdown | head -1 but it's giving me the duration with +2 hours: shutdown system down 3.14-1-amd64 Mon Jul 21 08:43 - 22:19 (13:36) the last ...
2
votes
1answer
59 views

How can I tell when a file was compressed?

I want to find out when my log files were compressed by logrotate because when I received them from cron in my email, the logs came in as text in the main body of the email instead. I did: ls -1la ...
3
votes
1answer
155 views

redirect output for a command that takes in multiple arguments

this command is to redirect output of time to with multiple args: $ time wc test >wc.out 2>time.out unix programming environment book shows that the error output of time redirects to ...
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0answers
52 views

How does an X86 Linux system maintain the system time, when no NTP etc. is in play?

When an x86 Linux system is powered up and running, how does it keep track of software time? E.g. is it incrementing a software counter based on hardware interrupts from the RTC, or is there some ...
1
vote
1answer
75 views

define own time in linux

how to set time in linux in that way: 1 second define as 10 seconds (10 second = 1 secods of own time) I want fool all processes runned there to use 10x faster time. so sleep(1) will last 0.1 real ...
0
votes
1answer
215 views

What's the difference between modification date and inode's modification date?

I've just found some interesting information for me in man stat: a, m, c, B The time file was last accessed or modified, of when the inode was last changed, or the birth time of the inode. But ...
2
votes
5answers
951 views

Listing files greater than particular timestamp in file name?

I have a directory in linux which has a list of log files where log files get auto generated if some job runs. Each log file gets appended with the timestamp like "JobName_TimeStamp" UPDATED: ...
2
votes
1answer
641 views

Obtain user and kernel time of a running process?

Is there way to determine using standard Linux/Unix tools how much a process has spent in User mode and how much waiting for kernel? In other words, exactly the "user" and "sys" values that you get ...
2
votes
2answers
136 views

Will I be prompted for the sudo password a second time?

This is what I plan to do: #!/bin/bash sudo -i <<'EOF' iptables-save | awk '/^[*]/ { print $1 } /^:[A-Z]+ [^-]/ { print $1 " ACCEPT" ; } /COMMIT/ { print $0; ...
0
votes
1answer
107 views

What is “system time” when using “time” in command line

Im using time to time a Perl script on standard terminal in Ubuntu 14.04. I have read that real time is stopwatch time; the time I, as a user, is spending looking at the program running from I start ...
4
votes
1answer
248 views

How can I get the wall clock time of a running process?

I started a hash check of a large file and don't want to restart it using time. How can I get the wall clock time without using time at the beginning or using date right before I invoke a command?
1
vote
1answer
112 views

How to know my server's time offset? [duplicate]

I have a few guest machines on VMware. Up until now I was keeping my time sync with ntpd inside guests. Now our VMware admins decided to setup VM hosts to keep time, so VMs don't have to. I disabled ...
3
votes
2answers
148 views

Redirect the output of a command in `time command`

I am trying to time something using: /usr/bin/time myCommand However, since /usr/bin/time writes to stderr, if myCommand also writes to stderr, I will get more than just time's output on the ...
2
votes
1answer
42 views

convert to epoch and back

I've used the following two perl command lines successfully: perl -e 'use Time::Local; print timelocal(7,51,10,22,3,2014), "\n";' which returns 1398163867, and perl -e 'print ...
3
votes
2answers
283 views

How to record the actual running time of a program with other programs running? [duplicate]

When timing the wall time performance of an OpenMP program on Linux while other programs are running, how can I get the actual running time?
4
votes
3answers
2k views

Disable daylight saving time in Debian Linux

I do not want my system to use daylight saving time. root@ali-debserver:~# cat /etc/timezone Asia/Tehran root@ali-debserver:~# cat /etc/default/rcS # # /etc/default/rcS # # Default settings for the ...
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vote
2answers
89 views

Why my tabs are not expanding in TIMEFORMAT?

I need to measure the running time of an application, so I'm messing with TIMEFORMAT in order to print short format with the maximum precision available. From the Bash Refence Manual: TIMEFORMAT ...
15
votes
2answers
599 views

Is there something like `time` that also records I/O and CPU?

I can pretty quickly monitor the running time of a process with time: x@y ~ $ time foo real 0m14.299s user 0m4.770s sys 0m0.440s Is there a way I can get the same data for ...
4
votes
1answer
198 views

When was file created [duplicate]

How can i see when a file was created. I have looked at man page ls -lc is for last modification of file status ls -lu for access time ls -l not exactly indicated which time, last changed? I ...
2
votes
1answer
283 views

How to do an automated measurement for the boot time for freshly build images?

I want to generate images for an embedded system and automatically measure the time they took for booting (especially for different systems). I'm using Buildroot to generate my Linux Images. I ...
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0answers
79 views

Changing file time using touch

Im trying to change the file time of a m#merge the files to a temporary file. mergecap -w "${dir_dcn}"/merge_dcn.pcap "${FILES_dcn[@]}" touch -r "${FILES_dcn[14]}" dcn_file ls -l dcn_file ...
3
votes
2answers
224 views

Time running a Ruby script is different locally than over SSH

Has anyone else seen this behavior? I created a simple Ruby script for giggles to see how fast it would count up on a couple machines I have. Here's the source: for n in 1...1000000 do ...