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

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set my system date & time via terminal

I don't why a + sign appears in the my program: <ns1:ST>2015-05-23T18:00:00+04:00</ns1:ST> <ns1:ET>2015-05-23T18:15:00+04:00</ns1:ET> this is when I run the program in my ...
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5answers
647 views

How to get system time with microsecond Resolution

I want to know current system time with microsecond Resolution. date +%s returns Time in seconds since epoch(1-1-1970). How can I get time in microseconds Resolution. How much delay is in querying ...
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23 views

Run Loop between starttime and endtime and get data from url

I want to check two conduction and run a loop for every one minute. There should be three variable start_time, end_time and current_time Conduction's: start_time should be greater than ...
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0answers
15 views

Where does missing `time` go? [duplicate]

I ran the time command on one of my scripts, and this was the result: real 0m2.736s user 0m2.014s sys 0m0.228s If I add up user and sys, it's 2.242, which is 0.494 different from the real ...
2
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1answer
124 views

bash time with nohup

I want to know how much time it takes to run something in nohup. I know this works: $ time sleep 2 real 0m2.001s user 0m0.000s sys 0m0.001s But why it doesn't work with nohup? $ nohup ...
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2answers
62 views

Force time to stay put

The time on my Linux machine will not stay put. I need to test an issue with our server that only occurs on Saturdays. CentOS 6.5 64-bit I have NTPD off. (service ntpd stop and chkconfig ntpd off) ...
3
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0answers
32 views

Linux Mint system clock is days ahead after an overnight laptop suspend

I'm a long-time Ubuntu user, who recently started trying out Linux Mint on a laptop. This is not a dual-boot setup, Mint is the only OS on the machine. When I suspend the laptop (i.e. close the ...
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1answer
72 views

Unpacking of initramfs is very slow

I am trying to improve the kernel boot time of my device and I would like some help. I am using OMAPL138 with kernel version 2.6.37 and it takes about 50 seconds until the boot process is finished, ...
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3answers
45 views

Can system time be paused?

This may or may not be the right approach, but it's feasibility was requested of me: We have a demo server that we update from time to time in order to keep the statistical calculations up-to-date. ...
3
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5answers
109 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
57 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 ...
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1answer
15 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?
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36 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
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1answer
116 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
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4answers
547 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
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4answers
167 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
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3answers
175 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 ...
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39 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 ...
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35 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
26 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
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2answers
132 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 ...
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75 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 ...
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2answers
186 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 ...
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158 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 ...
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268 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 ...
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78 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
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1answer
57 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 ...
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43 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 ...
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1answer
78 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
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1answer
45 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
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1answer
67 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
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1answer
131 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 ...
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1answer
354 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 ...
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2answers
68 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
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1answer
202 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 ...
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2answers
161 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 ...
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1answer
974 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
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1answer
1k 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
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1answer
65 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
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1answer
208 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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56 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 ...
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1answer
80 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
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1answer
320 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
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5answers
1k 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
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1answer
885 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
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2answers
148 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; ...
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1answer
146 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
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1answer
308 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
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1answer
134 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
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2answers
179 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 ...