You can use time to find out he execution time of any command or script
Example:
1 2 3 4 5 6 | $ time ls 01 - Veera.Mp3 02 - Usure Pogudhey.Mp3 03 - Kodu Poatta.Mp3 04 - Kaattu Sirukki.Mp3 05 - Kalvare.Mp3 06 - Keda Kari.Mp3 real 0m0.004s user 0m0.000s sys 0m0.004s |
In the above example the time taken by the ls command is 0.004s
1 2 | $ date -d "last monday" Mon Jun 28 00:00:00 IST 2010 |
1 2 | $ date -d "last sunday" Sun Jun 27 00:00:00 IST 2010 |
1 2 | $ date -d "1 day ago" Fri Jul 2 14:58:42 IST 2010 |
1 2 | $ date -d "2 days" Mon Jul 5 14:59:02 IST 2010 |
1 2 | $ date -d "200 days" Wed Jan 19 14:59:07 IST 2011 |
1 2 | $ date -d "last saturday" +%d-%m-%Y 26-06-2010 |
1 2 | $ date -d "1 hour ago" Sat Jul 3 14:01:09 IST 2010 |
1 2 | $ date Sat Jul 3 15:01:11 IST 2010 |
This is one of the trick in copy command
Normally we take backup the file using the following syntax
cp <file_name.sh> <file_name.sh.bak>
you can use do the samething like this also…
1 | cp file_name.{sh,sh.bak} |
Apropos is the command which search the entire manual (man) page entries and its description.
what is the usage of this command ?
we can easily get the Linux commands using the search word.
example :
The below output is for the search word “network”
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | $ apropos network /etc/network/interfaces (5) [interfaces] - network interface configuration for ifup and ifdown aseqnet (1) - ALSA sequencer connectors over network avahi-autoipd (8) - IPv4LL network address configuration daemon bittorrent-downloader.bittorrent (1) - download files using a scatter-gather network btdownloadcurses (1) - download files using a scatter-gather network btdownloadcurses.bittorrent (1) - download files using a scatter-gather network btdownloadgui (1) - download files using a scatter-gather network btdownloadgui.bittorrent (1) - download files using a scatter-gather network btdownloadheadless (1) - download files using a scatter-gather network btdownloadheadless.bittorrent (1) - download files using a scatter-gather network ctstat (8) - unified linux network statistics dhclient-script (8) - DHCP client network configuration script display-tele (7) - Forwards the display over a network ifconfig (8) - configure a network interface ifdown (8) - take a network interface down ifup (8) - bring a network interface up interfaces (5) - network interface configuration for ifup and ifdown iwconfig (8) - configure a wireless network interface iwgetid (8) - Report ESSID, NWID or AP/Cell Address of wireless network iwpriv (8) - configure optionals (private) parameters of a wireless network interface jng (5) - JPEG Network Graphics (JNG) sub-format libmng (3) - Multiple-image Network Graphics (MNG) Reference Library 1.0.9 libpng (3) - Portable Network Graphics (PNG) Reference Library 1.2.27 lnstat (8) - unified linux network statistics mng (5) - Multiple-image Network Graphics (MNG) format mtr (8) - a network diagnostic tool nameif (8) - name network interfaces based on MAC addresses Net::Cmd (3perl) - Network Command class (as used by FTP, SMTP etc) Net::Time (3perl) - time and daytime network client interface netdevice (7) - Low level access to Linux network devices netstat (8) - Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships network-admin (1) - Network Administration Tool NetworkManager (8) - network management daemon networks (5) - network name information nm-tool (1) - utility to report NetworkManager state nm-vpn-properties (1) - Network management framework nmap (1) - Network exploration tool and security / port scanner nstat (8) - network statistics tools. pabrowse (1) - List PulseAudio sound servers on the network perlfaq9 (1) - Networking ($Revision: 8539 $) ping (8) - send ICMP ECHO_REQUEST to network hosts ping6 (8) - send ICMP ECHO_REQUEST to network hosts png (5) - Portable Network Graphics (PNG) format rtacct (8) - network statistics tools. rtstat (8) - unified linux network statistics sane-net (5) - SANE network backend saned (8) - SANE network daemon services (5) - Internet network services list slattach (8) - attach a network interface to a serial line smbtree (1) - A text based smb network browser tcpdump (8) - dump traffic on a network tracepath (8) - traces path to a network host discovering MTU along this path tracepath6 (8) - traces path to a network host discovering MTU along this path traceroute6 (8) - traces path to a network host traceroute6.iputils (8) - traces path to a network host wget (1) - The non-interactive network downloader. |
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