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30%
Script utilities in depth: grep, awk, and sed
30.11.2025
Home »  Archive  »  2011  »  Issue 4: Secure...  » 
© jirkaejc, 123RF.com
, appearing in alphabetical order but allowing intervening letters, you can use the search expression: "a.*e.*i.*o.*u" This would match lines 1, 2, and 3. If you want lines containing all five vowels in order
30%
Workshop: Container virtualization with LXC on Ubuntu 10.04
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© Tormod Rossavik, 123RF.com
and modifying the IP address in line 8. The line lxc-create -n guest -f /lxc/conf.guest Listing 3 Container Configuration: conf.guest 01 lxc.utsname = guest 02 lxc.tty = 4 03 lxc
30%
Verifying your configuration
05.02.2023
Home »  Archive  »  2023  »  Issue 73: Datab...  » 
Lead Image © Kritiya Sumpun, 123RF.com
wgossrvc Listing 4 setup_goss.sh Diff Additions 5a6 > GOSSVFLE='/lib/systemd/system/goss.service' 9,10c10,12 < sha256sum < tee --- > sha256sum > systemctl > tee 81a84
30%
I/O benchmarks with Fio
30.11.2025
Home »  Archive  »  2011  »  Issue 5: Pen Te...  » 
© Kheng Ho Toh, 123RF.com
creates a 256MB file in the current directory along with process for the job. This process reads complete file content in random order. Fio records the areas that have already been read and reads each area
30%
Managing virtual machines
30.11.2025
Home »  Archive  »  2012  »  Issue 09: Windo...  » 
© Igor Klimov, 123RF.com
filesystem, if so desired [5]: $ guestfish -N fs:ext3 When you call Guestfish with the new image, $ guestfish -a you are taken to a shell where you first need to enter run to toggle the system ... 9
30%
The fine art of allocating memory
30.11.2025
Home »  Archive  »  2012  »  Issue 10: Traff...  » 
); i+= 4096) newblock[i] = 'Y'; 12 printf("Allocated %d MB\n", allocation); 13 } 14 } Things are more interesting when memory is being used. Uncommenting line 11 does just that. The OOM
30%
Prepare, analyze, and visualize data with R
07.06.2019
Home »  Archive  »  2019  »  Issue 51: Self-...  » 
Lead Image © Buchachon Petthanya, 123RF.com
: > numbers <- c(1, 2, 3, 4, 5) The c() function – the c stands for "concatenate" – combines the individual elements listed in parentheses. An equals sign can be used as an alternative for assignments, in line
30%
Using a Bash script to mirror external monitors
10.06.2015
Home »  Archive  »  2015  »  Issue 27: Fault...  » 
Lead Image © bowie15, 123RF.com
to the first sed I know that here is only a SINGLE space 45 display_list="$(sed ':a;N;$!ba;s/\n / /g'<<<"$xrandr_current" | sed \ -n -e 's/^\([a-zA-Z0-9_-]\+\) connected.* \([0-9]\+\)mm.* \([0-9]\+\)mm
30%
Tuning loops – from loop unrolling to Duff's device
28.07.2025
Home »  Archive  »  2025  »  Issue 88: 5 Net...  » 
[i] + b[i]; } When the number of cycles is known at compile time, a loop can be fully unrolled: c[0] = a[0] + b[0]; c[1] = a[1] + b[1]; c[2] = a[2] + b[2]; c[3] = a[3] + b[3]; However, it remains
30%
Intruder Detection with tcpdump
28.11.2011
Home »  Articles  » 
 
is to put it in a filter: # tcpdump -n -s 1515 -c 5 -i eth1 tcp or udp or icmp This will catch only tcp , udp , or icmp . Tables 3 and 4 show you what you need to know to find all TCP packets with the SYN

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